导叶端隙密封结构对可调涡轮性能的影响

Effect of end-clearance sealed structure of guide vane on variable nozzle turbine performance

基于传统可调涡轮导叶,设计了一种带有端隙密封结构的喷嘴环导叶(end-clearance sealed guide vane, ESGV)。在导叶不同开度下,对ESGV可调涡轮进行数值模拟,分析了ESGV对可调涡轮性能的影响,结果表明:ESGV可以有效的抑制导叶端隙泄漏流,能够明显改善喷嘴环和转子通道的流动状态,进而提高涡轮效率。对ESGV可调涡轮和原始涡轮进行涡轮特性试验,结果显示:两型涡轮流量特性大致相同时,在导叶中开度下,ESGV涡轮效率较原始涡轮提高了5%,验证了ESGV方案的有效性。

Based on the traditional variable nozzle turbine guide vane,an end-clearance sealed guide vane(ESGV)was designed.The effect of ESGV on the performance of the turbine was analyzed by numerical simulation under different guide openings.The results showed that ESGV can effectively suppress the end-wall clearance leakage flow of the guide vane and improve the flow state of nozzle ring and rotor channel,and then enhance the turbine efficiency.Finally,the turbine performance tests of the ESGV turbine and the prototype turbine were carried out.The results showed that,when the flow characteristic curves of the two turbines were roughly the same,the efficiency of the ESGV turbine was 5% higher than that of the prototype turbine at the medium opening.