ME+112++Exam1_2004

# ME+112++Exam1_2004 - MAE 112 PROPULSION MIDQUARTER EXAM...

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MAE 112 PROPULSION MIDQUARTER EXAM February 13, 2004 Do all three problems in one-hundred-and-ten minutes. Books, notes and calculators can be used freely. 1. Consider a rocket nozzle with initial pressure and temperature of twenty-five atmospheres and 3600 ° R. The value of γ = 1.2 and the value of c p = .32 Btu/1bm ° R. The throat area is 0.4 ft 2 . The molecular weight of the gas is 30. The flow is perfectly expanded to the ambient pressure of one atmosphere. Assume 98% polytropic efficiency. Calculate: (a) the exhaust velocity, (b) the mass flow, (c) the thrust coefficient, and (d) the thrust. 2. Consider a ramjet in flight at a Mach number of 2.25 with ambient conditions at 298 K and one atmosphere of pressure. The air capture area in the free stream is 1.5 square meter. The inlet design involves first a wedge that deflects the stream by an angle of 20 degrees followed by a Kantrowitz-Donaldson (K-D) diffuser. The air intake occurs only on one side of the wedge. (a) What is the mass flow through the ramjet?

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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.

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ME+112++Exam1_2004 - MAE 112 PROPULSION MIDQUARTER EXAM...

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