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CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Jiang Weixing, George Gravelle, Training Departmen...
Core Major Module
Purpose:
Provide the energy to drive the LPT
Components:
The core major module consists of eight mainten...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Core Major Module (Cont.)
HPT nozzle is a single stage, air-cooled assembly that mounts in the combustion case and directs...
Core Major Module – High Pressure Compressor
Compressor Section
The compressor section provides compressedair for combusti...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPC Rotor
HPC Rotor Description:
The HPC rotor is a 9 stage, high speed, unitizedspool-disk structure. The rotor consists ...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPC Rotor (cont.)
Number of rotor blades per Stage
Stage 1 – 38 blades
Stage 2 – 53 blades
Stage 3 – 60 blades
Stage 4 – 6...
HPC Rotor (cont.)
Rear Seal
The compressor rotor rear rotating (CDP) air seal is a one-piece nickel alloy forging with abr...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPC Front Stator Assembly
Description
Configuration one (Titanium Stator Case)
The front casing halves are a matchedset ma...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPC Front Stator Assembly Components (cont.)
Configuration two (steel stator case) (S/B 72-383)
The configuration two fron...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPC Front Stator Assembly Components
Stator contains IGV’s and five stator stages:
IGV’s 42 IGV’s
Stage 1 - 82 VSV’s
Stage...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPC Front Stator Assembly Components (cont.)
The fixed vanes, in stage 4 and 5, are fabricatedinto segments consisting of ...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPC Front Stator Assembly Components
Variable Vane Actuation
Actuation of the variable vanes is accomplished with hydrauli...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPC Front Stator Assembly Components (cont.)
Variable stator vane attachment assembly
Typical for stages 1 through 3 Typic...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPC Front Stator Assembly Components (cont.)
Stage 5 bleed manifold, fourteen segments boltedto the inner flange of the fo...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Fourteen (14) bracket segments
Core Major Module – Rear Stator Case
Description:
The rear stator assembly is locatedinside of the front stator assembly e...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Cantilever
support
Rear case rests on brackets
Core Major Module – Rear Stator Case (cont.)
Components:
Casing:
Casing halves (configuration one) Pre S/B 72-015
The rear...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Liners
Core Major Module – Rear Stator Case (cont.)
Description:
Post S/B 72-015
The rear casing quarters are a matched set machi...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Split Line
Core Major Module – Rear Stator Case (cont.)
Vanes
The stage 6,7 and8 stages vanes are manufacture in replaceable vane seg...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Core Major Module – combustion section
Purpose
The combustion section is a place to effectively blendand burn the fuel/air...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
High Pressure Turbine (HPT)
HPT Shroud Support and...
Core Major Module – Combustion Case
Description:
The combustion case is a fabricatedstructural weldment located between th...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Core Major Module – Combustion Chamber
Description:
The combustion chamber is a short, annular structure. The design of th...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Core Major Module – High Pressure Turbine Nozzle
Purpose:
Direct the combustion gasses onto the HPTR.
Description:
The hig...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Core Major Module – High Pressure Turbine Nozzle (cont.)
Components:
Nozzle segments
The HPT nozzle segments are assemblie...
Trailing
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPT Nozzle Segment
Core Major Module – High Pressure Turbine Nozzle (cont.)
Inner and Outer supports
The nozzle inner andouter supports are b...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Core Major Module – High Pressure Turbine Rotor
Description:
The high pressure turbine (HPT) rotor is a single-stage, air-...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Core Major Module –High Pressure Turbine rotor (cont.)
Front shaft
The front shaft forms the structural connection between...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Core Major Module – High Pressure Turbine Shroud and Stage 1 LPT Nozzle
Description:
The high pressure turbine (HPT) shrou...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
HPT Shroud and Stage 1 LPT Nozzle Support Assembly
Core Major Module – High Pressure Turbine Shroud and Stage 1 LPT Nozzle (cont.)
HPT Shrouds
The HPT shrouds have a smooth ...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
Core Major Module – High Pressure Turbine Shroud and Stage 1 LPT Nozzle (cont.)
Stage 1 LPT Nozzle Segments
The assembly h...
CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
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  1. 1. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd. Jiang Weixing, George Gravelle, Training Department/Human Resources Revision Date: Feb.20,2004
  2. 2. Core Major Module Purpose: Provide the energy to drive the LPT Components: The core major module consists of eight maintenance modules as follows: HPC rotor, HPC front stator, HPC rear stator, combustion case, combustion chamber, HPT nozzle, HPT rotor, HPT shroud and first stage LPT nozzle. Description: HPC rotor is a nine stage, high speed, unitizedspool-disk structure. The rotor consists of five major parts: the front shaft, the 1st and 2ndstage spool, the third stage disk, the 4th through 9th stage spool and the compressor rear (CDP) seal. HPC front stator, consists of: front casing halves, extension casing halves (configuration 1), IGV’s and first 5 stages of stator vanes. The IGV’s andthe 1st through 3rd stage vanes are variable, the 4th and 5th stage vanes are fixed. The HPC rear stator consists of: rear casing halves, liners (Configuration 1), three stages of fixed vanes, and vane shrouds. The rear stator is locatedinside the front stator extension andis cantilever-mountedto the rear stator support. The rear stator support outer flange is mounted between the compressor front stator extension and the combustion case. Combustion case is a fabricated structural weldment located between the HPC and the LPT. It provides structural interface, transmits engine axial loads, and provides gas flow path between the compressor and the LPT. Combustion chamber containedin the combustion case, consists of outer andinner cowls, 20 primary and 20 secondary swirl nozzles, dome, and outer and inner liners. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  3. 3. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  4. 4. Core Major Module (Cont.) HPT nozzle is a single stage, air-cooled assembly that mounts in the combustion case and directs the gas flow from the combustion chamber onto the blades of the HPT at the optimal angle. HPT rotor is a single stage, air-cooled turbine. Structurally, the rotor consists of the front shaft, the forward air seal, the disk, andthe rear shaft. The HPT rotor drives the HPC rotor andis directly connectedto it by a bolted flange to form what is essentially a single core rotor. HPT shroud and 1st stage LPT nozzle is locatedin the aft section of the combustion case. It forms the interface between the core section and the LPT module of the engine. The forwardflange of the assembly is rabbeted and boltedto the inner surfaces of the combustion casing. The aft flange is bolted between the combustion casing aft flange and the LPT stator forward flange. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  5. 5. Core Major Module – High Pressure Compressor Compressor Section The compressor section provides compressedair for combustion and bleed air from stages 5 and9 for engine and aircraft use. 5th stage air Is extracted through bleed manifoldsegments just aft of the stage 5 stator andis directedinto forward and aft air extraction manifolds. The forward manifold provides air for turbine clearance control and stage 1 LPT nozzle cooling. The aft manifold provides a bleed source for aircraft use. 9th stage air Is extracted through a gap between the rear stator case and combustion case (just aft of stage 9 rotor). Stage 9 manifold provides the aircraft with the high pressure source of bleed air. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  6. 6. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  7. 7. HPC Rotor HPC Rotor Description: The HPC rotor is a 9 stage, high speed, unitizedspool-disk structure. The rotor consists of five major components: - Front shaft, Stage 1-2 spool, Stage 3 disk, Stage 4-9 spool - HPC rear rotating (CDP) air seal HPC Rotor Components: Front shaft The front shaft is bolted between the stage 1 and 2 spool and the stage 3 disk, and is the forwardsupport for the rotor. The shaft is splined to and securedto the IGB horizontal bevel gear by a coupling nut. The IGB contains the thrust bearing (No. 3 ball bearing) for the core engine. The front shaft is made of a titanium alloy. Disk andSpools The stage 1 and2 spool and the stage 3 disk are made of titanium alloy forgings and retain the stages 1-3 blades in axial slots. The stages 4-9 spool is made of a nickel alloy and retains stages 4-9 blades in circumferential grooves. The disk andstages 4-9 spool are internally cooled by LPC booster discharge air which enters the rotor through holes in the front shaft. There are abrasive coatedseals between the rotor blade stages for improved compressor performance. Blades: The stages 1-3 blades are made of a titanium alloy. The stage 4-9 blades are made of a nickel alloy. The first three stages of blades are securedin the disk and spool axial slots by retaining rings; the blades in the stages 4-9 are securedin the circumferential grooves by locking lugs. All blades are replaceable without disassembling the rotor. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  8. 8. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  9. 9. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  10. 10. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  11. 11. HPC Rotor (cont.) Number of rotor blades per Stage Stage 1 – 38 blades Stage 2 – 53 blades Stage 3 – 60 blades Stage 4 – 68 blades Stage 5 – 75 blades Stage 6 – 82 blades Stage 7 – 82 blades Stage 8 – 80 blades Stage 9 – 76 blades CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  12. 12. HPC Rotor (cont.) Rear Seal The compressor rotor rear rotating (CDP) air seal is a one-piece nickel alloy forging with abrasive, protective- coatedsealing teeth. The seal is mounted to the aft flange of the stages 4-9 spool by a tight fitting rabbet diameter andis axially clamped by the bolts and nuts securing the forwardflange of the HPT rotor to the compressor. HPC Rotor Airflow An air duct through the inside diameter of the rotor forms a flow path for pressurizing and cooling air. Pressurizing air from the forwardsump flows between the air duct and LPT shaft. This air enters the aft sump through holes in the HPT aft shaft and pressurizes the aft sump seals. Cooling air from the No. 3 bearing aft stationary seal flows through holes in the compressor rotor front shaft through the compressor and HPT rotors andenters into the LPT rotor through holes in the aft shaft of the HPT. This airflowis referredto as bore rotor cavity cooling. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  13. 13. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  14. 14. HPC Front Stator Assembly Description Configuration one (Titanium Stator Case) The front casing halves are a matchedset machinedfrom a titanium forging. The extension casing halves are also a matched set and are machinedfrom an Inco 718 steel forging. The extension case attaches to the front case with bolts andnuts which must not removed. Segmentedliners make-up the stage 1-5 flow path. The front stator forms the load carrying structure between the fan frame and the combustion case. Bleedair is extractedfrom pads on the front case andextension for customer use, and for the HPT and LPT cooling. The stage 5 bleed manifolds have a controlledinside diameter that interfaces with the forwardend of the rear stator. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  15. 15. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  16. 16. HPC Front Stator Assembly Components (cont.) Configuration two (steel stator case) (S/B 72-383) The configuration two front case halves are made from an M152 steel forging. This forging replaces the titanium front case / Inco 718 extension case forgings. The stage 1-5 flow path is a machined, integral part of the case, instead of liners. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  17. 17. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  18. 18. HPC Front Stator Assembly Components Stator contains IGV’s and five stator stages: IGV’s 42 IGV’s Stage 1 - 82 VSV’s Stage 2 - 84 VSV’s Stage 3 - 72 VSV’s Stage 4 - 10 sectors of seven fixed vanes each Stage 5 - 12 sectors of seven fixed vanes each Stator vanes The IGV and stages 1-3 vanes are variable; the stages 4 and 5 vanes are fixed. All stages of variable vanes are shrouded. The IGV shrouds are made of an epoxy resin, and are in two 180 degree sections. Shrouds for stages 1, 2 and3 are made of aluminum and are in 12 segments. IGV inner shroud mates with No. 3 bearing aft stationary air/oil seal. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  19. 19. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  20. 20. HPC Front Stator Assembly Components (cont.) The fixed vanes, in stage 4 and 5, are fabricatedinto segments consisting of several vanes each. The fixed vanes have removable interstage honeycombshroudsegments attachedto their inner bands that interface with the labyrinth ribseals on the rotor spool diameter. Sector wear guides protect the vanes, liners (configuration 1) and casing from wear. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  21. 21. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  22. 22. HPC Front Stator Assembly Components Variable Vane Actuation Actuation of the variable vanes is accomplished with hydraulically actuated bell crank assemblies mounted on the front compressor stator at the 2 and8 o’clock positions. Adjustable linkages connects the bell cranks to actuation rings. Lever arms attachedto the variable vanes connect to the actuation rings. Fuel from MEC is usedto operate the hydraulic actuators. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  23. 23. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  24. 24. HPC Front Stator Assembly Components (cont.) Variable stator vane attachment assembly Typical for stages 1 through 3 Typical for IGV’s except inner trunnion bushing Bushings are installedfrom the outer side of the stator case VSV hole and on the inside of each VSV hole an inner washer provides sealing for the compressor air path. The interstage seal retains the shroud pins in addition to sealing the area between the vane inner diameter and compressor rotor. In the actuation rings, at stages 1-3, bushings are installedto interface with the lever arm of the VSV assembly. For the IGV variable stage, the attachment assembly is the same at the case, lever arm and actuation ring as for stages 1-3, but each IGV andinner trunnion bushing is assembledto the shroudsegments andheldin place with a retainer, or on some later designs, boltedto the forward shroudsegment. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  25. 25. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  26. 26. HPC Front Stator Assembly Components (cont.) Stage 5 bleed manifold, fourteen segments boltedto the inner flange of the forward aft compressor case, provides a flow path for the air extraction at the three large holes for customer 5th stage bleed (two in the upper half extension case at 12 and2:30 o’clock positions/ALF and one in the lower half extension case at the 8:30 o’clock position/ALF). A newconfiguration has replaced the fourteen segments with segments machined as an integral part of the case. The forward flange of the HPC rear case rests on these brackets. Extension case encloses rear stator case and contains threaded bosses at the 5 o’clock position/ALF for the outer portion of stage 6-8 borescope plugs. Borescope ports at all five stages plus IGV’s at approximately 5 0’clock position/ALF. Core engine major module dimensional data plate (5 o’clock ALF, attached to flange N) CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  27. 27. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd. Fourteen (14) bracket segments
  28. 28. Core Major Module – Rear Stator Case Description: The rear stator assembly is locatedinside of the front stator assembly extension andis cantilever mountedto the rear stator support. The rear stator support outer flange is mounted between the compressor front stator extension and the combustion case. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  29. 29. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd. Cantilever support Rear case rests on brackets
  30. 30. Core Major Module – Rear Stator Case (cont.) Components: Casing: Casing halves (configuration one) Pre S/B 72-015 The rear casing halves are a matched set machined from an inconel forging. The casings have internally machined circumferential slots that retain stage 6,7 and8 stator vane segments and stages 6, 7, 8 and9 liners. Liners Configuration one has replaceable liners between each stage of vanes. Liners provide a rubbing surface for the rotor blades. Configuration two is linerless. The rubcoating is applied directly to the casing lands. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  31. 31. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd. Liners
  32. 32. Core Major Module – Rear Stator Case (cont.) Description: Post S/B 72-015 The rear casing quarters are a matched set machined from inconel castings. The upper andlower halves are permanently bolted together at 12 o’clock and6 o’clock. The configuration two casings have internally machined circumferential slots that retain stages 6,7 and8 stator vane segments andstages 6,7,8 and9 Metco 450 coated rub lands. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  33. 33. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd. Split Line
  34. 34. Core Major Module – Rear Stator Case (cont.) Vanes The stage 6,7 and8 stages vanes are manufacture in replaceable vane segments. They have removable honeycomb seals that meet with the knife edge seals on the compressor rotor. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  35. 35. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  36. 36. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  37. 37. Core Major Module – combustion section Purpose The combustion section is a place to effectively blendand burn the fuel/air mixture at the proper ratio for top performance /efficiency of the engine. Components: The combustion case encloses the combustion chamber and high pressure turbine (HPT) components. The combustion chamber, compressor rear stationary (CDP) seal, HPT nozzle assembly, HPT Rotor and HPT shroud/stage 1 LPT nozzle assembly are mounted in andstructurally supported by the combustion case. The case mounts and positions the 20 fuel nozzles, two igniter plugs, and fuel manifold. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  38. 38. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  39. 39. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd. High Pressure Turbine (HPT) HPT Shroud Support and Stage 1 LPT Nozzle
  40. 40. Core Major Module – Combustion Case Description: The combustion case is a fabricatedstructural weldment located between the high pressure compressor (HPC) and the low pressure turbine (LPT). It provides the structural interface, transmits the engine axial load, and provides gas flow path between the compressor and LPT. The case incorporates the HPC outlet guide vanes (OGV) and a diffuser for the reduction of combustion chamber sensitivity to the compressor air velocity profile. There are six borescope ports: four for inspection of the combustion chamber and HPT nozzles, and two for inspection of the HPT blades, HPT shrouds andthe 1st stage LPT blades. The case has four ports for extraction of compressor discharge air for aircraft systems use, four ports for introduction of 5th stage compressor air for Stage 1 LPT cooling, and three ports for HPT shroudsupport cooling air for HPT Clearance Control . There is also one port for the CDP (PS3C) sensing tube which connects to the main engine control (MEC), two ports for spark igniters (4 and 8 o’clock positions) and20 ports for fuel nozzles. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  41. 41. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  42. 42. Core Major Module – Combustion Chamber Description: The combustion chamber is a short, annular structure. The design of the combustion chamber, along with the swirler nozzles, andhigh pressure/temperature air, produces fuel-air mixing to provide a uniform combustion pattern and low thermal stresses. The combustion chamber, containedin the combustion case, consists of outer andinner cowls, 20 primary swirl nozzles, dome, and outer and inner liners. The outer liner and inner cowl are either boltedor welded to the dome. The inner liner and inner cowl are bolted to the dome at a common joint. Components: Dome The dome consists of both cast and machined components. 20 primary swirl nozzles and20 secondary swirl nozzles with venturi’s andsleeves are usedto provide mixing of air and fuel. The entire surface of the dome is cooled by a film of air. Cowls The inner and outer cowls are designedto provide uniform andstable airflow profiles to the combustion chamber. Liners The outer andinner liners are of an integral design with panel overhangs which contain closely spaced holes for film cooling. Dilution holes are employed in the liners to provide additional mixing andcooling air which lowers the gas temperature at the turbine inlet. The outer liner contains two ferrules for the igniters. The Inner liner is bolted between the HPT nozzle and the HPT nozzle support. The out liner mates with the inner surface of the combustion case andis aligned by tabs. The aft end of the liners interface with the HPT through leaf seals. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  43. 43. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  44. 44. Core Major Module – High Pressure Turbine Nozzle Purpose: Direct the combustion gasses onto the HPTR. Description: The high pressure turbine (HPT) nozzle is a single-stage air cooled assembly that is mountedin the combustion case and directs the gas flow from the combustion chamber onto the blades of the HPT rotor at the optimal angle. The major parts of the nozzle are 23 nozzles segments, outer support, andinner support. The aft support and seal assembly and the aft stator seals, while not integral components of the HPT nozzle module are includedsince they attach to the HPT stator parts. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  45. 45. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  46. 46. Core Major Module – High Pressure Turbine Nozzle (cont.) Components: Nozzle segments The HPT nozzle segments are assemblies of 2 vanes brazedinto inner and outer platforms. Each vane is a cast shell dividedinto forwardand aft compartments by an inner rib. The vanes and platforms are cooled by compressor discharge air (CDP) entering the vane compartments through inserts in the inner andouter ends of vanes and exiting through the vane leading and trailing edges. The vanes and platforms are made of a high strength cobalt base alloy with a protective coating on the vane airfoils and on the platform flow path surfaces. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  47. 47. Trailing CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd. HPT Nozzle Segment
  48. 48. Core Major Module – High Pressure Turbine Nozzle (cont.) Inner and Outer supports The nozzle inner andouter supports are both one-piece nickel base alloy rings. The major portion of the nozzle axial loadis carried by the inner support through the bolted flanges of the support and nozzle inner platforms. The outer support carries a minor portion of the load. Aft outer support andseal The aft outer support is a one-piece nickel base alloy ring that provides support for the four-stephoneycomb seal that mates with the HPT rotor inducer seal to help maintain the proper amount of cooling air flow androtor thrust. Aft stator seals The aft stator seal segments form a seal ring which controls the amount of cooling air leakage that passed between the seal and the HPT blades. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  49. 49. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  50. 50. Core Major Module – High Pressure Turbine Rotor Description: The high pressure turbine (HPT) rotor is a single-stage, air-cooled, high efficiency turbine. The rotor consists of the front shaft, the front rotating air seal, the bladed disk, and the rear shaft. The HPT rotor drives the compressor rotor and is directly connected to it by a bolted flange to form what is essentially a single core rotor. The rotor is internally cooled by low pressure compressor (booster) discharge air. It has interference rabbeted flanges for rigidity and stability. The four main structural parts are made of high strength nickel alloys. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  51. 51. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  52. 52. Core Major Module –High Pressure Turbine rotor (cont.) Front shaft The front shaft forms the structural connection between the compressor rotor and the HPT rotor, andsupports the aft end of the compressor rotor. Disk The HPT disk is a forged and machined part that retains the turbine blades in axial dovetail slots. The inner part of the disk is cooled by booster discharge air. The outer part of the disk is cooled by compressor discharge air. Rear shaft The rear shaft is bolted to the aft side of the disk at a rabbetedflange and forms the aft support for the HPT rotor. The shaft is supported by the NO. 4 roller bearing which rides on the low pressure shaft. Repairable abrasive-coated seals are machined as an integral part of the rear shaft. Front rotating air seal The front rotating air seal is bolted between the disk and the front shaft of the rotor. It forms a cavity between itself and the disk to direct compressor discharge air against the disk weband out through the turbine blades. The seal is a labyrinth inclined tooth form that reduces leakage past the seals. The seal teeth are abrasive coated andrepairable. Blades The blades are made of a high temperature nickel alloy with a high strength to weight ratio. They are a single- shank design and are individually replaceable. The single-stage design allows for better air cooling andlower metal temperature. The blades are internally cooled by compressor discharge air entering through the blade root andexiting through holes in the leading edge tip, and trailing edge. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  53. 53. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  54. 54. Core Major Module – High Pressure Turbine Shroud and Stage 1 LPT Nozzle Description: The high pressure turbine (HPT) shroud andstage 1 low pressure turbine (LPT) nozzle assembly is locatedinside the aft end of the combustion case. It forms the interface between the core section and the LPT module. The forwardflange of the assembly is bolted to the inner surface of the combustion case. The aft flange is bolted between the combustion case aft flange and the LPT stator forwardflange. The shroud/nozzle support assembly has a thermal response (turbine clearance control) matchedto the rotor to provide optimum tipclearance control andstructural stability. An air cavity between the shroud/nozzle support assembly and the combustion case directs 5th and9th stage compressor bleed air onto the support. This cooling air maintains a closer clearance between the shrouds and the rotor blades. The stage 1 LPT nozzles direct the core engine exhaust gas onto the stage 1 LPT blades. An air cavity between the stage 1 nozzle support and the combustion case directs 5th compressor stage bleedair through the nozzle vanes for cooling. After passing through the vanes, the air pressurizes andcools the cavity between the aft side of the HPT rotor andthe forwardside of the LPT rotor. The assembly is bolted between the LPT case forward flange and the combustion case aft flange. Borescope ports at 5:30 and 8:30 o’clock are providedin the support to allowinspection of the nozzle area. Components: Shroud/nozzle support assembly The shroud/nozzle support assembly forms the outer shell of the assembly and provides an air space or manifold area between the outer shell andthe combustion case. High pressure compressor bleed air is introduced into the manifold area to provide cooling for the HPT shrouds andthe LPT nozzles. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  55. 55. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd. HPT Shroud and Stage 1 LPT Nozzle Support Assembly
  56. 56. Core Major Module – High Pressure Turbine Shroud and Stage 1 LPT Nozzle (cont.) HPT Shrouds The HPT shrouds have a smooth abrasive rub surface that is tolerant to localized blade tiprubs and has good resistance to erosion from hot exhaust gasses. The shrouds are heldin place on the support by retainers and are individually replaceable. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  57. 57. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  58. 58. Core Major Module – High Pressure Turbine Shroud and Stage 1 LPT Nozzle (cont.) Stage 1 LPT Nozzle Segments The assembly has 28 LPT nozzle segments, each having 3 vanes. The nozzle segments are installedin the shroud /nozzle support assembly and are held in place on the nozzle inner air seal by the stationary air seal which is bolted on the aft face of the inner air seal. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
  59. 59. CFM56-3 Familiarization Training Manual MTU Maintenance Zhuhai Co. Ltd.
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