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Which of these results in decrease of the flow inside the actual supersonic diffuser?

Which of these results in decrease of the flow inside the actual supersonic diffuser? Correct Answer Shock waves

In case of actual supersonic diffuser, there’s a series of oblique shock formations. It’s present in the convergent and the test section of the wind tunnel. The interaction between the viscous flow and the shock waves resulting in slowing down the flow velocity.

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