汽轮机低压末级仿生叶型优化及流动特性研究  

Aerodynamic Performance and Biomimetic Optimization of Low-pressure Last Stage Blade of Steam Turbine

作　　者：韩安 姜伟[1] 吴凡[1] 王纯[1] 谢诞梅[1] HAN An;JIANG Wei;WU Fan;WANG Chun;XIE Danmei(Hydraulic Machinery Transients Key Laboratory of Ministry,Wuhan University,Wuhan 430072,China)

机构地区：[1]武汉大学水力机械过渡过程教育部重点实验室,武汉430072

出　　处：《动力工程学报》2021年第10期833-841,共9页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(51776142)。

摘　　要：采用数值模拟方法对某火电机组汽轮机低压末级在小容积流量工况下级内流动分离的发展规律进行了分析,为了提升汽轮机在小容积流量工况下的做功能力,将仿座头鲸头部凸起的结构应用于末级动叶背压面进行型线优化,并基于正交法分析对比了原叶型与不同仿生叶型的末级动叶力矩。结果表明:在小容积流量工况下,仿生凸起结构对改进末级动叶的力矩具有积极作用;正交法分析获得了具有较好性能的优化型线,使进口相对容积流量=0.358 0工况下的末级动叶力矩提高了26.6%。A numerical simulation method was used to analyze the aerodynamic performance of flow separation in the low-pressure last stage blade of the thermal turbine under low volume flow conditions. In order to improve the work capacity of the steam turbine under the condition of low volume flow, the structure of humpback whale head was applied to the back pressure surface of the last stage rotor blade design optimization, and the axial torque of the last stage rotor blade of the original blade and different improved blade types were compared based on orthogonal analysis. Results show that biomimetic structure has a positive effect on the increasement of the axial torque under the condition of small volume flow. Based on orthogonal analysis, the torque of biomimetic blades with tubercles of different parameters are calculated and the optimal structure has been achieved, which can increase the axial torque by 26.6% under relative volume flow=0.358 0.

关 键 词：汽轮机 末级叶片 小容积流量工况 仿生叶型优化 正交法 

分 类 号：TK263.3[动力工程及工程热物理—动力机械及工程]