面对涡轮入口温度不断提升造成的日益增长的冷却需要,本文针对涡轮叶片前缘,提出了一种抑制积聚横流对射流冷却消极影响的回流式冲击冷却结构。采用CFD数值计算方法,通过对多种泄流孔排布形式的数值计算结果进行对比与分析,探究基于此回流式冷却结构下泄流孔的抽吸作用对冷却结构流动和换热特性的影响。研究发现:泄流孔的加入对射流冲击流场产生重构,一定程度抑制了壁面射流的发展,对冲击靶面的换热表现起到削弱作用；相较于三排泄流孔的布置形式,双排泄流孔对靶面换热水平影响更小；相比于泄流孔与冲击孔在流向位置错列排布,二者位置保持一致时,泄流孔的抽吸作用对换热效果削弱最为严重。

Facing the increasing cooling requirements caused by the continuously rising inlet temperature of turbines, this paper proposes a return-flow impingement cooling structure to suppress the negative impact of crossflow accumulation on jet cooling at the leading edge of turbine blades. Through the utilization of CFD numerical calculations, a comparative analysis is conducted on the numerical results of various layouts of bleed holes to explore the effects of the suction action of bleed holes on the flow and heat transfer characteristics of the cooling structure. The research findings indicate that the introduction of bleed holes reconstructs the impinging jet flow field, effectively restraining the development of wall jets and reducing the heat transfer performance on the impingement target surface. Compared to the layout with three rows of bleed holes, the layout with two rows of bleed holes has a smaller influence on the heat transfer level on the target surface. Additionally, when the bleed holes and impingement holes are aligned in the same position rather than staggered in the streamwise direction, the suction effect of the bleed holes exhibits the most pronounced weakening effect on the heat transfer performance.

国家资助博士后研究人员计划（GZC20233441）