The primary focus of the present study is to investigate the impact of anti-vortex holes design on the film-cooling performance in a film-cooled rotor blade model using the large eddy simulation method (LES). One row of the film holes was positioned on the pressure surface of the rotor blade. This row had three cylindrical holes (the main hole in the present study) with a diameter (D) of 4 mm and a tangential injection angle of 28 deg. Each main hole supplemented with the addition of two symmetrical side holes (anti-vortex holes), which branch out from the same main hole. Three positions for the anti-vortex side holes were considered; namely: upstream to the outlet of the main hole; in line with the main hole; and downstream of the main hole. The Reynolds number was fixed at Re = 1.92 × 10⁵ and the speed of the rotor blade was taken to be 1800 rpm. The blowing ratio varied from 1.0 to 5.0 and the density ratio of coolant to mainstream was 2.0. Compared to the base hole, the film cooling performance of the all anti-vortex cases showed obvious improvement at all blowing ratios. The middle stream side holes and downstream side holes each demonstrated good film cooling performance at all blowing ratios, while the upstream side holes perform well only at a lower blowing ratio. The presence of side holes can restrain the CRVP (counter rotating vortex pairs) intensity of the main hole and reduce the coolant lift-off, improving the film coverage and film cooling effectiveness. The downstream side holes can perform better in reducing the CRVP intensity.

本研究的主要重点是使用大涡流仿真方法（LES）研究反涡孔设计对膜冷却转子叶片模型中膜冷却性能的影响。一排薄膜孔位于转子叶片的压力面上。该行具有三个圆柱孔（本研究中的主要孔），直径（D）为4毫米，切向喷射角为28度。每个主孔补充了两个对称的侧孔（防涡流孔），它们从同一主孔分支出来。考虑了防涡流侧孔的三个位置。即：主孔出口的上游；与主孔对齐；在主孔的下游 雷诺数固定为Re = 1.92×10 ^5，并且转子叶片的速度设为1800 rpm。吹风比从1.0到5.0不等，冷却剂与主流的密度比为2.0。与底孔相比，所有防涡壳的薄膜冷却性能在所有吹塑比下均显示出明显的改善。中流侧孔和下游侧孔在所有鼓风比下均表现出良好的膜冷却性能，而上游侧孔仅在较低的鼓风比下表现良好。侧孔的存在可以限制主孔的CRVP（反向旋转涡流对）强度，并减少冷却液的剥离，从而改善薄膜覆盖率和薄膜冷却效率。下游侧孔在降低CRVP强度方面表现更好。