上下游结构对喷嘴调节给水泵汽轮机调节阀组流动特性的影响  

Influence of Upstream/Downstream Structures on Aerodynamics of Control Valve System in Feed-water Pump Steam Turbine

作　　者：王鹏[1,2] 何劲[3] 刘应征[1,2] 

机构地区：[1]上海交通大学燃气轮机研究院,上海200240 [2]上海交通大学机械与动力工程学院,叶轮机械研究所,上海200240 [3]上海汽轮机有限公司,上海200240

出　　处：《动力工程学报》2016年第2期107-112,150,共7页Journal of Chinese Society of Power Engineering

摘　　要：针对某喷嘴调节给水泵汽轮机调节阀组在额定工况时的三维蒸汽流动,采用计算流体力学方法对其进行数值模拟分析,以获取各调节阀均全开时阀组上下游结构对阀组管道内部稳态蒸汽流场的影响.计算中采用剪切应力输运模型(SST)来封闭湍流模型控制方程组,并采用多重参考坐标系法(MRF)计算获取调节级内动叶排通道区域的三维蒸汽流场.重点分析了各阀门通道内的压力损失水平、流量分配情况和过热蒸汽在调节阀组系统中的流动特性,以及多阀腔室、阀门出口下游扩压管路和弯管等部件内部的复杂三维流动特征.结果表明:调节阀流量主要由阀门下游喷嘴数量决定;调节阀距离阀组系统进口的距离对调节阀通流能力具有较大影响.The three-dimensional steam flow in control valve system of a nozzle-governing feed-water pump steam turbine was extensively modeled at the rated condition by using computational fluid dynamics （CFD）, so as to study the influence of upstream/downstream structures on internal steam flow field in the piping of control valve system when all the valves are open. In simulation, the shear stress transport （SST） model was used to solve the closure problem of classic governing equations, while the multiple reference frame （MRF） method was used to simulate the flow field around the rotor in the governing state, with focus on the pressure loss and flow distribution in different valve passages, and on the flow character- istics of superheated steam in the control valve system; meanwhile, an analysis was conducted to the complicated three-dimensional steam flow patterns in following components, such as in the multi-valve chamber, the diffuser downstream the valve exit and in the tube bends, etc. Results show that the flow capacity of control valve is mainly determined by the quantity of downstream nozzles, which is greatly influenced by the distance from the control valve to the inlet of the valve system.

关 键 词：给水泵汽轮机 阀门 蒸汽流场 计算流体力学 

分 类 号：TK261[动力工程及工程热物理—动力机械及工程]