83354809 04-combustion-si-ci

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83354809 04-combustion-si-ci

  1. 1. ME 323 : I.C Engines Combustion in I.C EnginesMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory MarchSlide 1 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 1
  2. 2. INTRODUCTIONMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory MarchSlide 2 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 2
  3. 3.  Combustion Conditions for combustion Ignition Limits Combustion Equations Stoichiometric Combustion Air requirement Composition of airMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory MarchSlide 3 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 3
  4. 4.  Air-fuel ratio Fuel-air ratio Relative air-fuel ratio Equivalence ratio Pre-mixed and Diffusion combustion Swirl/Squish/TurbulenceMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory MarchSlide 4 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 4
  5. 5. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory MarchSlide 5 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 5
  6. 6. For all calculation : O2 = 21% ; N2 = 79% and ratio of N2/O2 is 3.76 Average molecular mass of air is 28.967 or 29 kg/kmol.March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory MarchSlide 6 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 6
  7. 7. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory MarchSlide 7 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 7
  8. 8.  Swirl : The orderly motion of the air particularly almost parallel to the axis of the engine. Very much required for diesel engines. Squish/Squash : The radial inward motion of the air-fuel mixture towards (squish) and away from the axis of the engine (squash). Very much required for the gasoline engines. Turbulence : Random mixing of the burned and unburned gases very much required for both Otto and Diesel engines.March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory MarchSlide 8 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 8
  9. 9. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory MarchSlide 9 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 9
  10. 10. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 10 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 10
  11. 11. Normal Combustion in SI EnginesMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 11 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 11
  12. 12. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 12 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 12
  13. 13. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 13 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 13
  14. 14. Combustion in SI engineMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 14 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 14
  15. 15. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 15 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 15
  16. 16. COMBUSTION QUALITY Flames detected Type of cycle between - 450 and TDC early burn cycle TDC and 45° Fast burning cycles 450 and 900 slow burn cycles 90° and BDC Late burn cycles BDC and TDC delayed burn cycles Flames not detected misfires and partial burn cycles Good combustion is almost entirely made up of fast burn cycles. poor combustion consists of a high proportion of late and delayed burn cycles.March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 16 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 16
  17. 17. EFFECT OF ENGINE VARIABLES ON IGNITION LAG1. Fuel2. Mixture ratio:March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 17 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 17
  18. 18. 3. Initial temperature and pressure4. Electrode gap :March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 18 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 18
  19. 19. 5. Turbulence:March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 19 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 19
  20. 20. EFFECT OF ENGINE VARIABLES ON FLAME PROPAGATION 1. Fuel-air ratio :March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 20 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 20
  21. 21. Rate of BurningMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 21 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 21
  22. 22. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 22 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 22
  23. 23. 2. Compression RatioMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 23 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 23
  24. 24. 3. Intake temperature and pressure 4. Engine load 5. Turbulence 6. Engine Speed 7. Engine sizeMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 24 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 24
  25. 25. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 25 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 25
  26. 26. Combustion Chambers for Four Stroke SI EnginesMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 26 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 26
  27. 27. Early Ricardo turbulent combustion chamber (1968)March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 27 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 27
  28. 28. Old type Combustion Chambers for SI enginesMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 28 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 28
  29. 29. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 29 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 29
  30. 30. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 30 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 30
  31. 31. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 31 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 31
  32. 32. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 32 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 32
  33. 33. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 33 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 33
  34. 34. Combustion Chambers for Two Stroke SI EnginesMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 34 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 34
  35. 35. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 35 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 35
  36. 36. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 36 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 36
  37. 37. Abnormal Combustion in SI EnginesMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 37 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 37
  38. 38. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 38 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 38
  39. 39. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 39 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 39
  40. 40. p-t diagram of a normal cycleMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 40 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 40
  41. 41. p-t diagram of a knocking cycleMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 41 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 41
  42. 42. Knock Limited Parameters  Knock Limited Compression Ratio  Knock Limited Inlet Pressure  Knock Limited Indicated Mean Effective Pressure  Performance number is defined as the ratio of Klimep with the fuel in question to Klimep with isooctane when the inlet pressure is kept constant.  Relative performance number, rpn : Actual Performance number rpn = Performance number corresponding to the imep of 100March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 42 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 42
  43. 43. EFFECT OF ENGINE VARIABLES ON KNOCK Density factors Time factors Composition factorsMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 43 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 43
  44. 44. Density Factors: Compression Ratio Mass of Inducted Charge Inlet Temperature of the Mixture Temperature of the Combustion Chamber Walls Retarding the Spark Timing Power Output of the EngineMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 44 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 44
  45. 45. Time Factors: Turbulence Engine Speed Flame Travel Distance Engine Size Combustion Chamber Shape Location of Spark PlugMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 45 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 45
  46. 46. Composition Factors: Fuel-Air Ratio:  Octane Value of the Fuel:March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 46 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 46
  47. 47. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 47 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 47
  48. 48. KNOCK RATING OF SI FUELSMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 48 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 48
  49. 49. Normal Combustion in CI EnginesMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 49 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 49
  50. 50. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 50 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 50
  51. 51. Schematic representation of a fuel jetMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 51 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 51
  52. 52. Disintegration of a fuel jetMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 52 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 52
  53. 53. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 53 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 53
  54. 54. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 54 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 54
  55. 55. Effect of fuel-air ratio on power output of CI engineMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 55 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 55
  56. 56. Stages of combustion in CI enginesMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 56 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 56
  57. 57. P-t diagram showing delay periodMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 57 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 57
  58. 58. Steps of combustion process in CI engineMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 58 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 58
  59. 59. Combustion Rate (CI)March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 59 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 59
  60. 60. Effect of varying the amount of fuel injected on P-θ diagramMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 60 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 60
  61. 61. FACTORS AFFECTING THE DELAY PERIOD Compression ratio  Engine speed  Power output  Atomization of fuel and duration of injection  Injection timing  Quality of the fuel  Intake temperature  Intake pressureMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 61 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 61
  62. 62. Effect of compression ratio on maximum air temperature and minimum autoignition temperatureMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 62 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 62
  63. 63. Effect of speed on ignition delay in a diesel engineMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 63 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 63
  64. 64. Effect of injection timing on indicator diagramMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 64 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 64
  65. 65. Effect of engine variables on ignition delayMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 65 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 65
  66. 66. Abnormal Combustion in CI EnginesMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 66 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 66
  67. 67. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 67 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 67
  68. 68. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 68 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 68
  69. 69. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 69 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 69
  70. 70. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 70 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 70
  71. 71. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 71 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 71
  72. 72. Combustion Chambers for Four Stroke CI EnginesMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 72 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 72
  73. 73. CI Engine Combustion chambers• Open chamber or DI engine• Divided chamber or IDI engineMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 73 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 73
  74. 74. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 74 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 74
  75. 75. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 75 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 75
  76. 76. Phases of Combustion in Toroidal open combustion chamberMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 76 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 76
  77. 77. M-Combustion chamberMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 77 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 77
  78. 78. IDI Combustion chambersSwirl generation: Induction induced swirl Compression induced swirl Combustion induced swirlMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 78 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 78
  79. 79. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 79 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 79
  80. 80. Combustion in Ricardo swirl Chamber - CometMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 80 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 80
  81. 81. Swirl chambersMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 81 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 81
  82. 82. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 82 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 82
  83. 83. Pre-combustion chambersMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 83 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 83
  84. 84. Mercedes Benz Pre-combustion SystemMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 84 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 84
  85. 85. March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 85 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 85
  86. 86. Advantages of DI engines Fuels of poorer ignition quality can be used. Single-hole injection nozzles and moderate injection pressures can be used and can tolerate greater degrees of nozzle fouling. Higher fuel-air ratios can be used without smoke.March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 86 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 86
  87. 87. Disadvantages of IDI Engines More expensive cylinder construction. More difficult cold starting because of greater heat loss through the throat. Poorer fuel economy due to greater heat losses and pressure losses through the throat, which result in lower thermal efficiency and higher pumping loss.March 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 87 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 87
  88. 88. Knock Rating of CI Engine Fuel• Cetane number• Variable compression ratio engine• CFR EngineMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 88 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 88
  89. 89. THE ENDMarch 16, Mallikarjuna Dr. J. M. 2013 I.C. Engines Laboratory Slide 89 March 16, 2013 Internal Combustion Engines Laboratory, Indian Institute of Technology Madras, Chennai - 600036 Slide 89

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