混流式核主泵压力脉动特性预测与分析  

Prediction and Analysis of Pressure Pulsation Inside a Mixed-flow Diffuser Reactor Coolant Pump

作　　者：赖喜德 叶道星 陈小明 衡亚光 LAI Xide;YE daoxing;CHEN Xiaoming;HENG Yaguang(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)

机构地区：[1]西华大学能源与动力工程学院,四川成都610039 [2]流体及动力机械教育部重点实验室,四川成都610039

出　　处：《西华大学学报（自然科学版）》2020年第5期74-83,共10页Journal of Xihua University:Natural Science Edition

基　　金：四川省科技计划资助项目(2020ZHCG0018,2019YJ0451,2017JY0047);2020年四川省工业发展资金项目。

摘　　要：由于结构和运行工况的原因,混流式核主泵流道中的压力脉动比普通混流泵更为复杂,掌握其流道中的压力脉动特性及在不同运行工况的特征对于满足设计的高可靠性和保证运行的安全性都很有必要。为寻找引起压力脉动的主要因素和探讨运行工况对压力脉动特性的影响,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,对5个典型工况下叶轮和空间导叶流道中不同部位的压力脉动时域与频域特性进行深入分析。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,压力脉动主频为叶频,其幅值取决于运行工况的流量,在设计工况运行其压力脉动的幅值最低;对于采用球形压水室的流道,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;随着运行流量的减少,因球形压水室的几何形状影响会产生涡流和回流,导致叶轮内的中高频脉动幅值增大,若流量过小,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流量工况的压力脉动影响很小,但对小流量工况下的压力脉动影响较大,而且导致频率特性更为复杂。The pressure pulsation inside reactor coolant pump(RCP)is much more complex than that inside a general mixed-fow pump due to its structure and actual operating conditions.It is necessary to understand the pressure pulsation behavior and figure out its characteristics at different operating conditions in order to meet the requirements of high reliability and safety in both design and operation phases.To seek the relationship between the pressure pulsation characteristics and operating conditions,pressure pulsation behavior inside the impeller and guide vanes was carefully investigated by using 3D transient flow simulations of the completed pump at 5 operating conditions,and the time-domain and frequency-domain characteristics of pressure pulsation at different locations inside the RCP were analyzed.It has been shown that the dominant frequency of pressure pulsation is mainly governed by the blade-passing frequency(BPF)due to rotor-stator interaction(RSI)between the impeller blades and guide vanes at all operating conditions,and the amplitude of pressure pulsation mainly depends on the operating discharges and reaches the smallest level in the design operating condition.For an RCP with spherical casing,the amplitude of pressure pulsations inside the impeller increases from inlet to outlet,which reaches the maximum value between the impeller and guide vanes,and then decreases from inlet to outlet of guide vanes.The behavior of pressure pulsations at the inlet of the impeller in circumferential direction is not the same and the pulsations are more intensive on the suction side than that of a blade at different operating conditions.But it is almost the same at the outlet of the impeller as the interaction between the impeller and guide vanes.Due to geometric features of the spherical casing,the vortex flow inside the spherical casing leads to the highly irregular and unsteady pressure pulsations inside flow channel of the impeller and diffusers under smaller discharge operating conditions,and the amplitude of pressure

关 键 词：核主泵 压力脉动 球形压水室 导叶式混流泵 变流量工况 

分 类 号：TH313[机械工程—机械制造及自动化]