Numerical investigation of aerothermodynamic in a reentry vehicle with surface discontinuity-like cavity / Investigação numérica da aerotermodinâmica de veículos na reentrada com imperfeições na superficie do tipo cavidade

AUTOR(ES)

Rodrigo Cassineli Palharini

DATA DE PUBLICAÇÃO

2010

RESUMO

In the design of hypersonic vehicles, the knowledge of factors that affects the thermal and aerodynamic loads acting on the vehicle surface becomes imperative. Usually, in the thermal load calculations, the analysis assumes that the vehicle has a smooth surface. However, discontinuities or imperfections are present on the surface of reentry vehicles. In this scenario, a numerical study was performed with the purpose to examine the impact of cavities on the flowfield structure and on the aerodynamic properties on the reentry vehicle surfaces, under conditions of rarefied hypersonic flow. The calculations were performed with a robust computer code that takes into account for the effects of thermodynamic non-equilibrium. A detailed description of the impact on the flowfield properties - velocity, density, pressure and temperature - as well as the aerodynamic properties on the surface - number flux, heat transfer, pressure and skin friction - is presented at the vicinity of the cavities due to variations in the width-to-depth ( extit{L /H}) ratio. The analysis showed that the recirculation region inside the cavities is a function of the extit{L /H} ratio. It was found that, for extit{L /H} < 3, the cavity flow structure represented that one observed in a "open cavity". Conversely, for extit{L /H} = 4, the cavity flow structure corresponded to that of a "closed cavity". In contrast, for the aerodynamic quantities acting on the cavity surface, it was found that the pressure load and the heat load presented the maximum values along the cavity downstream faces, more precisely, at the shoulder of the cavities. In addition, these loads are much larger than those attained in a smooth surface.

ASSUNTO(S)

aerothermodynamic direct simulation monte carlo method (dsmc) rarefied hypersonic flow atmospheric reentry cavity aerodynamic heating aerotermodinâmica dsmc escoamento hipersônico rarefeito reentrada atmosférica cavidade aquecimento aerodinâmica

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