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Compressible Flow: Flow in nozzles

  1. Jun 6, 2009 #1
    1. The problem statement, all variables and given/known data

    I am currently studying for finals, and I am really confused about compressible flow in nozzles. Some questions I have:

    1) What is exactly is the condition for choked flow for converging, diverging, and converging-diverging nozzles?
    2) When can we assume that the back pressure pb = pe (exit pressure)?
    3) What is the condition for shock waves to form? How do we know when to check for them? How do we know where they are (ie in the throat, just upstream/downstream...)
    4) What is the design pressure and design conditions? What do we use these for?

    2. Relevant equations

    Not choked: p0 > pb > p* where p0 = stagnation pressure (no velocity)
    pb = back prz
    p* = critical prz
    Choked: pb < p*

    Shock wave if: p*>pb>pe (where?)

    3. The attempt at a solution
  2. jcsd
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