impact pressure


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impact pressure

[′im‚pakt ‚presh·ər]
(fluid mechanics)

impact pressure

i. The pressure of a moving fluid brought to rest that is in excess of the pressure the fluid has when it does not flow (i.e., total pressure less static pressure). Impact pressure is equal to dynamic pressure in an incompressible flow, but, in a compressible flow, impact pressure includes the pressure change attributable to the compressibility effect.
ii. A measured quantity obtained by placing an open-ended tube, known as an impact tube or a pitot tube, in a gas stream and noting the pressure in the tube on a suitable manometer. Since the pressure is exerted at a stagnation point, the impact pressure is sometimes referred to as the stagnation pressure or the total pressure. See stagnation pressure.
References in periodicals archive ?
However, designers working in such application areas have until recently struggled to accurately quantify the particle distribution and impact pressure of fluid or gas spray.
For example, avalanches that flow warm and wet smash with an impact pressure that increases with depth, hitting the hardest at the avalanche base.
The different strain rates are obtained by adjusting the different impact pressure, and impact pressure is 0.
When it enters the atmosphere, impact pressure causes the body to heat up and emit light.
The second column for each coating was treated with the water jet for 10 s at a jet impact pressure of 18 kPa for C.
From 1 bar to 7 bar, an impact pressure nozzle blows a stream of air or inert gas down on the DUT from a controlled height, inducing a known pressure on the membrane of the device (Figure 1).
He proposes that rock debris (crushed in the compression stage of impact) beneath a crater moves like a fluid when strong impact pressure waves pass through it.
The crushed fiber-optic diagnostic utilizes the black-body radiation produced by optical fibers under extreme impact pressure.
An integral regulator sets pin impact pressure and depth of mark.
Although it cannot supply true hypervelocity, which is necessary for aerodynamic tests, it can simulate a hypersonic stream in terms of thermal energy; thus it provides a means for experimental study of stream impact pressure and aerothermal loads.