滤网对汽轮机高压调节阀气动性能影响的模拟及试验研究  

Numerical and Experimental Study on the Influence of Filter on Aerodynamic Performance of High-pressure Control Valve in Steam Turbine

作　　者：钟主海[1] 孙奇[1] 田朝阳[1] 杨长柱[1] Zhong Zhuhai;Sun Qi;Tian Chaoyang;Yang Changzhu(Dongfang Steam Turbine Co.,Ltd.,Deyang 618000,Sichuan Province,China)

机构地区：[1]东方汽轮机有限公司,四川德阳618000

出　　处：《发电设备》2023年第1期13-17,共5页Power Equipment

摘　　要：亚临界机组汽轮机普遍采用带环形滤网的高压调节阀,其气动性能试验测试与数值模拟研究结果表明:滤网的存在显著提高了阀内流场分布的对称性,减小了阀碟在来流方向与垂直来流两个方向上的受力,削弱了阀座下游偏斜流场的回流强度,阀座出口流场的均匀性也显著提高。滤网不仅对来流具有整流作用,而且有效控制了阀腔内的绕流。合理的滤网尺寸设计对阀门流量系数和总压损失系数的影响很小,并且可显著提高流场的稳定性。通过数值计算结果与试验测试结果的对比,表明采用多孔介质模型进行模拟的精度可满足工程应用要求。For the steam turbine in a subcritical unit, a study was conducted on the experital test and numerical simulation for the aerodynamic performance of the high-pressure control valve with the annular filter. Results show that by adopting the filter, the the symmetry of the flow field distribution in the valve is significantly improved, and the force on the valve disc in the flow direction and the direction perpendicular to the flow is reduced. Which results in the weakened backflow intensity of the oblique flow field in the valve seat downstream and the significant improved uniformity of the outlet flow field of the valve seat. The filter can not only rectify the flow, but also effectively control the flow around the valve chamber. The filter with a reasonable design has little effect on the flow coefficient and the total pressure loss coefficient of the valve, and can significantly improve the stability of the flow field. Through the comparison between numerical calculation results and experimental test results, it is proved that the simulation precision based on the porous media model can satisfy the engineering application requirements.

关 键 词：亚临界机组 汽轮机 调节阀 滤网 整流 控制绕流 

分 类 号：TK264.9[动力工程及工程热物理—动力机械及工程]