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Gas Turbine Components: Closed Cycle

2. 3. Turbine. Compressor. 4. 1. Gas Turbine Components: Closed Cycle. „. „. „. . ‚. ƒ. ƒ. „. Ideal Model of Compressor. Steady-state Isentropic: Adiabatic and reversible One stream in and one stream out Changes in KE and PE are small compared to enthalpy change.

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Gas Turbine Components: Closed Cycle

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  1. 2 3 Turbine Compressor 4 1 Gas Turbine Components: Closed Cycle

  2. „ „ „  ‚ ƒ ƒ „ Ideal Model of Compressor • Steady-state • Isentropic: Adiabatic and reversible • One stream in and one stream out • Changes in KE and PE are small compared to enthalpy change

  3. Turbojet Thrust Drag Force Va Vj Assume ideal case where Pa = Pj & assume that Areaa = Areaj

  4. Turbojet Thrust • Conservation of momentum • Apply in x-direction

  5. Propulsion efficiency • Propulsion efficiency in this idealized case is then 1 • The propulsion efficiency goes to __ as VjVa. • This is why turbofans were created, they provide thrust with a low velocity jet to get high efficiency!

  6. Turbofan

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