鼓包诱导斜爆震波的数值研究

In order to implement fast initiation of oblique detonation wave at low Mach numbers and to improve its capability of resisting disturbance to unsteady inflow, an idea of controlling initiation of oblique detonation wave by setting a small bump within its induction zone was proposed. Numerical simulations of oblique detonation waves induced by wedges and bumps were carried out by solving the two-dimensional multi-species Euler equations. Results show that initiation acceleration of oblique detonation wave can be implemented by setting a bump within the induction zone, and the initiation location keeps relatively fixed for a relative wide range of Mach number. There exist two initiation patterns for bump-induced oblique detonation wave, namely the strong coupled initiation and weak coupled initiation, depending on the location relationship between the bump and the oblique shock wave. Further, severe oscillation of wedge-induced oblique detonation wave would be induced by inflow disturbance, which is disadvantageous to the stable operation of oblique detonation engine. A certain inhibitory effect on the oscillation of oblique detonation wave induced by inflow disturbance can be observed with the inclusion of a bump.