Choked Nozzle Jet Engine

So the nozzle is choked if p2p1 is less than or equal k12 k k 1 we were normally given k14 as a condition.

Extension nozzle for pressure washer. If the nozzle pressure ratio is above the critical value about 181 a convergent nozzle will choke resulting in some of the expansion to atmospheric pressure taking place downstream of the throat ie smallest flow area in the jet wake. It looks like this. When the back pressure is decreased slightly below the reservoir pressure a signal from beyond the nozzle exit is transmitted at sonic speed to the reservoir.

Where p p1 k12 k k 1 and p1 is entry pressure. If we increase the pressure at one end then air will flow to the other end. The effectiveness of optically blocking the hot engine parts by reducing the choked nozzle exit area.

The nozzle is choked if the back pressure p2 is less than or equal to the critical pressure p. The duct is restricted at some point in the middle. Convergent nozzles are used on many jet engines.

Choked flow can occur through a convergent flow area or nozzle attached to a huge reservoir. Flow exits the reservoir through the nozzle if the back pressure is less than the reservoir pressure. Although jet momentum still produces much of the gross thrust the imbalance between the throat static pressure and atmospheric pressure still generates some pressure thrust.