What is the relation between back pressure and exit pressure in case of subsonic flow at the nizzle’s exit?(a) pB = pe(b) pB > pe(c) pB < pe(d) pB = 2peI got this question at a job interview.I'm obligated to ask this question of Governing Equations for Quasi One Dimensional Flow topic in section Compressible Flow through Nozzles, Diffusers and Wind Tunnels of Aerodynamics

What is the relation between back pressure and exit pressure in case o

1.	What is the relation between back pressure and exit pressure in case of subsonic flow at the nizzle’s exit?(a) pB = pe(b) pB > pe(c) pB < pe(d) pB = 2peI got this question at a job interview.I'm obligated to ask this question of Governing Equations for Quasi One Dimensional Flow topic in section Compressible Flow through Nozzles, Diffusers and Wind Tunnels of Aerodynamics
Answer» Right choice is (a) pB = pe For explanation I would say: Back PRESSURE, which is the pressure downstream the nozzle’s EXIT is equal to the exit pressure when the FLOW at the exit is subsonic. This is because of a DISCREPANCY between maintaining a steady subsonic flow in case of pressure difference.

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