Controllable initiation characteristics of the oblique detonation wave in a combustor with a confined cone of a novel structure

摘要

The reliable and controllable initiation of the oblique detonation wave at an appropriate location is vital to maintain the optimal thrust of the propulsion systems. A novel structure is proposed in the current research to dynamically control the initiation of the oblique detonation wave in a combustor with a confined cone. The novel structure is based on the traditional single cone, of which the cone angle is theta(0). The novel cone utilizes a leading cone with a smaller cone angle (theta(1)) + a larger rear cone angle (theta(2)), where theta(1) theta(0) theta(2). A parametric study is conducted based on reactive Euler equations to test the performance of the novel structure on detonation initiation. It is found that the oblique detonation can be stabilized with less total pressure loss and less drag force under a wide range of Mach numbers. It is found that an 'internal reflection' of the rear shock wave exists in the first and second reflection of the leading shock wave. The 'internal reflection', which has not been reported before, enhances the temperature elevation and pressure elevation in the induction region of the oblique detonation wave. A possible strategy of dynamic control based on the novel structure is proposed. The force exerted on the rear cone is different under different Mach numbers, pushing the rear cone to a state of a certain cone angle. The novel structure performance very well for controllable initiation of the oblique detonation wave. (c) 2020 Elsevier Masson SAS. All rights reserved.