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数值模拟研究了主流偏角对单排圆柱型气膜孔冷却特性的影响,在气膜孔中心间距相等的计算条件下,在吹风比为1.0时,计算结果与主流和气膜孔都无偏角、主流无偏角而气膜孔有45°偏角这两种流动情况做了对比.结果显示:相对于主流和气膜孔都无偏角时,主流有45°偏角而气膜孔无偏角时气膜平均冷却效率更大,分布更均匀;相比于主流无偏角而气膜孔有45°偏角时,在气膜孔附近处,主流有45°偏角而气膜孔无偏角时气膜平均冷却效率更小,在远离气膜孔的下游位置处,气膜平均冷却效率更大.另外在吹风比为0.5和1.5条件下进行了数值模拟,结果也显示3种流动情况气膜冷却效率分布存在明显差距,有必要对主流偏角对单排气膜孔冷却特性的影响做进一步的实验和数值研究.
The influence of the mainstream declination angle on the cooling characteristics of single-row cylindrical gas-film holes was investigated by numerical simulation. When the blow-hole ratio was 1.0, the calculation results were in good agreement with those of the mainstream and the film holes , The mainstream without offset angle and the angle of 45 ° declination have been compared.The results show that: relative to the mainstream and the film hole are no off-angle, the mainstream has a 45 ° declination and the film hole unbiased When the angle of the average cooling air film more efficient, more evenly distributed; compared to the mainstream of non-off-angle and the air film hole has a 45 ° declination, near the film hole, the mainstream has a 45 ° declination and no film hole The average cooling efficiency of the gas film is smaller when the declination angle is smaller, and the average cooling efficiency of the gas film is greater at a position far away from the film hole. In addition, the numerical simulation is performed under the blow ratio of 0.5 and 1.5, In the case of gas film cooling efficiency, there is a significant gap in the distribution. It is necessary to do further experimental and numerical studies on the influence of the main stream declination on the cooling characteristics of single-hole film holes.