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For a subsonic flow, what should be the value of dA to get flow acceleration?

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in Aerodynamics by (773k points)
For a subsonic flow, what should be the value of dA to get flow acceleration?

(a) Zero

(b) Negative

(c) Positive

(d) One

I have been asked this question in an interview for job.

This interesting question is from Area-Velocity Relation in portion Quasi-One-Dimensional Flow of Aerodynamics

1 Answer

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Correct answer is (b) Negative

The best I can explain: According to the area-velocity relation for a quasi one-dimensional flow, when the flow is subsonic Mach number is less than 1 resulting in the quantity M^2-1 being negative. Therefore for achieving accelerated flow, dA has to be negative.

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