Analysis & Selection of Design Space for Turbofan

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Presentation transcript:

Analysis & Selection of Design Space for Turbofan P M V Subbarao Professor Mechanical Engineering Department Make the Jet Pair Made for Each Other???

Ideal Turbofan Cycle Inlet 2 3 cj 7 or hj 4 1 5 6

Theory of Turbofan Propulsion : Just Enough Work The power inputs to the compressor & fan = The power output of the turbine

Life Infusion Vs Life Loss

Capacity of Hot Nozzle Isentropic Hot Nozzle: Available life at the inlet to the nozzle will decide the magnitude of T7h & M7h However the strength of hotjet is limited. Also Jet static temperature is low.

Velocity of Hot Jet

Capacity of Cold Nozzle Isentropic Cold Nozzle Inlet cj 3

Velocity of Cold Jet

Velocity of Jets : Relative Strengths

Generation of Thrust : The Capacity Specific Thrust based on total flow Specific Thrust based on core flow

Relative Contributions of Cold and Hot Jets : Thrust Ratio Ratio of specific thrust per unit mass flow of core stream to specific thrust per unit mass flow of fan stream.

Thrust Specific Fuel Consumption TSFC

Performance Analysis of Turbofan Operational Parameters : Flight Mach number & Ambient conditions. Design Variables : Fan Pressure Ratio, Bypass Ratio, Compressor Pressure Ratio, Combustion Chamber Temperature Ratio. Fan Effects : Fan Pressure Ratio Bypass Ratio. Fan Stream Thrust Vs Total Thrust.

Compactness : Turbojet Vs Turbofan For same level of life & Energy of jet Turbojet Turbofan

Influence of Fan : Bypass Ratio : Mac =0.75 TSFC r0,p,fan=2.5 r0,p,comp=15 T0max=1200K

Influence of Fan: Pressure Ratio: Mac = 0.75 r0,p,comp=15.0 a=4.0 T0max=1200K