基于增材制造的“猫耳形”气膜孔冷却性能研究

Study on Cooling Performance of“Cat Ear”Air Film Hole Based on Additive Manufacturing

针对目前气膜冷却存在的冷却效果不理想,冷却效率较低等问题,提出基于双曲线的“猫耳形”气膜孔,对“猫耳形”气膜孔的结构参数及平板模型分布参数进行优化,并通过金属增材制造技术打印气膜孔样品进行实验。通过实验分析得到了气膜孔优化后的最佳结构参数和平板模型的最佳分布参数,并对冷却气流的射出速度进行了合理优化,单个气膜孔的最优冷却效率为55.56%,多列气膜孔的最高冷却效率达到73.10%,较相关文献中气膜孔平均冷却效率提升了6.10%,最优列间距R为15 mm。实验研究为涡轮叶片气膜孔的设计优化及气膜孔在涡轮叶片上的分布参数提供了重要的参考价值和设计经验。

Aiming at the problems of unsatisfactory cooling effect and low cooling efficiency of air film cooling,the"cat ear"air film hole based on hyperbolic curve is proposed,the structural parameters of the"cat ear"air film hole and the distribution parameters of the plate model are optimized.And the air film hole sample is prepared by metal additive manufacturing technology for experiments.The optimal structural parameters are obtained after the optimization of the air film hole parameters and the optimal distribution parameters of the plate model by experimental analysis.The injection speed of the cooling air flow is reasonably optimized and the optimal cooling efficiency of the single air film hole is 55.56%and the maximum cooling efficiency of the multi-column air film holes is 73.10%,which is 6.10%higher than the average cooling efficiency of the pores in the relevant literature.The optimal column spacing R is 15 mm.The experimental study provides important reference value and design experience for the design optimization of the air film hole of the turbine blade and the distribution parameters of the air film hole on the turbine blade.