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Supersonic wind tunnel : ウィキペディア英語版
Supersonic wind tunnel

A supersonic wind tunnel is a wind tunnel that produces supersonic speeds (1.2<M<5)
The Mach number and flow are determined by the nozzle geometry. The Reynolds number is varied by changing the density level (pressure in the settling chamber). Therefore a high pressure ratio is required (for a supersonic regime at M=4, this ratio is of the order of 10). 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 that most are designed for intermittent instead of continuous operation.
==Restrictions for supersonic tunnel operation==


抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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