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以某型煤油燃料超燃冲压发动机整机模型为研究对象,对发动机外流场的流动与发动机内的流动燃烧过程开展了耦合三维数值模拟研究.燃烧室壁面静压计算结果与实验数据吻合良好,平均相对误差为4.9%,验证了数值方法的有效性.结果表明:内流场的流动燃烧状况既受到外流场捕获空气流量的限制,又会反过来影响着外流场的激波结构;泄压孔对保持发动机中各部件流量匹配起到关键作用;由于进气道内激波与边界层的相互作用以及泄压孔诱发的斜激波的影响,流场在第1处燃油喷射孔附近呈现出燃烧流场不对称特征.
Taking the whole model of a kerosene-fuel scramjet engine as a research object, the coupled three-dimensional numerical simulation of the flow field in the engine and the flow in the engine was carried out. The calculation results of wall static pressure in the combustion chamber agree well with the experimental data , And the average relative error is 4.9%, which verifies the validity of the numerical method. The results show that the flow combustion in the internal flow field is limited by the trapped air flow in the outflow field, which in turn affects the shock wave structure in the outflow field ; Pressure relief hole to maintain the engine flow matching the various components play a key role; due to the shock in the inlet and the boundary layer interaction and the pressure relief hole induced oblique shock, the flow field in the first fuel injection hole Near the combustion flow field shows the asymmetric characteristics.