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What is Stagnation Pressure – Pitot Pressure – Definition

Stagnation Pressure – Pitot Pressure. Stagnation pressure (or pitot pressure or total pressure) is the static pressure at a stagnation point in a fluid flow. Thermal Engineering

Stagnation Pressure – Pitot Pressure

In general, pressure is a measure of the force exerted per unit area on the boundaries of a substance. In fluid dynamics and aerodynamics, stagnation pressure (or pitot pressure or total pressure) is the static pressure at a stagnation point in a fluid flow. At a stagnation point the fluid velocity is zero and all kinetic energy has been converted into pressure energy (isentropically). This effect is widely used in aerodynamics (velocity measurement or ram-air intake).

Stagnation pressure is equal to the sum of the free-stream dynamic pressure and free-stream static pressure.

stagnation pressure - total pressure

Static pressure and dynamic pressure are terms of Bernoulli’s equation:

Bernoulli Theorem - Equation

The Bernoulli’s effect causes the lowering of fluid pressure (static pressure – p) in regions where the flow velocity is increased. This lowering of pressure in a constriction of a flow path may seem counterintuitive, but seems less so when you consider pressure to be energy density. In the high velocity flow through the constriction, kinetic energy (dynamic pressure – ½.ρ.v2) must increase at the expense of pressure energy (static pressure – p).

The simplified form of Bernoulli’s equation can be summarized in the following memorable word equation:

static pressure + dynamic pressure = total pressure (stagnation pressure)

Total and dynamic pressure are not pressures in the usual sense – they cannot be measured using an aneroid, Bourdon tube or mercury column.

Stagnation pressure is sometimes referred to as pitot pressure because it is measured using a pitot tube. A Pitot tube is a pressure measurement instrument used to measure fluid flow velocity. Velocity can be determined using the following formula:

pitot tube - formula - velocity


  • u is flow velocity to be measured in m/s,
  • pis stagnation or total pressure in Pa,
  • pt is static pressure in Pa,
  • ρ is fluid density in kg/m3.
Heat Transfer:
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Nuclear and Reactor Physics:

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Advanced Reactor Physics:

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  2. K. O. Ott, R. J. Neuhold, Introductory Nuclear Reactor Dynamics, American Nuclear Society, 1985, ISBN: 0-894-48029-4.
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  4. E. E. Lewis, W. F. Miller, Computational Methods of Neutron Transport, American Nuclear Society, 1993, ISBN: 0-894-48452-4.

See also:


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