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Gas Turbine Components: Closed Cycle - PowerPoint PPT Presentation


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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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ideal model of compressor

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ƒ

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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
turbojet thrust
Turbojet Thrust

Drag Force

Va

Vj

Assume ideal case where Pa = Pj & assume that Areaa = Areaj

turbojet thrust1
Turbojet Thrust
  • Conservation of momentum
  • Apply in x-direction
propulsion efficiency
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!