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For a subsonic flow, what should be the value of dA to get flow acceleration?(a) Zero(b) Negative(c) Positive(d) OneI 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

Answer»

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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