Skin-Friction Prediction for High-Speed Turbulent Boundary Layers with Ablation

摘要

In this Note, a new computational method for the prediction of the skin friction for high-speed turbulent boundary layers with ablation is described. The method calculates the skin friction by making use of the existing validated experimental correlations developed for surfaces with roughness and for surfaces with mass blowing, respectively. Results have been presented for high-speed turbulent boundary layers over a flat plate. When compared with the available measurement, the results obtained by using the present method agree well with the data. The computational procedures involved are algebraic operations and can readily be implemented into prediction software currently used in the research community and in industry. For instance, it may provide the much-needed wall-boundary conditions for computational fluid dynamics studies of high-speed flows with surface ablation. The formulations can also be extended to examine additional aerothermodynamics effects, such as angle of attack, rotation, and surface heat transfer at high speeds. Note that, since the methodology is not fundamentally generic, detailed validations or modifications of the correlations may be needed when the present method is applied to problems with, for example, geometric variation to the test cases.