基于特征线理论的旋转爆震流场结构特征研究

特征线理论及其计算方法是气体动力学的经典理论与方法，应用于旋转爆震流场分析具有简单高效的特点。将坐标系建立在爆震波上，对旋转爆震流场进行简化，采用特征线理论并结合流场计算单元过程，建立旋转爆震流场计算模型。研究了当量比和喷注参数对氢气/空气、甲烷/空气以及辛烷/空气3种不同预混气的旋转爆震流场结构特征的影响。结果表明:爆震波高度和倾斜角度受混气当量比和喷注总温影响明显；燃料由小分子氢燃料变为大分子碳氢燃料时，爆震波高度和倾斜角度逐渐减小；混气当量比和喷注总温主要通过影响爆震波传播速度、高度和倾斜角度而影响爆震波后宏观流场特征趋势。

Investigation on flow field structure of rotating detonation using the method of characteristics

The characteristics theory and the corresponding calculation methods are classical methods of gas dynamics, which have high computational efficiency in the rotating detonation flow field analysis. The analysis of the rotating detonation flow field is simplified in the wave-fixed reference frame, and the steady-state flow field calculation method is established by using the method of characteristics and the unit processes. The effect of the equivalence ratio and the plenum stagnation conditions on the rotating detonation flow field structure of premixed hydrogen/air, methane/air and octane/air is studied. The calculated results show that the detonation wave height and inclination angle are significantly affected by the equivalence ratio and the stagnation temperature, and decrease as the fuel changing from the small molecule hydrogen to the macromolecular hydrocarbon. The equivalence ratio and the stagnation temperature mainly affect the macroscopic flow field structure by affecting the propagation velocity, height and inclination angle of the detonation wave.