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

2. Ideal Model of Compressor 1. Steady-state 2. Isentropic: Adiabatic and reversible 3. One stream in and one stream out 4. Changes in KE and PE are small compared to enthalpy change  ‚„ „„ „ 

3. Turbojet Thrust VaVa VjVj Assume ideal case where P a = P j & assume that Area a = Area j Drag Force

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 V j  V a. This is why turbofans were created, they provide thrust with a low velocity jet to get high efficiency!

6. Turbofan