Abstract: Taking into account the configuration or aerodynamic heating, most hypersonic flight vehicles have to use the blunt-nosed body. A strong bow shock forms ahead of the blunt nose to introduce a rather high shock drag in supersonic flow，especially in hypersonic flow，that affects the aerodynamic performance of the vehicles seriously. A spike mounted on a blunt-noised body pushes the strong bow shock away from the body surface, which forms recirculation flow with low pressure ahead of the body surface, and then decreases the drag. The drag reduction effects of spikes in high supersonic and hypersonic flows are validated through experimental and numerical methods. In order to analyze the influence of spike on aerodynamic characteristics of blunt-nosed body in supersonic(Ma=1.5) flow, the numerical studies are carried out. The design optimization of spike shape is carried out based on Kriging model and genetic algorithm.

Key words: ordnance science and technology, spike, drag characteristic, shock wave, Kriging model, optimization