进气横流对前缘冲击流量系数的影响

对靶面为圆弧面的单孔前缘冲击流量系数进行了实验测量,通过改变进气横流和单孔射流间的速比大小来模拟一排冲击孔中各孔实际所感受横流的不同。研究了孔雷诺数和进气横流速比对流量系数的影响,孔雷诺数范围:1.5×104~4.0×104,横流速比范围:0~0.3。结果显示冲击孔流量系数随孔雷诺数的增大而增大,最大增幅7%左右;随横流速比的增大而线性减小,最大减幅15%左右。由实验数据得到了冲击孔流量系数分别与孔雷诺数和横流速比的经验关系式。

Effect of inlet crossflow on the discharge coefficient of leading edge jet impingement

The discharge coefficient of a single hole jet impingement on a circular target surface was measured.The velocity ratio of inlet crossflow to jet flow was changed from 0 to 0.3 for jet Reynolds number in the rang 15,000 to 40,000,simulating the different magnitude of inlet crossflow at each of a row of impingement holes encountered in a real engine leading edge impingement cooling scheme.The effect of inlet crossflow velocity ratio and jet Reynolds number on the discharge coefficient was investigated.The results show that the discharge coefficient of jet impingement increase with jet Reynolds number,with the maximal increment of about 7%,and decrease with inlet crossflow velocity ratio,with the maximal decrement of about 15%.Correlations between jet Reynolds number and discharge coefficient,and between inlet crossflow velocity ratio and discharge coefficient were obtained based on the experimental data.