斜激波与反应性气体界面作用的数值模拟

Numerical Simulation on Interaction Between Oblique ShockWave and Reactive Gaseous Interface

In order to solve the unstart during the acceleration of the new concept ram accelerator,the stratified charging concept in the accelerating tube was proposed,and the interaction between an oblique shock wave and a reactively stratified gaseous interface was used to achieve normal start of the device. The numerical simulations with high-resolution scheme were carried out for the interaction. The effects of different inflow velocities(intensity of oblique shock wave)and the filling amount of combustible premixed gas on the interaction process were studied. The time scale conditions of the combustion process during the process were proposed,and the thrust performances under different inflow velocities were estimated. The results show that the higher inflow velocity and more filling amount of flammable premixed gas are in favor of the occurrence of ignition. Both the chemical reaction and the gas interface instability affect whether the ignition occurs. When the delay time scale of chemical reaction is smaller than the flow time scale,the ignition occurs. The flow field of combustion can be featured by a special mode in which the detonation wave and the non-premixed flame interface coexist. Under the conditions of higher inflow velocity,the thrust performance of the combustion field is higher and more stable.