汽轮机末级动叶片断裂级性能数值研究  

Numerical study for the performance of steam turbine stages after the final stage blades fractured

作　　者：介红恩[1] 谢蓉[1] 黄钟岳[1] 

机构地区：[1]大连理工大学动力工程系,辽宁大连116023

出　　处：《燃气轮机技术》2006年第4期51-54,共4页Gas Turbine Technology

摘　　要：针对某电厂汽轮机末级叶片断裂后修整再用这一实际情况,应用FINE/Turbo软件模拟断裂前后的流场,讨论、分析末级叶片断裂后对汽轮机末级及其它各级性能的影响,得出如下结论:汽轮机效率降低、汽耗增加。各级后压力升高,汽轮机轴向推力、扭矩降低;各级压力参数相对于未断裂时有所降低,特别是次末级出口压力参数降低最多;叶片断裂处速度分布不均匀、变化较剧烈,在叶顶处形成了较大的回流区,流动损失加大。For the fact that one electric power station scalped and reused the broken final stage blades of steam turbine,with HNE/Turbo perform the computation about every stage flow,discuss and analyze the influence on final stage and other stage of turbine after fracture,come into the conclusion as follows： the efficicncy decreases, consumption of steam increases, the pressure after the stages increases,axlal thrust and torque decrease ;compared with the unfractured condition, to some extent the pressure parameters of all stages decrease,in particular the outlet pressure parameter for penultinmte stage reduces most;at the point of the blade frscturafion the velocity is maldistribution and changes bitterly,form bigget spiral circumfluence area at the shroud, and the flow loss increases.

关 键 词：汽轮机 末级动叶片 叶片断裂 流场模拟 

分 类 号：TK268.3[动力工程及工程热物理—动力机械及工程]