Parametric Study of Heat Release Preceding a Blunt Body in Hypersonic Flow

A computational parametric study is presented illustrating the effects of upstream heat release on drag and heating rate in hypersonic e ow over an axisymmetric blunt body. A chemical nonequilibrium viscous e ow is consideredwith seven species;Park’ stwo-temperaturemodelisalso used to takeaccountofthermally nonequilibrium phenomena. Three parameters that control the heat release are introduced, and their effects on the e ow structure, specie cally with respect to drag and heating rate, are quantie ed. Results show that heat release upstream of the body can reduce not only the aerodynamic drag but also the aerodynamic heating rate at the body surface. Computedresultsachieved areductionof23%in drag and 74%in heating rate,relativetobaselinevaluesintheabsence of heat release. The reduction mechanism is discussed, and dynamic pressure is shown to play an important role in the drag reduction mechanism.

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