Is it possible to have a Mach number greater than 1 at the throat?
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Mar5-12, 06:36 PM
The maximum attainable fluid velocity at the throat of a converging-diverging nozzle is M=1. This has to do with the factor 1/(1-M^2) term in the compressible flow nozzle equation approaching infinity.
According to "Introduction to Fluid Mechanics, Sixth Edition" by Fox et. al., Pg. 624:
"The important result is that for isentropic flow the sonic condition M=1 can only be attained at the throat, or section of minimum area. (This does NOT mean that a throat must have M=1. After all, we may have no flow at all in the device!)"
Does that mean M=1 is the max that can be seen at the throat?