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Gun Tunnel
The Gun Tunnel is an intermediate altitude Hypersonic wind tunnel that can be configured to produce hypersonic flows at roughly 30 to 40 km altitude.This uses a piston for isentropic compression,the hypersonic facility at IISC bangalore India has a high enthalpy gun tunnel, which can produce Schlieren imaging and produce up to 8 mega joules of energy,using a piston can be very tricky,Due to reflecting of shocks.At the facility they use alluminium diaphragm to produce shocks and paper diaphragm to avoid shocks and pass through the hypersonic chamber.The pressure used is significantly higher like 30 times the atmosphere.〔http://www.aero.iisc.ernet.in/~lhsr/web/shocktunnels.htm〕
==References==
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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