Heat transfer to axisymmetric bodies in super- and hypersonic turbulent streams

Abstract

An analysis of the effects of freestream turbulence on heat and momentum transfer to axisymmetric bodies in super- and hypersonic turbulent streams has been performed. Real air density, viscosity, and Prandtl number were taken variable across the boundary layer. Results were obtained for a range of f reestream Mach number, total pressure, total temperature, and intensity of turbulence, as well as wall temperature. The results confirm previous findings that heat transfer to the surface can be enhanced markedly by turbulence in the f reestream, the effect being more pronounced at lower Mach numbers and higher total pressures. The magnification in heat transfer is less pronounced at higher total temperature and lower wall temperature as a result of variable property effects. In arc-heated jet facilities environments, freestream turbulence is shown to be a major contributor to the so-called enthalpy spike. Discrepancies between enthalpies inferred from null point calorimeters and those derived from system overall energy balances are predicted.