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The trends of velocity change in a duct for both subsonic and supersonic flow are identical.(a) True(b) FalseI got this question by my college professor while I was bunking the class.My doubt stems from Area-Velocity Relation in chapter Quasi-One-Dimensional Flow of Aerodynamics

Answer»

Right option is (b) False

Explanation: For a flow in a DUCT, both supersonic and SUBSONIC flows show OPPOSITE trends. For a subsonic flow (M < 1), the velocity increases in a convergent duct and DECREASES in the DIVERGENT duct. On the other hand, for a supersonic flow (M > 1), the flow increases in a divergent duct and decreases in the convergent duct.



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