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A hypersonic wind tunnel is designed to generate a hypersonic flow field in the working section. The speed of these tunnels vary from Mach 5 to 15. As with supersonic wind tunnels, these types of tunnels must run intermittently with very high pressure ratios when initializing. Since the temperature drops with the expanding flow, the air inside has the chance of becoming liquefied. For that reason, preheating is particularly critical (the nozzle may require cooling). High pressure and temperature ratios can be produced with shock tube. ==Technological problems== There are several technological problems in designing and constructing a hyper-velocity wind tunnel: *supply of high temperatures and pressures for times long enough to perform a measurement *reproduction of equilibrium conditions *structural damage produced by overheating *fast instrumentation *power requirements to run the tunnel Simulations of a flow at 5.5 km/s, 45 km altitude would require tunnel temperatures of over 9000 K, and a pressure of 3 GPa (see discussion). 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Hypersonic wind tunnel」の詳細全文を読む スポンサード リンク
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