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Optimal Design of Turbofan

Optimal Design of Turbofan. P M V Subbarao Professor Mechanical Engineering Department. Its Time to think about fuel Economy!!!. Best Selling Turbofans in World CFM series. Current Turbofan Engines. Simplified Objective Function. For maximum fuel economy, maximize the denominator.

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Optimal Design of Turbofan

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  1. Optimal Design of Turbofan P M V Subbarao Professor Mechanical Engineering Department Its Time to think about fuel Economy!!!

  2. Best Selling Turbofans in World CFM series

  3. Current Turbofan Engines

  4. Simplified Objective Function For maximum fuel economy, maximize the denominator. Fan Effects : Fan Pressure Ratio & Bypass Ratio.

  5. Modified Objective Function Rewrite OF for best  as:

  6. Relative change in Turbine TR to BPR

  7. The final Objective function for best 

  8. Optimum Bypass ratio for Minimum TSFC Solve above equation for optimum bypass ratio to give minimum specific fuel consumption. Further use of aoptto calculate velocities of cold and hot jets will give ? ????

  9. Best  for Maximum Fuel Economy : Effect of Compressor Pressure Ratio aopt T04=1700K r0,p,fan=2.0 Mac=0.9 r0,p,comp

  10. Best  for Maximum Fuel Economy : Effect of Fan Pressure Ratio T04=1700K r0,p,comp=24.0 Mac=0.9 aopt r0,p,fan

  11. Best  for Maximum Fuel Economy : Effect of Flight Mach Number T04=1700K r0,p,comp=24.0 r0,p,fan=2.0 aopt r0,p,fan=3.0 Mac

  12. Selection of Optimum Fan Pressure Ratio f is a weak function of  !!!???!!!

  13. Maximum Fuel Economy : Effect of Compressor Pressure Ratio T04=1700K a=4.0 Mac=0.9 rfan,opt rcomp

  14. Maximum Fuel Economy : Effect of Bypass Ratio rfan,opt r0,p,comp=24.0 Mac=0.9 a

  15. Best  for Maximum Fuel Economy : Effect of Fan Pressure Ratio T04=1700K r0,p,comp=24.0 Mac=0.9 aopt r0,p,fan rfan,opt a

  16. Design Charts : Contours of Constant TSFC TSFC r0p,fan a

  17. Design Charts : Contours of Constant Specific Thrust r0p,fan a

  18. Latest Turbofan Models form PW

  19. Green Engines

  20. How to Facilitates Afterburner ??? Serves, Defense & Space Applications ….

  21. 7 8 4 5 6h 1 2 3 6c Mixed Flow Turbofan Engine Condition for Ideal Mixing:

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