Abstract
The opposing jet has been proposed to reduce aerodynamic heating in hot hypersonic flow. In the present study, the availability of the opposing jet as a cooling system in high enthalpy flow was investigated experimentally. A free piston shock tunnel was used to obtain high enthalpy flow. Nitrogen and helium are used as the secondary flow. As a result of this experiment, the opposing jet was effective for reduction of aerodynamic heating. However, heat transfer depends on the condition of the opposing jet. Cooling effect has much to do with total pressure ratio between the main flow and the opposing jet, and high pressure ratio jet is necessary for heat transfer reduction at whole surface.
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