MAE 112 PROPULSION SECOND MIDTERM EXAM March 13, 2007 Do all three problems in eighty-eight minutes. Books, notes and calculators can be used. 1. Consider a turbine stage that has a polytropic efficiency of 0.97 for the stator (nozzle) and for the rotor flow. 75 % of the total static enthalpy drop through the stage occurs in the stator portion. The initial and final velocities for the stage are axial and have no swirl (tangential component). Assume that only the tangential component of velocity changes through the stator (nozzle) and rotor portions. The flow has γ = 1.2 and c p = 0.30 Btu/1bm ° R; the incoming flow has a static temperature of 2100 ° R, a static pressure of 20 atmospheres, and a velocity of 150 ft/sec. The flow exiting the stage has a temperature of 1550 ° R. (a) What are the enthalpy drop and pressure drop across the stator? (b) What are the enthalpy drop and pressure drop across the rotor? (c)
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This test prep was uploaded on 04/07/2008 for the course MAE 112 taught by Professor Sirgiano during the Winter '08 term at UC Irvine.