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chap4_57_67

# chap4_57_67 - AAE 439 Velocity Definitions Exit Velocity ve...

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AAE 439 Velocity Definitions Exit Velocity v e The physical velocity of the exhaust flow at the nozzle exit plane. Effective Exhaust Velocity c A theoretical exhaust velocity that takes into account the pressure differences at the exit plane. Characteristic Velocity c* Another theoretical velocity that indicates the efficiency and energy released by a combustor/propellant combination. T = mv e + ( p e p a ) A e = mc = mI sp g 0 c = I sp g 0 = T m = v e + ( p e p a ) A e m c * = p 0 A * m Ch4 – 48a

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AAE 439 Velocity Definitions Characteristic Velocity This form of characteristic velocity is useful because we can use it and the definition of the thrust coefficient C F to give an alternative definition for the effective exhaust velocity c as follows: With this formula the effective exhaust velocity, which helps calculate mission- level parameters like thrust and specific impulse, can be calculated from a pair of system-level parameters that only depend on your choice of propellant and the physical details of your rocket engine.
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