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Homework Help: Solving Ramjets

  1. Dec 4, 2009 #1
    I usually try to avoid asking how to do entire question sets, but I'm officially at loss at the moment. I need a point in the right direction.

    1. The problem statement, all variables and given/known data
    I have a ramjet that has a velocity of 2500 km/h, pressure is 40 kPa, and temperature is 240K
    Head addition is 1080 kJ/kG
    Velocity at diffuser exit and nozzle inlet can be neglected

    2. Relevant equations
    Propulsion efficiency = W/Qin

    3. The attempt at a solution
    I need to solve for velocity at the exit of the nozzle, and overall propulsion efficiency.
    I'm also supposed to use Air Standard assumptions. Does this help at all?

    If this helps in solving the solution at all, I've solved for the pressure at the diffuser exit to be 457.47, with Pr as 7.268
    Last edited: Dec 4, 2009
  2. jcsd
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