调节级单通道与全周数值方法对比研究  

Comparative Study of Single-channel Model and Complete-cycle Model Numerical Simulation Based on Control Stage

作　　者：白昆仑 平艳 钟主海[1] 范立华 BAI Kunlun;PING Yan;ZHONG Zhuhai;FAN Lihua(Dongfang Turbine Co.,Ltd.,618000,Deyang,Sichuan,China)

机构地区：[1]东方电气集团东方汽轮机有限公司,四川德阳618000

出　　处：《东方电气评论》2023年第1期35-39,47,共6页Dongfang Electric Review

摘　　要：本文以某350MW亚临界机组为研究对象,采用单通道和全周两种数值模拟方法,分析了调节级在VWO、THA和75%THA工况下的性能。结果表明:由于单通道模型未考虑部分进汽、进汽室等影响因素,对调节级内复杂流场的模拟不准确,所得损失明显较低,进而导致效率明显高于全周计算结果。此外,单通道和全周计算得到的调节级动叶域内的损失差异较静叶域内更大,导致单通道计算得到的压力反动度明显低于全周计算结果,以压力反动度为输入参数,计算得到的调节级轴向推力值差异也较大。实际工程中,评估调节级推力时,建议以全周计算得到的压力反动度为输入参数。Based on a 350MW subcritical steam turbine,the performance of control stage at VWO,THA and 75%THA conditions are investigated by using single-channel model and complete-cycle model numerical simulation.The results show that,because the single-channel model similation ignores the influence of partial admission and steam adimssion,it can not simulates the flow distribuiton in control stage accurately,so the loss of control stage calculated is lower than that calculated by using complete-cycle model,which leads higher efficiency.Furthermore,the difference of loss in blade calculated by using single-channel model and complete-cycle model is much higher than that in vane,so the pressure reaction calculated by using single-channel model is lower than that calculated by using complete-cycle model,which affects the calculated values of axial thrust significantly.The pressure reaction calculated by using complete-cycle model is suggested to use in calculating axial thrust of control stage in engineering.

关 键 词：调节级 压力反动度 效率 轴向推力 

分 类 号：TK26[动力工程及工程热物理—动力机械及工程]