In this numerical study, the supersonic combustion of ethylene in three model combustor configurations namely, baseline (no cavity), square cavity and inclined cavity are investigated. To this end, 3D, compressible, turbulent, non-reacting (with fuel injection) and reacting flow calculations using single step and 10-step chemical kinetics in conjunction with a one equation turbulence model have been carried out. In the mixing study, predictions of the flow features with fuel injection, fuel trajectories, contours of total pressure loss along the combustor are compared between the combustor models. In the combustion study, contours of heat release are compared across the combustor models. Overall performance metrics such as mixing efficiency, total pressure loss and combustion efficiency are also compared between the combustor models. The comparison of combustor top wall static pressure and exit total pressure predictions with experimental data reported in the literature are also presented and discussed. The results clearly show that the model combustor with a shallow and inclined aft wall cavity has the highest residence time and maximum heat release. In addition, the role of a smaller L/D ratio cavity is shown to be minimal on the predictions of residence time and the heat release.

在此数值研究中，研究了乙烯在三种模式燃烧室构型中的超声燃烧，即基线（无腔），方腔和倾斜腔。为此，已经使用单步和十步化学动力学结合一个方程式湍流模型进行了3D，可压缩，湍流，不反应（带燃料喷射）和反应流计算。在混合研究中，在燃烧器模型之间比较了燃料喷射，燃料轨迹，沿着燃烧器的总压力损失等高线的流动特征预测。在燃烧研究中，比较了各个燃烧器模型的放热轮廓。在燃烧器模型之间还比较了诸如混合效率，总压力损失和燃烧效率之类的总体性能指标。还介绍和讨论了燃烧室顶壁静压和出口总压预测与文献中报道的实验数据的比较。结果清楚地表明，具有浅且倾斜的后壁腔的模型燃烧器具有最长的停留时间和最大的热释放。此外，在预测停留时间和放热时，较小的L / D比腔的作用已显示为最小。