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Homework Help: Need help with this Gas Dynamic Project

  1. Sep 6, 2014 #1
    1. The problem statement, all variables and given/known data
    A 2-D nozzle shown in picture 1 is to be analyzed. The nozzle is working with critical condition at
    the throat.
    I haven attached a Pdf and .jpg file for the figure
    ReD* :230000
    D* :6mm
    T0 :300 K
    Diffusor half angle : 3°
    Diffusor lenght :7D
    Medium :Air
    Κ :1,4
    R :287 J/kgK
    μ0 :18,6.10-6 Pas
    ρ0 :1,2 kg/m³

    2. Relevant equations
    By using the following equations
    m/A=P0√κ/√RT0(1+κ−1/2M2)κ+12(κ−1) (1)
    ReDx= 4m/∏Dx ν (2)

    3. The attempt at a solution
    I have no idea how to solve analytically please guide me

    1) Solve analyticaly the 1st, 2nd and 3rd critical poit. Choose a pressure ratio for a
    shock in the diffusor part. Solve all the values (p, T) for the exit. Put the values in to
    starCCM+ and compare your analytical results with the results from starCCM+.
    2) Solve the location of the shock and compare the position from your result with
    3) Plot all the pressure distributions from starCCM+ along the axis in one graph. (p/p0
    vs position).
    4) Compare the time averaged massflowrate with the theoretical massflow. Do you
    have some differences.

    Attached Files:

  2. jcsd
  3. Sep 16, 2014 #2
    I'm sorry you are not finding help at the moment. Is there any additional information you can share with us?
  4. Sep 16, 2014 #3
    well i have uploaded the complete question detail more i could say is it is a convergent divergent nozzle this question is basically from gas dynamics convergent divergent nozzle topic
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