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Consider a perfect gas flowing in a constant-area. Duct adiabatically and without fri

  1. Feb 4, 2009 #1
    1. The problem statement, all variables and given/known data

    Consider a perfect gas flowing in a constant-area. Duct adiabatically and without friction. Changes in state come about as the result of changes in elevation in the earth's gravity field. The z-direction is away from the center of the earth, and hence gravity acts in the negative z-direction.
    (a) Starting from first principles, determine by analysis the direction of change (increase or decrease) of the Mach l\umber, gas speed, sound speed, density, pressure, stagnation temperature, and isentropic stagnation pressure, all for a positive increase in z,

    (i) For subsonic speeds
    (ii) For 3upersonic speeds


    2. Relevant equations

    continouty, momentum & energy equation
    m=v/a

    3. The attempt at a solution
     
  2. jcsd
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