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How is flow deaccelerated In the diffuser?

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in Aerodynamics by (773k points)
How is flow deaccelerated In the diffuser?

(a) Isentropic compression

(b) Isentropic expansion

(c) Adiabatic compression

(d) Adiabatic expansion

I have been asked this question in examination.

Question is from Quasi-One-Dimensional Flow Diffusers in chapter Quasi-One-Dimensional Flow of Aerodynamics

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The correct choice is (a) Isentropic compression

The explanation is: The diffuser’s function is to slow down the incoming high speed flow to a lower subsonic flow. The aim is to reduce the velocity with small loss in total pressure. The ideal diffuser does this task with the help of isentropic compression so that there is no pressure loss.

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