燃料分布对旋转爆震波传播特性影响

为定量研究燃料分布对旋转爆震波传播特性的影响，针对两种环缝/小孔喷注方案开展了数值和实验研究。针对燃料(H2)和氧化剂(air)分开喷注的旋转爆震燃烧室模型，开展冷流掺混的三维数值模拟研究，给出了掺混均匀度评价参数，获得了两种喷注模型的反应物掺混均匀度沿轴向的变化规律。针对这两种喷注模型，开展旋转爆震波传播特性实验研究，分析了旋转爆震波的传播速度、工作稳定性、当量比边界等。研究结果表明:将燃料喷注小孔前移，可大幅提高燃烧室头部的掺混均匀度；随着掺混均匀度的提高，旋转爆震波的传播速度增加，传播稳定性明显提高，稳定工作的当量比下限从1.08拓宽至0.57。研究结论可为旋转爆震发动机喷注结构设计提供参考。 

Effects of fuel distribution on propagation of rotating detonation wave

To study the effects of fuel distribution on the propagation of rotating detonation wave, two injection schemes of H2/air were investigated by simulations and experiments. The mixing of H2 and air was simulated in rotating detonation chamber, and homogeneity degree was proposed to quantitatively evaluate the mixing. The relationship of homogeneity degree and axial distance was revealed for the two injection schemes. Rotating detonation wave was studied by experiments, and its propagation velocity, stability and equivalent ratio limit were analyzed for the two injection schemes. The results indicated that the homogeneity degree increased significantly in the front portion of chamber when fuel injection holes moved forward. With the increase of the homogeneity degree, the propagation velocity and stability of rotating detonation wave were dramatically increased, and the lower limit of equivalent ratio expanded from 1.08 to 0.57. These results can provide references for the design of injection schemes of rotating detonation engine.