Stagnation pressure

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Stagnation pressure is the pressure at a stagnation point in a fluid flow, where the kinetic energy is converted into pressure energy.

It is the pressure a fluid retains when brought to rest isentropically.

Assuming an isentropic process, the stagnation pressure ratio can be calculated:

[P/p = (T/t)^\,]

where:

[P =\,] stagnation (or total) pressure aka To1

[p =\,] static pressure

[T =\,] stagnation (or total) temperature in kelvins

[t =\,] static temperature in kelvins

[\gamma\ =\,] ratio of specific heats

Stagnation quantities (e.g. stagnation temperature, stagnation pressure) are frequently used in jet engine performance calculations.

Pitot tubes are used to measure stagnation (or total) pressure. A combined pitot/static tube is used on aircraft to determine flight speed.

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