What happens to the velocity of the supersonic flow in the divergent duct?

A)
Increases
B)
Decreases
C)
Remains the same
D)
Changes periodically

Correct Answer :   Increases


Explanation : Supersonic flows have M > 1 which results in M2 – 1 value in the area – velocity relation to be positive. Thus for divergent sections where cross – sectional area increases with x, the value of velocity increases.