FinalExam_2008 - MAE 112 PROPULSION FINAL EXAM Do all four...

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1 MAE 112 PROPULSION FINAL EXAM March 20, 2008 Do all four problems in 120 minutes. Books, notes and calculators can be used freely. The exam questions extend to the reverse side of this page. I. Consider a ramjet in flight at a Mach number of 2.3 with ambient conditions at 270 K and 0.8 atmospheres of pressure. The inlet design involves first a wedge that deflects the stream by an angle of 15 degrees followed by a Kantrowitz-Donaldson (K-D) diffuser. The air capture area following the oblique shock (i.e., entrance area to K-D diffuser) is 1 square meter, measured orthogonal to the velocity after that shock. a) What is the stagnation temperature of that flow through the inlet / diffuser? b) What is the mass flow through the ramjet? c) What are the stagnation pressure values ahead of and immediately behind the first (i.e., oblique) shock? d) What is the flow Mach number at the entrance to the K-D diffuser for design conditions? e) What is the cross-sectional area of the diffuser throat?
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