叶尖凹槽对某燃气涡轮叶尖间隙流动影响的研究

Investigation of Squealertip on Tip Leakage Flow in Turbines

采用数值模拟的方法研究了叶尖凹槽对某燃气涡轮性能及流场的影响,并对其作用机理进行了分析。结果表明:叶尖凹槽对涡轮性能的影响较小,可减小叶尖泄漏流流量并提高涡轮效率。相对平顶叶片,凹槽叶片涡轮效率最大可提高0.06%。在5%～30%叶尖凹槽高度范围内,凹槽高度越大,叶尖泄漏涡强度越小,涡轮效率提升越大;在60%～90%叶尖凹槽长度范围内,叶尖凹槽长度越长,叶尖泄漏涡强度先减小后增大,效率提升幅度也是先增大后减小。

A numerical investigation of the impact of squealertip on blade tip leakage flow is studied in this paper, including both the flow physics and performance. The results show that, tip leakage flow is reduced and turbine performance is improved, but not obvious. Compared with that of flat tip blade,as a result turbine efficiency increases by 0.06%. In the range of 5%~30% of blade height, larger the squealer tip heightresults in smaller the tip leakage vortex strength, and hencehigher turbine efficiency.In the range of 60%~90% of blade chord, the tip leakage vortex first decreases and then increases with increase ofsquealer tip length, and accordingly the turbine efficiencyfirst decreases and then increases.