A Novel Method for the Estimation of the Zero-Lift Forebody Pressure Drag of Axisymmetric Non-Slender Shapes at Supersonic and Hypersonic Velocities

摘要

The method described in this paper uses the novel approach of first predicting the shape of the bow shock wave and then using this to calculate the drag through a computation of the total rate of entropy production due to the bow shock wave. Both blunted and sharp forebodies can be treated in this way and comparison with experimental data shows that drag predictions .with a typical accuracy of 5% are readily achieved. The method has been expressly developed to be economical in its use of computer time so as to allow of its repetitive use in optimisation studies.