AME436-S08-PS5

AME436-S08-PS5 - AME 436 Assigned: 4/5/2008 Problem Set #5...

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Unformatted text preview: AME 436 Assigned: 4/5/2008 Problem Set #5 Due: 4/12/2008 at 4:30 pm in OHE 430 (fax to me at 213-740- 8071 if you’re off campus) Problem #1 For each of the following equations a) – c) used frequently in this course, state whether or not each of the following restrictions i) – viii) apply. i. Steady ii. one-dimensional flow iii. ideal gas iv. constant specific heats v. reversible vi. adiabatic vii. no work transfer viii. negligible change in kinetic energy a) Thrust equation: T = ˙ m a [(1+FAR)u e-u 1 ] + (P e-P a )A e b) Enthalpy/velocity relation between states 1 and 2: h 1 + u 1 2 2 = h 2 + u 2 2 2 c) Temperature/pressure relation between states 1 and 2: P 1 P 2 = T 1 " " # 1 T 2 " " # 1 Problem #2 Using the Brequet range equation, estimate within a factor of 10 the range of a seagull. When estimating the heating value of seagull food, note that 1 diet calorie = 1000 thermodynamic calories. (This question always throws students for a loop. The point is not to get an exact answer, but to estimate each of the terms in the Brequet range equation, and see if the result is reasonable or not.) Problem #3 Air, ! = 1.4 1 2 3 Shock q in M 1 = 5 P = P 1 T = T 1 M 2 = ??? P 2 /P 1 = ??? T 2 /T 1 = ??? M 3 = ??? P 3 /P 1 = ??? T 3 /T 1 = ??? Consider a very simple propulsion system operating at a flight Mach number of 5 that consists of 2 processes: Process 1 : Shock at entrance to duct Process 2 : Heat addition in a constant-area duct...
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This note was uploaded on 07/22/2008 for the course AME 436 taught by Professor Ronney during the Spring '08 term at USC.

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AME436-S08-PS5 - AME 436 Assigned: 4/5/2008 Problem Set #5...

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