逆向进气复合角发散冷却孔流量系数试验

Experiment of discharge coefficient of counter inlet effusion cooling holes with compound angle

针对回流燃烧室外环壁面冷气与燃气流动方向相反的情况,试验研究了发散孔进气方向与环腔通道气流流动方向相反的条件下,复合角发散冷却孔流量系数随发散孔倾角(25°～55°)、偏角(90°～180°)及压降系数等参数的变化规律。研究结果表明:复合角发散孔的流量系数随倾角的增大而增大,随偏角的增大而减小;随着压降系数的增大,复合角发散孔的流量系数先呈近似线性增长,当压降系数大于0.95后,呈非线性增长且增长速度减缓。

The flow direction of air in the outer annulus passage of reverse-flow combustors was opposite to the flow direction of fuel gas.The discharge coefficient of compound angle effusion cooling holes was investigated under this condition.The investigation focused on how the discharge coefficient varied with inclined angles(25°-55°),orientated angles(90°-180°)and pressure drop coefficient.The results showed that the discharge coefficient of the effusion hole with compound angle increased with the increase of inclined angles,but decreased with the increase of the orientated angles.The discharge coefficient presented approximately linear rise with the increase of pressure drop coefficient first,and then grew nonlinearly when pressure drop coefficient was close to 0.95.