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MAE112HW5

# MAE112HW5 - Due MAE 112 Homework Assignment#5 1 Suppose a...

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1 Due: February 19, 2010 MAE 112 Homework Assignment #5 1. Suppose a particular compressor has a compression ratio P 2 /P 1 = 8 and the incoming air temperature is 300K. If the adiabatic efficiency is .94, what is (a) the final temperature? (b) the average polytropic efficiency? (c) the entropy change? (d) What is the power required, if 45 lbm per sec. flow through the compressor? 2. Consider one-stage of a compressor with a 10% static pressure rise across the rotor followed by another 10% pressure rise across the stator (compounded to be 21%). The incoming flow has a velocity of 80 ft/sec in the axial direction, a temperature of 620 R and a pressure of 3.0 atmospheres. = 1.4; c p = 0.24 Btu/1bm o R; polytropic efficiency = 0.96 for the compressor stage. What is the power for this stage per unit mass flow of the compressor? If the rotor blade speed averages 950 ft/sec, what is the tangential component of velocity exiting the rotor? 3. Consider a turbine stage that has a polytropic efficiency of 0.97 for the stator (nozzle) and for the rotor flow.

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