Numerical simulation of denotation wave induced by supersonic projectile using gridless method

The gridless method coupled with finite rate chemical model was developed to study the effects of conical angle on the structure of denotation shock induced by supersonic projectile. The fluid dynamics was modeled by multi-component Euler equations with chemical sources. The numerical flux was calculated by the multi-component HLLC (Harten-Lax-van Leer-Contact) scheme. A four-stage Runge-Kutta algorithm was employed to advance the equations in time. The flows of wedge-induced oblique denotation and shock-induced combustion were simulated to validate in respect of accuracy firstly. The denotation wave phenomena induced by supersonic projectile with different conical angles in the stoichiometric methane/air mixture were simulated subsequently. The contours agree well with the experimental shadowgraphs, and the results show that the oblique detonation wave is prone to be standing with conical angle at the range of 70°~100°, when the conical angle is not large enough, it does not avail to ignite combustible mixture, only oblique shock is found in the flow field, contrarily, the denotation wave would be detached. ©, 2015, Editorial Office of Journal of Propulsion Technology. All right reserved.