gas turbine

12
Gas turbine

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Post on 14-Jun-2015

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  • 1. Gas turbine

2. Classification of gas turbine from fluid direction AxialRadial Used for large enginesUsed for small engines Large mass flow ratesSmall mass flow rates Better efficienciesLower efficiencies ExpensiveCheap Difficult to manufactureEasy to manufacture 1-Radial in flow turbine -the cantilever radial-inow turbine -the mixed-ow radial-inow 2-Axial in flow turbine -impulse type -reaction type. 3. Impulse and Reaction Turbine ReactionImpulse Multi stage pressure compounded impulse Multi stage velocity compounded impulse 4. Blade Materials 5. Methods of Cooling 1-Internal cooling . Convection cooling . Impingement cooling 6. 2-External cooling .Film cooling .Cooling effusion 7. Film cooling effectiveness distribution (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 Sealing Air 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 type of seal used For bearing chamber sealing, except hot areas. Ring type oil seal 10. Hot Gas Ingestion This type of seal used: To prevent the ingestion of hot mainstream gas into the turbine disc cavities. 11. Maintenance 12. Advanced Technology