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A supersonic wind tunnel is a wind tunnel that produces supersonic speeds The Mach number and flow are determined by the nozzle geometry. The Reynolds number is varied by changing the density level. Therefore, a high pressure ratio is required. Apart from that, condensation of moisture or even gas liquefaction can occur if the static temperature becomes cold enough. This means that a supersonic wind tunnel usually needs a drying or a pre-heating facility.A supersonic wind tunnel has a large power demand, so most are designed for intermittent instead of continuous operation.
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