圆盘旋转爆震燃烧室中爆震波传播模态

为了研究圆盘结构下旋转爆震波传播特性,通过求解14组分19步CH4/O2反应的欧拉方程,数值模拟了不同燃料喷射温度、压力、燃烧室内外直径比值和燃烧室径向长度并分析了其对旋转爆震波传播模态的影响.研究表明,只有预混气喷射温度为500～900K,喷射压力为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....

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.