Influence of incoming flow velocity and mixture equivalence ratio on oblique detonation characteristics

Abstract

In order to reveal the influence of incoming flow velocity and mixture equivalence ratio on the characteristics of oblique detonation, Euler equations coupled detailed chemical reaction model were used to numerically simulate the flow field of oblique detonation. We investigated the characteristic parameters and the morphology of oblique detonation with different wedge angles, velocities and mixture equivalence ratios of incoming flow. The results show that the variations of parameters for uniform inflow condition have obvious influence on the structure of the wave system and the internal stabilization of the oblique detonation flow field. With the increase of incoming flow velocity, the instability of oblique detonation flow field is suppressed. And the initiation position of the oblique detonation is advanced. Under the condition of high velocity inflow, the performance of oblique detonation propulsion is obviously improved. With the increase of the mixture equivalence ratio of inflow, the change law of oblique detonation initiation distance is U-shaped. The internal flow field of the oblique detonation becomes stabilized with the increase of excess oxygen. For the inflow equivalence ratio inhomogeneity, the deflagration front and oblique detonation front become distorted. In addition, the flow field properties of oblique detonation can be optimized by adjusting the inhomogeneity of equivalence ratio.