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Why can’t build an ideal supersonic diffuser with no total pressure losses?(a) Presence of shock waves(b) Varying cross – sectional area(c) Varying throat area(d) Choked flowThe question was asked in a job interview.I would like to ask this question from Quasi-One-Dimensional Flow Diffusers topic in section Quasi-One-Dimensional Flow of Aerodynamics

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Right CHOICE is (a) Presence of shock waves

Best explanation: DUE to the presence of oblique shock waves on the convergent portion, the ideal supersonic diffuser is far from achievable. This CONTRIBUTES to the breaking of the isentropic flow characteristics according to which the entropy in the diffuser is constant. In fact, the flow in REALITY is viscous and there is an increase in entropy near the boundary LAYER.



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