Three-Dimensional Viscous Shock-Layer Analysis of Laminar or Turbulent Flows in Chemical Equilibrium

摘要

A method has been developed to predict three-dimensional hypersonic laminar or turbulent shock-layer flows for perfect gas or equilibrium air. A two-layer eddy-viscosity model is used for the turbulent regime. The thermodynamic and transport properties for air are obtained by interpolation within a two-dimensional stable or from curve-fit data. Comparisons are made for air in chemical equilibrium and perfect gas for a seven-degree half-angle spherically blunted cone at various flight altitudes with a cold, moderately cool and an adiabatic wall for angles of attack up to twenty degrees. Wall heat transfer, wall pressure, force and moment coefficients and execution times are compared for some sample cases. This method can be used to predict viscous flow in chemical equilibrium over axisymmetric reentry vehicles at angles of attack up to 25 degrees. (Author)