What is the pressure ratio for chocking condition?

Question

Accepted Answer

Pressure ratio for chocking condition is the critical pressure ratio at which the flow of a fluid becomes choked.

The pressure ratio for chocking condition is the ratio of the outlet pressure to the inlet pressure at which the flow becomes choked.
It is a critical parameter in the design of nozzles, valves, and other flow control devices.
For air flowing through a nozzle, the pressure ratio for chocking condition is approximately 0.528.

Accepted Answer

The pressure ratio for choking is significant because it helps to determine when choking will occur in a fluid flow system. For an ideal gas flowing through a converging-diverging nozzle (such as in a rocket engine or a gas turbine), the pressure ratio at which choking occurs is related to the Mach number at the throat of the nozzle. Specifically, for an isentropic process, the pressure ratio 
𝑃
2
𝑃
1
P 
1
​
 
P 
2
​
 
​
  at choking is given by the ratio of the critical pressure 
𝑃
∗
P 
∗
  to the upstream pressure 
𝑃
1
P 
1
​
 .

(
𝑃
2
𝑃
1
)
choke
=
(
𝑃
∗
𝑃
1
)
( 
P 
1
​
 
P 
2
​
 
​
 ) 
choke
​
 =( 
P 
1
​
 
P 
∗
 
​
 )

What is the pressure ratio for chocking condition?

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