Discussion
An intake supplies air at Mach 0.5 to a compressor face of area \( 1.2 \ \mathrm{m^2} \). Doubling the area at the same mass flow would give an approximate Mach number of
Answer: D
At low Mach numbers the density change is modest, so halving the velocity roughly halves the Mach number. The relation is not exactly linear because density rises as the flow slows, but the estimate is close enough for a first sizing.
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