What happens to a subsonic flow when it passes through a converging duct?

For subsonic air flowing through a convergent duct, it decreases pressure and increases velocity. The opposite happens when flowing through a divergent duct.

Why does velocity increase in convergent nozzle?

A nozzle is convergent, i.e., the cross sectional area decreases towards the outlet. Since the mass flow rate is constant, the velocity must increase, in order to maintain the mass flow rate.

How will the flow change in a converging nozzle for supersonic flow?

The flow accelerates out of the chamber through the converging section, reaching its maximum (subsonic) speed at the throat. Unlike a subsonic flow, the supersonic flow accelerates as the area gets bigger. This region of supersonic acceleration is terminated by a normal shock wave.

Why does velocity increase in a nozzle?

Nozzles are frequently used to control the rate of flow, speed, direction, mass, shape, and/or the pressure of the stream that emerges from them. In a nozzle, the velocity of fluid increases at the expense of its pressure energy.

What happens to velocity in the converging duct of nozzle?

With the presence of a converging duct, the velocity decreases. At this point, the area of the duct is more than zero.

What happens to the sound speed as the flow goes through the converging diverging nozzle with supersonic flow at the exit?

The general design of a converging-diverging nozzle is such that the initially low speed gas is accelerated as it is squeezed into the throat (with minimum diameter) at which it reaches the speed of sound. It is then accelerated further as it is now a supersonic flow moving through a diverging nozzle.

Why is a diverging nozzle converging?

A converging diverging nozzle is generally intended to produce supersonic flow near the exit plane. If the back pressure is set at (vi), the flow will be isentropic throughout the nozzle, and supersonic at nozzle exit.

What are subsonic flows?

Definition of subsonic flow : directed motion of a fluid medium in which the velocity is less than that of sound in the medium throughout the region under consideration.