GATE ME 2022 Set 2 — Question 24
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Fluid Mechanics → Compressible Flow → Normal Shock
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Question
Consider a steady flow through a horizontal divergent channel, as shown in the figure, with supersonic flow at the inlet. The direction of flow is from left to right.
Pressure at location B is observed to be higher than that at an upstream location A. Which among the following options can be the reason?
Correct answer
(B) Normal shock
Solution
In a divergent channel () with supersonic flow (), the flow normally expands, meaning velocity increases () and pressure decreases (). If the pressure at the downstream location B is higher than at the upstream location A (), it indicates a sudden compression. This occurs when a normal shock wave is present between points A and B, which causes the flow to become subsonic and results in a significant jump in pressure.
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