小流量工况下汽轮机末级的脱流特性研究  

Study on Flow Separation Characteristics of the Last Stage in Steam Turbine Under Small Flow Rate Conditions

作　　者：赵金峰[1] 冯忠宝 曹丽华[2] 司和勇 姚莹莹[1] ZHAO Jin-feng;FENG Zhong-bao;CAO Li-hua;SI He-yong;YAO Ying-ying(Jilin Province Electric Power Research Institute Company Limited,Changchun 130021,China;School of Energy and Power Engineering,Northeast Electric Power University,Jilin 132012,China)

机构地区：[1]吉林省电力科学研究院有限公司,长春130021 [2]东北电力大学能源与动力工程学院,吉林132012

出　　处：《汽轮机技术》2019年第3期192-194,共3页Turbine Technology

基　　金：国家电网公司科技项目资助(JLDKYGSWWFW201805021)

摘　　要：利用CFX软件对小流量下汽轮机低压缸末级叶片的脱流特性进行研究。结果表明:在额定背压、G1/G0=0.3工况下,动静叶间隙开始形成脱流涡。随着流量的减小,脱流涡沿叶高向叶根方向发展。当G1/G0=0.08时,脱流涡几乎占据整个叶高,涡核由72.7%相对叶高迁移到49.1%,严重恶化末级流场,威胁叶片安全。The flow separation characteristics of the last stage at the low pressure cylinder in steam turbine under small flow rate conditions were studied by CFX. The results show that the flow separation vortices begin to form between rotor and stator under the condition of rated back pressure and G1/G0= 0.3 . The flow separation vortices spread toward to the blade root with the flow rate decreasing. When G1/G0 = 0.08 , the flow separation vortices occupies almost the whole blade height. The vortices cores migrated from 72.7% of relative blade height to 49.1%, which seriously deteriorated the flow field of the last stage and threatened the safety of the blade.

关 键 词：汽轮机 末级叶片 小流量工况 脱流涡 

分 类 号：TK264[动力工程及工程热物理—动力机械及工程]