类球形压水室的混流式核主泵压力脉动特性  

Pressure Pulsation Behavior of a Reactor Coolant Pump with Mixed-flow Diffuser and Spherical Casing

作　　者：赖喜德 叶道星[2] 陈小明[1] 廖奇 LAI Xide;YE Daoxing;CHEN Xiaoming;LIAO Qi(School of Energy and Power Engineering,Xihua University,Chengdu 610039,China;Key Laboratory of Fluid and Power Machinery,Ministry of Education,Xihua University,Chengdu 610039,China;FRAMATOME DONGFANG Reactor Coolant Pump Co.,Ltd.,Deyang 618000,Sichuan Province,China)

机构地区：[1]西华大学能源与动力工程学院,成都610039 [2]西华大学流体及动力机械教育部重点实验室,成都610039 [3]东方法马通核泵有限责任公司,四川德阳618000

出　　处：《动力工程学报》2020年第2期169-176,共8页Journal of Chinese Society of Power Engineering

基　　金：四川省科技计划资助项目(2017JY0047)。

摘　　要：在对带球形压水室的核主泵进行全流道三维非定常流场数值模拟的基础上,通过对5个典型工况下其主要过流部件中的压力脉动时域与频域特性进行深入分析,寻找引起压力脉动的因素和探讨运行工况对压力脉动特性的影响。结果表明:叶轮与空间导叶的动静干涉是引起压力脉动的主要因素,叶轮、空间导叶和球形压水室的几何参数决定其压力脉动的主要特征;压力脉动主频为叶频,其幅值取决于运行的体积流量,设计工况下的幅值最低;压力脉动幅值沿叶轮进口向出口逐步增大并在叶轮出口达到最大值,然后沿空间导叶的进口向出口逐步减小;在小体积流量工况时,流道中的不稳定流动会产生更为复杂的压力脉动;在同一圆周上,叶轮进口区域的压力脉动特性并不一致,叶片背面脉动幅值大于叶片正面,而在不同工况下叶轮出口区域叶片正、背面的压力脉动特性差别不大;随着运行体积流量的减小,因球形压水室中产生的涡流和回流影响,叶轮内的中高频脉动幅值增大,若运行体积流量过小,整个流道中的脉动幅值都将明显加大;球形压水室对设计工况及大体积流量工况的压力脉动影响很小,但对小体积流量工况下的脉动影响较大,使得脉动的频率特性更为复杂。To find the factors influencing the pressure pulsation behavior of a reactor coolant pump(RCP)with spherical casing,and to seek the relationship between the pressure pulsation and operating conditions,the time-domain and frequency-domain characteristics of pressure pulsation were carefully analyzed at different locations in the RCP under 5 typical operating conditions,based on 3D numerical simulation on unsteady flow through the full passage of the RCP.Results show that the pressure pulsation is mainly caused by the rotor-stator interaction(RSI)between the impeller and guide vane,and the main features of pressure pulsation depend on the geometrical parameters of the impeller,guide vane and spherical casing.The primary frequency of pressure pulsation is that of the impeller,and its maximum amplitude mainly depends on the operating flow,which reaches the minimum in the design operating condition.The amplitude of pressure pulsation in the impeller increases from the inlet to the outlet,which reaches the maximum at the impeller outlet,and then decreases from the inlet to the outlet of guide vanes.The unsteady flow in flow passage would cause highly irregular pressure pulsation under small discharge conditions.The pressure pulsation differs in the same circumference near impeller inlet,which is more intensive on the suction side than the pressure side of a blade,but is almost the same at impeller outlet under different operating conditions.The amplitude of pressure pulsation increases in the medium and high frequency area with the rise of operating discharges,due to the vortex and backflow formed in the spherical casing,which would increase distinctly when the RCP is operating at extreme small discharges.The spherical casing does have influence on the pressure pulsation in the impeller and guide vane,and the effect is stronger under smaller discharge conditions,but weaker under design and larger discharge conditions.

关 键 词：混流式核主泵 压力脉动 叶轮 球形压水室 变流量工况 

分 类 号：TH313[机械工程—机械制造及自动化]