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

发布时间：2018-01-26 10:13

本文关键词： 给水泵汽轮机阀门蒸汽流场计算流体力学　出处：《动力工程学报》2016年02期 　论文类型：期刊论文

【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.
[Abstract]:In view of the three-dimensional steam flow of a turbine governing valve set with a nozzle regulating feedwater pump under rated working conditions, the numerical simulation analysis was carried out by using the computational fluid dynamics method. In order to obtain the effect of upstream and downstream structure of valve groups on the steady steam flow field in valve group pipeline, the shear stress transport model (SST) is used to close the governing equations of turbulence model. The multi-reference coordinate system method is used to calculate the three-dimensional steam flow field in the moving vane passage area of the regulating stage, and the pressure loss level in each valve passage is analyzed emphatically. Flow distribution and flow characteristics of superheated steam in regulating valve system, and multi-valve chamber. The complex three-dimensional flow characteristics of the downstream diffuser lines and bends at the outlet of the valve are analyzed. The results show that the flow rate of the valve is mainly determined by the number of nozzles downstream of the valve. The distance from the system inlet of the control valve has a great influence on the flow capacity of the regulating valve.
【作者单位】：上海交通大学燃气轮机研究院;上海交通大学机械与动力工程学院叶轮机械研究所;上海汽轮机有限公司;
【分类号】：TK263
【正文快照】： 3.上海汽轮机有限公司,上海200240)给水泵汽轮机是电站热力循环系统的主要部件之一,相对于电动泵而言,可以提高总体热力循环的效率.因锅炉给水的要求,给水泵常常需要调整工作点,给水泵汽轮机常常处于变工况运行状态,采用喷嘴调节可以得到较高的变工况效率.在给水泵汽轮机中,用

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