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How much pressure ratio makes one Mach number?

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+1 vote
in Fluid Mechanics by (118k points)
How much pressure ratio makes one Mach number?

(a) 0

(b) 1

(c) 2

(d) 3

The question was asked during an interview.

Question is from Flow of Compressible Fluid through Orifices and Nozzles in section Compressible Flow of Fluid Mechanics

1 Answer

+2 votes
by (362k points)
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Best answer
Right option is (c) 2

Easiest explanation: The overall pressure ratio is given by Pb/Pt.  The overall pressure ratio must be approximately 2 to attain the Mach number of one. It is because of the changes in the downstream and upstream of flow in the nozzle.

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