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expansion tunnel
Expansion and shock tunnels are aerodynamic testing facilities with a specific interest in high speeds and high temperature testing. Shock tunnels use steady flow nozzle expansion whereas expansion tunnels use unsteady expansion with higher enthalpy, or thermal energy. In both cases the gases are compressed and heated until the gases are released, expanding rapidly down the expansion chamber. The tunnels reach speeds from Mach 3 to Mach 30 to create testing conditions that simulate hypersonic to re-entry flight. These tunnels are used by military and government agencies to test hypersonic vehicles that undergo a variety of natural phenomenon that occur during hypersonic flight.〔Stalker R.J."Modern developments in hypersonic wind tunnels,"The Aeronautical Journal January 2006〕
== Expansion Process ==
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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