摘要
离心泵是核能系统中的重要部件,其内部流动直接影响设备安全运行。本文在综合运用粒子图像测速(PIV)技术和激光诱导荧光(LIF)技术的基础上,对离心泵内部的复杂流动过程开展了连续可视化的实验研究,获得了离心泵内流场的分布特征,分析了其内部流动机理及变化规律。结果表明,连续PIV测量技术能够以高质量时空分辨率识别流场内的涡旋结构;在回流、二次流以及叶轮-蜗壳间动静干涉等效应下,涡旋结构会经历形成、迁移、扩散、衰减、破碎、消失等演变过程;由于多种作用机制耦合,叶轮-蜗壳干涉区、隔舌附近以及叶轮后缘等区域的流场结构复杂,会随机形成不稳定涡旋结构,易导致离心泵内部压力脉动。
Centrifugal pump is the important component in nuclear energy systems,and the internal flow has a direct impact on its safe operation.On the basis of the comprehensive application of Particle Image Velocimetry(PIV)technology and Laser Induced Fluorescence(LIF)technology,the continuous visualization experimental research on complex internal flow process of centrifugal pump are conducted in this paper.The distribution characteristics of the flow field are obtained.The mechanism and variation law of internal flow are analyzed.The results show that continuous PIV measurement technology can identify the vortex structure in the flow field with high-quality spatiotemporal resolution.Under the effects of reflux,secondary flow,and dynamic static interaction between impeller and vortex shell,the vortex structure undergoes evolution process including formation,migration,diffusion,attenuation,fragmentation,and disappearance.Due to the coupling of multiple mechanisms,the flow field structures in the regions near the rotor-stator interaction zone,the cut-water,and the trailing edge of the impeller are complex,which can randomly form unstable vortex structures and easily lead to pressure pulsation inside the centrifugal pump.
作者
范永建
黄云龙
王拓
张晋雷
谭思超
Fan Yongjian;Huang Yunlong;Wang Tuo;Zhang Jinlei;Tan Sichao(Dongfang Boiler Group Co.,Ltd.,Dongfang Electric corporation,Zigong 643001,China;AECC Hunan Aviation Powerplant Research Institute,Hunan 410315,China;Heilongjiang Provincial Key Laboratory of Nuclear Power System&Equipment,Harbin Engineering University,Harbin 150001,China)
出处
《核安全》
2024年第4期77-84,共8页
Nuclear Safety
关键词
离心泵
可视化
涡旋结构
流场
压力脉动
centrifugal pump
visualization
vortex structure
flow field
pressure pulsation
作者简介
范永建(1981-),男,现主要从事核能设备研发和技术服务工作。
