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Supersonic vs subsonic closed system1/2/2024 ![]() This problem is solved using quite a number of structural components some of which are depicted in Figures 1, 2, and 3. ![]() Simulation of body motion in a quiescent medium requires establishing in a wind tunnel a uniform gas or liquid flow with equal and parallel velocity vectors at all points of the working space and with identical values of gas temperature and density. Under these conditions the stream force and heat effect on a body are identical in both direct and reverse motion. In mechanics, this is known as the Galileo principle and is applicable, strictly speaking, only to the case of a uniform rectilinear motion. A special class of wind tunnels with heaters is used for estimating heat loads applied to the surface of the body in the flow and in developing heat protection techniques.Įxperiments in wind tunnels are based on the principle of motion reciprocity according to which displacement of a body relative to gas or liquid can be replaced by gas or liquid flow around the body at rest (see Aerodynamics). Wind tunnels are used to determine aerodynamic resistance forces of bodies, to investigate their stability and controllability, and to determine vehicle and building dynamic loads due to explosion waves and gusts. ![]() ![]() Wind tunnels are experimental setups producing an air or gas stream for investigation of flow around models representing, for instance, vehicles or buildings. ![]()
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