Numerical study on the influence of jet on the stability of oblique detonation waves in confined space

Abstract In confined spaces, due to various interfering factors, oblique detonation waves inevitably reflect off the walls, resulting in the formation of a Mach stem. When the Mach reflection is excessively strong, it can lead to the instability of the oblique detonation waves. Therefore, it is necessary to study the stability characteristics of the reflected wave system. Based on a simplified combustor-nozzle model, this paper studies the effects of jet injection on the stability of oblique detonation waves in confined space. The results indicate that injecting a jet on the wedge surface reduces the angle of the oblique detonation waves, decreases the intensity of Mach reflection, and enhances the stability of the wave structures. The oblique detonation waves induced by jets of varying pressure exhibit different characteristics. Compared to a hot jet, cold jet can induce a stronger shock wave at the same pressure. Both excessively high or low jet pressure can lead to a reduction in the stability of the wave structures.