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gas turbine
There are two main types of gas turbines: axial and radial. Axial turbines are used for large engines and have higher efficiencies but are more expensive to manufacture. Radial turbines are used for small engines and are cheaper and easier to manufacture but have lower efficiencies. Turbine blades can be cooled internally using convection or impingement, or externally using film or effusion cooling to distribute coolant over the blade surface. Sealing systems in gas turbines use different types of seals like labyrinth, ring, hydraulic, carbon, and brush seals to prevent oil leakage and control cooling airflows, with ring seals commonly used except in hot areas and specialized seals to prevent hot gas ingestion into turbine disc cavities.
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gas turbine
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- 2. Classification of gasturbine from fluid direction AxialRadial Used for large engines►Used for small engines► Large mass flow rates►Small mass flow rates► Better efficiencies►Lower efficiencies► Expensive►Cheap► Difficult to manufacture►Easy to manufacture► 1-Radial in flow turbine -the cantilever radial-inflow turbine -the mixed-flow radial-inflow 2-Axial in flow turbine -impulse type -reaction type.
- 3. Impulse and ReactionTurbine ReactionImpulse Multi stage pressure compounded impulse Multi stage velocity compounded impulse
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- 5. Methods of Cooling 1-Internalcooling . Convection cooling . Impingement cooling
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- 7. Film cooling effectivenessdistribution (b) Mach number distribution(a) Pressure distribution Pressure and Mach number distribution without coolant injection Film cooling effectiveness distribution for seven-row design
- 8. Function of SealingAir System -To prevent oil leakage from engine bearing chambers. -To control cooling airflows of the main stream gas to the turbine disc cavities. Type of sealing method: -Labyrinth Seals -Ring Seals -Hydraulic Seals -Carbon Seals -Brush Seals -Hot Gas Ingestion
- 9. Ring Seal This typeof seal used For bearing chamber sealing, except hot areas. Ring type oil seal
- 10. Hot Gas Ingestion Thistype of seal used: To prevent the ingestion of hot mainstream gas into the turbine disc cavities.
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