汽封管路数值模拟计算及改进研究  

Numerical simulation and improvement analysis of steam seal line

作　　者：吴宏霞 刘庆龙[2] 顾磊 WU Hong-xia;LIU Qing-long;GU Lei(Hangzhou Xiaoshan Technician College,Hangzhou 311201,China;Hangzhou Chinen Steam Turbine Power Co.,Ltd.,Hangzhou 310018,China)

机构地区：[1]杭州萧山技师学院,浙江杭州311201 [2]杭州中能汽轮动力有限公司,浙江杭州310018

出　　处：《机电工程》2018年第7期703-707,共5页Journal of Mechanical & Electrical Engineering

基　　金：国家自然科学基金资助项目(61205121)

摘　　要：针对汽封的密封性问题,对汽封管道抽吸压力传播对汽封漏气量的影响、复杂通流结构对传递到汽封侧抽吸压力及汽封漏气量的影响、汽封流量理论计算与CFX模拟计算结果之间存在的误差等方面进行了研究。对汽封进行了三维实体建模及数值模拟,对汽封管道性能参数计算结果、汽封管道截面压力分布情况和截面速度分布情况进行了分析,提出了一种在现场改造中简单有效而又经济的改进型汽封管路结构。研究结果表明:通过加粗中间段平衡管道,该改进型结构可有效减少汽封管道压损,增大过渡段压力,减少高压段漏气,提升汽封效果,提高汽轮机运行效率和可靠性。Aiming at the problem of steam sealing property,the suction pressure propagation of steam seal line＇s effect on steam seal leakage,the complex flow path structure＇s effect on the suction pressure delivered to steam seal side and on steam seal leakage,the difference between theoretical calculation and CFX simulation results of steam seal flow and so on were studied. Three dimensional solid modeling and numerical simulation of steam seal were done,the performance parameter calculation results of steam seal line,the cross section pressure distribution and the cross section velocity distribution of steam seal line were analyzed,and an improved structure of steam seal line was proposed,which is a simple,effective and economic structure used in site reconstruction. The results indicate that by the augmentation of middle segment balance pipe diameter,the improved structure can effectively decrease the pressure loss of steam seal line,increase the pressure of transition segment,decrease the leakage of high pressure segment,increase the effect of steam seal,increase the operation efficiency and reliability of steam turbine.

关 键 词：汽轮机 汽封效果 汽封管路 CFX模拟 

分 类 号：TH122[机械工程—机械设计及理论] TK263.2[动力工程及工程热物理—动力机械及工程]