Abstract
Most of the previous studies focus on oblique detonation wave (ODW) produced by an infinite/finite straight wedge; however, there is a lack of research on ODWs induced by a convex or concave curved surface. In this paper, the initiation characteristics of oblique detonation waves induced by a curved surface are studied, the two-dimensional (2D) multi-species Euler equations with a detailed chemical reaction are solved. The effects of the shape and position of the curved surface on the initiation characteristics of the ODW are investigated. The numerical results demonstrate that the wedge with a convex circular arc-surface generates the expansion waves, which makes the shock wave and the combustion wave decoupled and the ODW will not to be initiated. The wedge with a concave circular-arc surface produces the compression waves and promotes the initiation of the ODW. As the curvature of the concave surface becomes greater, the compression waves become stronger, the length of the induction zone gets shorter and the ODW is easy to be initiated. Decreasing the length of the straight wedge makes the compression wave move upstream and the detonation position move forward, it makes the characteristic length of the induction zone decrease.
Published Version
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