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Aerospace Critical Velocity?

  1. Apr 22, 2004 #1
    Critical Velocity???

    I've often come up with the term C* also called 'Critical Velocity' in rocketry. Is there any physical significance attached to this term or its just a name given to a combination of some constant terms?
     
  2. jcsd
  3. Apr 22, 2004 #2

    enigma

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    It's the characteristic velocity, not the critical velocity

    The characteristic velocity is a way to measure engine performance independant of the exhaust nozzle.

    It is defined as:

    [tex]c*=\frac{A_t * p_0}{dm/dt}[/tex]

    where
    At is the area of the throat,
    p0 is the chamber pressure
    dm/dt is the mass flow of the propellant.
     
  4. Apr 23, 2004 #3

    enigma

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    Just wanted to add:

    With a lot of re-arranging, it is a (complicated) function of gamma, the molecular mass of the combustion products, and the flame temperature.
     
  5. Apr 23, 2004 #4
    yes ofcourse! I meant 'characteristic velocity' rather than 'critical velocity' and thanks for the brief but still good explanation
     
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