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What is the diffuser efficiency for supersonic flow?(a) ηD = 1(b) ηD > 1(c) ηD < 1(d) ηD = 1/2I got this question in exam.Question is taken from Quasi-One-Dimensional Flow Diffusers topic in portion Quasi-One-Dimensional Flow of Aerodynamics

Answer» CORRECT answer is (b) ηD > 1

For explanation: The diffuser efficiency is given by the RATIO of actual total pressure ratio across the diffuser to the total pressure ratio of a hypothetical normal shock wave at test section Mach number. For a supersonic test section Mach number, the diffusers perform better than the normal shock, thus the numerator of the ratio is greater than the denominator, HENCE ηD > 1.


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