ISRO Mechanical & Aerospace 2009 - Question 26

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For one-dimensional isentropic flow in a diverging passage, if the initial static pressure is P1, and the initial Mach number is M1 (M1 < 1), then for the downstream flow

  • A. M2 < M1 ; P2 < p1
  • B. M2 > M1 ; P2 > p1
  • C. M2 < M1 ; P2 > p1
  • D. M2 > M1 ; P2 < p1

Answer: C. M2 < M1 ; P2 > p1

Explanation: Subsonic flow (M < 1) in a diverging duct (diffuser) results in decreased velocity (and Mach number) and increased pressure.

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