关键词: 曲面激波;斜爆轰;诱导;燃烧波;数值模拟

Abstract: Numerical simulations were performed on the oblique detonation wave structures and features induced by hypervelocity conical projectile and wedge while passing through premixed stoichometric hydrogen-air flowfield based on Navier-Stokes equations considering chemical reaction. The numerical methods used here were Steger-Warming scheme for the convection fluxes discretization and second-order Runge-Kutta iterate for time discretization. Results show that, for the projectile： (1) under subdetonative speed condition, the method mentioned above and the grid can describe the fine detonation structure， (2) under superdetonative speed condition, the strongly coupled shock and combustion wave can be resolved with carefully adapted mesh, well in accordance with Lehr’s experimental data. For the wedge detonation, distinct triple point and complicated oblique detonation structure can be captured, the predicted induction distance, shock wave angle and oblique detonation angle are in consistent with experiment data; the evolution process of the oblique detonation wave is represented based on the method mentioned above, and the variation of the triple point location with time is obtained.

Key words: Surface shock;Oblique detonation;Induce;Combustion wave;Numerical simulation