圆盘旋转爆震燃烧室中爆震波传播模态

本文的目的在于通过求解14组分19步CH4/O2反应的欧拉方程去研究燃料喷射温度、压力、燃烧室内外直径比值和燃烧室径向长度对圆盘结构下旋转爆震传播模态的影响。研究表明，只有预混气喷射温度范围为500-900K，喷射压力范围为0.5-3.5MPa的条件下能够在固定燃烧室内形成连续的旋转爆震波。受燃烧室结构影响，旋转爆震波的传播模态分为稳定模态和非稳定模态。整个非稳定传播模态根据爆震波对前周期的干涉又可以分为干涉阶段和不干涉阶段。在不干涉阶段，爆震波传播速度略高于Chapman-Jouguet (CJ)速度；在干涉阶段，爆震波传播速度低于CJ速度且爆震波被间断面分割成两部分。非稳定模态爆震波传播速度小于稳定模态，而爆震波夹角、燃烧室出口面积比则反之。

Propagation Mode of Detonation Wave in a Plane-Radial Rotating Detonation Combustion Chamber

The purpose of the paper is to study the effect of injection temperature, pressure, inlet and outer diameter ratio and radial length on the propagation mode in a plane-radial rotating detonation combustor. Numerical simulations were conducted with the Euler equation and 14 species-19 reactions methane/oxygen reaction mechanism. The results show that a continuous rotating detonation wave is formed in the fixed combustion chamber when the pre-mixed injection temperature range of 500-900K and the injection pressure range of 0.5-3.5MPa. With the effect of the combustor structure, propagation modes of rotating detonation waves are divided into stable mode and unstable mode. The entire unstable propagation mode can be divided into two stages based on the interference of the detonation wave to the previous period: the interference stage and the non-interference stage. In the non-interference stage, the propagation speed of the detonation wave is higher than the Chapman-Jouguet (CJ) speed. In the interference stage, the propagation speed of the detonation wave is lower than the CJ speed, and the detonation wave is divided into two parts by the discontinuous surface. The propagation speed of the detonation wave in the stable mode is higher than that in the unstable mode, while the angle of detonation wave and combustor outlet area ratio are reversed.