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مکانیک::
گرادیان فشار
It is produced from pressure gradients acting on the density gradient between the less dense fireball and the nearby air.
The pressure gradients consist of the vertical hydrostatic pressure gradient and the pressure gradient associated with the shock wave which is reflected upward from the ground.
The boundary layer developed in a slight favorable pressure gradient on a 1.2 m chord plate within the 61 cm× 61 cm test section of a low-speed wind tunnel.
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