基于全三维动网格技术的变长径比间隙环流的研究  

Research on Annular Gap Flow with Varying Aspect Ratio based on Three-dimensional Dynamic Mesh

作　　者：黄松[1] 尹俊连[1] 宋煜[1] 王德忠[1] HUANG Song;YIN Junlian;SONG Yu;WANG Dezhong(Shanghai Jiao Tong University,Shanghai 200000,China)

机构地区：[1]上海交通大学,上海200000

出　　处：《大电机技术》2022年第3期55-63,共9页Large Electric Machine and Hydraulic Turbine

摘　　要：屏蔽电动机核主泵(简称屏蔽电机主泵)是第三代核电站压水堆核电站一回路的核心设备。屏蔽电机主泵由泵和屏蔽电机两个部分组成,屏蔽电机的转子完全被冷却剂浸没,形成了典型的间隙环流。相关研究表明,大长径比下间隙环流会给转子系统带来显著的负刚度效应,从而影响转子系统的稳定。本文以密封间隙为研究对象,利用全三维动网格技术,研究了长径比连续变化下的间隙环流流场,对大长径比下转子产生负刚度效应的原因进行了深入分析。研究表明,全三维动网格技术计算出的动特性系数与试验结果吻合度较高,负刚度效应是进口端流场的正向支撑作用与出口端流场反向支撑作用共同决定的结果。The reactor coolant pump(RCP) is one of the key equipment in reactor coolant system. reactor coolant pump is composed of the pump and the canned motor. The rotor of the canned motor is completely immersed by the coolant, forming a typical gap circulation. Relevant studies have shown that the principal stiffness of the annular gap flow can turn into negative from positive as the length of the gap increases, thereby affecting the stability of the rotor system. In this paper, the sealing gap is taken as the research object. The three-dimensional dynamic mesh is used to study the flow field with the lengthening of the gap, and the reasons for the negative principal stiffness of the rotor are analyzed in depth. The research shows that the dynamic characteristic coefficient calculated by the three-dimensional dynamic mesh is in good agreement with the experiment results. The negative principal stiffness is determined by the positive support effect of the flow field at the inlet and the reverse support effect of the flow field at the outlet.

关 键 词：屏蔽电动机核主泵 间隙环流 转子动力学 负刚度 

分 类 号：TM301.42[电气工程—电机]