Impact Pressure
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Impact Pressure
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1. That pressure of a
moving fluid
brought to rest which is in excess of the pressure the fluid has when it does
not flow, i.e., total
pressure less static
pressure.
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Impact pressure is equal to dynamic pressure in incompressible flow,
but in compressible flow impact pressure includes the pressure change owing to
the compressibility effect.
</dd>
2. A measured quantity obtained by placing an open-ended tube, known as an
impact tube or pitot tube,
in a gas stream and noting the pressure in the tube on a suitable manometer.
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Since the pressure is exerted at a stagnation
point, the impact pressure is sometimes referred to as the stagnation
pressure or total pressure.
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References
This article is based on NASA's Dictionary of Technical Terms for Aerospace Use