The initiation and stabilization features of oblique detonation wave (ODW) in kerosene-air premixing flows are investigated numerically based on the Navier-Stokes equations with a two-step reaction model. The effects of fuel-air equivalence ratios and inflow Mach numbers are considered by a parametric study. The present results indicate that the dependence of ODW initiation distance for kerosene fuel with high density on the equivalence ratio, ${\Phi }_0$, is quasi-linear, which is different from the previous study on the low-density fuel such as hydrogen, but the local transition pressure from the oblique shock wave (OSW) to ODW is non-linear with a critical equivalence ratio around 1.0. In particular, as the equivalence ratio increases from the fuel-lean to fuel-rich conditions, the transition pattern from the OSW to ODW varies: a smooth transition with a curved shock shifts to an abrupt one with a multi-wave point, and the initiation distance decreases, associated with the increase of transition pressure and the unstable detonation front. These are due to combined effects of the increasing inflow Mach number and the increasing fuel-rich mixtures for the exothermic reaction. The former accelerates the chemical reaction rate due to the increase of pressure/temperature of the post-OSW flow, and the latter enlarges the heat release. In particular, a double-ODW wave structure occurs for the fuel-rich mixture with ${\Phi }_0=1.4$, since the inflow reactive mixture cannot be consumed as it crosses the first ODW, resulting in a downstream second ODW. The increasing inflow Mach number results in the acceleration of ODW initiation and stabilizes the ODW within the inflow conditions in this study.

基于Navier-Stokes方程和两步反应模型，数值研究了煤油-空气预混流中斜爆轰波（ODW）的起爆和稳定特征。参数研究考虑了燃料-空气当量比和流入马赫数的影响。目前的结果表明，高密度煤油的ODW起始距离对当量比的依赖性，${\Phi }_0$，是准线性的，这与以前对低密度燃料（例如氢）的研究不同，但是从斜向冲击波（OSW）到ODW的局部转变压力是非线性的，临界当量比约为1.0。特别是，当当量比从稀油状态到富油状态增加时，从OSW到ODW的过渡模式会发生变化：具有弯曲冲击的平滑过渡会转变为具有多波点的突变过渡，并且起始距离减小，这与过渡压力的增加和不稳定的爆轰锋有关。这些是由于流入马赫数增加和放热反应增加的富燃料混合物共同作用的结果。前者由于OSW后流的压力/温度增加而加快了化学反应速度，后者增加了热量的释放。特别是，对于富含燃料的混合气，会产生双ODW波结构${\Phi }_0=1.4$，因为流入的反应性混合物穿过第一ODW时无法被消耗掉，从而导致下游出现第二ODW。在这项研究中，增加的流入马赫数导致ODW引发的加速，并使ODW稳定在流入条件内。