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f14_mud_0304 - shock cause high drag on a blunt nose at...

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Lecture F14 Mud: Normal Shock Waves, Speed of Sound 1. What does “h.o.t.” mean? (1 student) Higher Order Terms. Stuff like d� da , du 2 , which become neglible relative to d� or da in the infinitesimal limit. 2. What are the small-shock equations used? (1 student) For determining the speed of sound a , like we did in class. Also for describing the propagation of sound waves in general. 3. What in the infinitesimal-wave analysis becomes invalid for finite waves? (1 student) The assumption of isentropic flow becomes invalid. Also, the speed of sound a is the speed of weak waves. Finite shock waves travel at a greater speed V s > a . 4. Confused about different frames when looking at the shock. (1 student) Tough to go over without a board. Maybe in recitation. 5. Does the
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Unformatted text preview: shock cause high drag on a blunt nose at supersonic speeds? (1 student) Yes! That’s why supersonic airplanes have pointy noses. Re-entry vehicles are blunt ±or several reasons, one o± them being the ±act that high drag is desirable ±or slowing down during re-enetry. 6. What does “breaking the sound barrier” mean? (1 student) Not much, nowadays. Be±ore 1945, this “barrier” was considered as a technological barrier, rather than something the pilot had to “break”. 7. No mud (4 students)...
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