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针对简化的叶片尾缘,设计了3种旋流冷却结构,即冷气分别从旋流腔中部射流孔、旋流腔异侧射流孔、旋流腔同侧射流孔进出旋流腔,并与常规凸台扰流柱冷却结构进行了对比数值研究,分析其强化换热机理和效果.结果表明:旋流腔的结构和冷气的进流布置对旋流冷却性能的影响很大,冷气从旋流腔某侧射流孔进出的旋流冷却结构不仅在流向截面产生涡旋,在展向截面也会产生涡旋,从而有效强化对流换热;相比凸台扰流柱冷却结构,旋流冷却结构能够增强换热,平均努塞尔数增大6.8%~22.9%,但流动阻力也随之增加;冷气从旋流腔异侧射流孔进出的冷却结构强化换热能力较高;而冷气从旋流腔同侧射流孔进出的冷却结构流动换热综合系数比凸台扰流柱提高4.2%,综合性能相对较优.
According to the simplified blade trailing edge, three kinds of swirling cooling structures are designed, namely the cold air flows into the swirl chamber from the middle of the middle of the swirl chamber, the other side of the swirl chamber and the same side of the swirl chamber, The results show that the structure of the cyclone chamber and the inflow arrangement of the cold air have a great influence on the performance of the cyclone cooling, and the cold air from the cyclone The swirling cooling structure of the inlet and outlet of one side of the chamber not only produces vortex in the flow section but also vortexes in the span direction so as to effectively enhance the convective heat transfer. Compared with the baffle cooling structure, the swirling cooling structure The average Nusselt number increased by 6.8% -22.9%, but the flow resistance also increased. The cooling capacity of the cooling structure entering and exiting from the jet hole of the vortex chamber was higher, The integral coefficient of flow and heat transfer of the cooling structure entering and exiting the same side of the jet chamber is 4.2% higher than that of the baffle, and the overall performance is relatively good.