汽轮机低压通流区鼓风态流场数值分析  

Numerical Investigation on Windage Flow Field Characteristics in Low Pressure Flow Passage of Turbine

作　　者：宋文希 朱蓬勃[1,2] 高庆 惠涛[3] 余小兵 谷伟伟 张永海 居文平[1,2] SONG Wenxi;ZHU Pengbo;GAO Qing;HUI Tao;YU Xiaobing;GU Weiwei;ZHANG Yonghai;JU Wenping(Xi’an TPRI Energy Conservation Technology Co.,Ltd.,Xi’an 710054,China;Xi’an Thermal Power Research Institute Co.,Ltd.,Xi’an 710054,China;China Northwest Architecture Design and Research Institute Co.,Ltd.,Xi’an 710018,China)

机构地区：[1]西安西热节能技术有限公司,西安710054 [2]西安热工研究院有限公司,西安710054 [3]中国建筑西北设计研究院有限公司,西安710018

出　　处：《热力透平》2019年第1期20-25,共6页Thermal Turbine

基　　金：华能集团总部科技项目(HNKJ17-H13)

摘　　要：为了研究低压缸进汽流量变化对某汽轮机低压通流区域流动鼓风特性的影响,建立了低压末级通流区域全5级流动分析数值计算模型,并应用SST湍流模型对三维RANS方程组进行了求解。数值计算结果表明:当低压缸进汽流量降低至8.9%THA进汽流量时,末级会出现较为明显的鼓风态流动现象。随着流量的减小,鼓风现象愈加明显。鼓风温度最高的区域位于末级静叶与动叶之间。研究成果可为低负荷工况下汽轮机设计及运行提供参考。In order to research the influence of admission flow change on the windage flow field characteristics and aerodynamic performance in low pressure cylinder, a numerical calculation model of all last 5 stages in low pressure cylinder was established, and the three-dimensional Reynolds-Averaged Navier-Stokes (RANS) equation was solved utilizing SST turbulent model. The numerical calculation results showed that when the mass flow admission in low pressure cylinder dropped to 8.9% THA, obvious windage phenomenoen would appear in last stage, and it would be more serious when the mass flow decreased. The highest temperature region of the windage located between last rotation and stationary blades. The research results can provide reference for design and operation of turbine under low load condition.

关 键 词：汽轮机 通流区域 数值计算 鼓风态 

分 类 号：TK262[动力工程及工程热物理—动力机械及工程]