SKIN-FRICTION AND HEAT-TRANSFER CALCULATIONS ON ABLATING AXISYMMETRIC VEHICLES.

Abstract

An engineering boundary-layer code that accounts for combined surface roughness and mass addition has been developed. The boundary-layer method is an extension of the law-of-the-wall technique of F. M. White and G. H. Christoph. Two coupled, ordinary differential equations for skin friction and heat transfer are derived. No integral thicknesses are needed, but they can be calculated if desired. Real-gas and entropy-swallowing effects are accounted for in the code. Calculations are in good agreement with NSWC skin-friction data for compressible flow with surface roughness alone, blowing alone, and combined roughness and blowing.