【摘要】 燃气轮机二次空气系统的冷却气体通过轮缘密封阻止主流燃气入侵,同时冷却气体通过轮缘密封射流进入主流流道并与主流掺混。轮缘密封射流与主流相互作用对透平级的气动性能和传热冷却特性具有重要影响。本文综述了考虑轮缘密封射流作用下透平级气动性能的实验和数值研究进展,阐明了轮缘密封射流改变端区二次流涡系结构的作用机制;介绍了轮缘密封射流对叶栅端区传热冷却性能影响的研究现状;给出了轮缘密封结构设计对提高透平级气热性能的研究成果;简要回顾了高负荷透平叶栅非轴对称端壁设计理论和进展,重点讨论了轮缘密封射流对非轴对称端壁透平级气热性能的影响特性。论文总结了考虑轮缘密封射流与主流相互作用的透平级气热性能研究结论,展望了轮缘密封射流作用下透平级气热性能需要深化的重点研究方向。更多还原

【Abstract】 The coolant flow from secondary air system of gas turbines can prevent mainstream ingestion. At the same time,the rim seal purge flow can ingress into the main annulus flowpath and mix with mainstream. The interaction between the rim seal purge flow and mainstream significantly impacts on the aerothermal performance of turbine stage. Experimental measurements and numerical simulations on the aerodynamic performance of turbine stage with emphasis of rim seal purge flow effects are reviewed. The variation of the secondary flow structure of blade endwall due to the rim seal purge flow is illustrated. The status of the heat transfer and cooling effectiveness of blade endwall considering the rim seal purge flow effects is introduced. The research achievement of rim seal structure design for improving the aerothermal performance of turbine stage is presented. The design principle and research status of the nonaxisymmetric end wall of high loaded turbine blade is briefly reviewed. The effect of rim seal purge flow on the aerothermal performance of non-axisymmetric endwall of turbine stage is discussed. The aerothermal performance of turbine stage considering the interaction between the rim seal purge flow and mainstream is concluded. The important research topics of the aerothermal performance of turbine stage with consideration of rim seal purge flow effects are addressed.更多还原