为了优化设计复合角射流的异形孔几何参数，数值模拟研究了涡轮叶片吸力面不同出口宽度的燕尾孔气膜效率。数值模拟结果和实验数据吻合的较好，平均误差小于20%。出口宽度增加使燕尾孔出口展向速度不均匀度增加，无法形成较好的展向扩散，导致气膜效率减小。随着吹风比的增加，燕尾孔气膜效率随出口宽度增大而降低的趋势更加明显。吹风比Br=1.0时，出口宽度1.5倍圆柱段直径的燕尾孔气膜效率相比于出口宽度2.0倍圆柱段直径的燕尾孔提高13%，出口宽度从2.0倍圆柱段直径增加到2.5倍，气膜效率变化小于1%；吹风比Br=1.5时，出口宽度为1.5倍圆柱段直径的燕尾孔气膜效率相比于出口宽度2.0倍和2.5倍圆柱段直径的燕尾孔气膜效率分别提高40%和51%；吹风比Br=2.0时，出口宽度1.5倍圆柱段直径的燕尾孔气膜效率相比于出口宽度为2.0倍和2.5倍圆柱段直径的燕尾孔分别提高38%和62%。

In order to optimize the geometric parameters of special-shaped holes with compound angle jet, numerical simulation was conducted to study the film effectiveness of dovetail holes with different outlet widths on the suction surface of turbine blades. The numerical results were in good accord with the experimental data, in which the difference is less than 20%. With the increase of outlet widths, the unevenness of velocity in the spanwise direction of the dovetail hole increases, which is adverse to the spread of the jet and reduces the film effectiveness. As the blowing ratio increases, the film effectiveness of the dovetail hole decreases more significantly with the increase of outlet width. At the blowing ratio of 1.0, the film effectiveness of the dovetail hole with an outlet width of 1.5 times the diameter of the cylindrical section is 13% higher than that of the dovetail hole with an outlet width of 2.0 times the diameter of the cylindrical section. The outlet width increases from 2.0 times the diameter of the cylindrical section to 2.5 times, the difference of film effectiveness is less than 1%; At the blowing ratio of 1.5, the film effectiveness of the dovetail hole with an outlet width of 1.5 times the diameter of the cylindrical section is increased by 40% and 51%, compared to the dovetail hole with an outlet width of 2.0 times and 2.5 times the diameter of the cylindrical section; At the blowing ratio of 2.0, the film effectiveness of the dovetail hole with an outlet width of 1.5 times the diameter of the cylindrical section is 38% and 62% higher than that of the dovetail hole with an outlet width of 2.0 times and 2.5 times the diameter of the cylindrical section.

国家自然科学基金; 辽宁省自然科学基金