空气冷却器脉动流诱导管束振动的研究

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英文篇名：Study on Tube Bundles Vibration Induced by Pulsating Flow in Air Cooler 作者：徐威 ; 李来强 ; 徐波 英文作者：XU Wei;LI Laiqiang;XU Bo;School of Energy and Power Engineering,University of Shanghai for Science and Technology;School of Materials Science and Engineering,University of Shanghai for Science and Technology; 关键词：空气冷却器 ; 脉动流 ; 管束振动 ; 激励频率 ; 幅值 ; FLUENT软件 英文关键词：air cooler;;pulsating flow;;vibration of tube bundles;;excitation frequency;;amplitude;;FLUENT 中文刊名：QGJX 英文刊名：Light Industry Machinery 机构：上海理工大学能源与动力工程学院;上海理工大学材料科学与工程学院; 出版日期：2019-01-24 出版单位：轻工机械 年：2019 期：v.37;No.157 语种：中文; 页：QGJX201901007 页数：7 CN：01 ISSN：33-1180/TH 分类号：42-48

摘要

为探究脉动流对空气冷却器内部管束振动的影响,以空冷器轴侧截面为研究对象,建立二维流场数学模型,借助FLUENT软件模拟流场在一个周期内速度和压力的变化趋势,通过用户自定义函数(UDF)改变入口速度方程中激励频率的大小,分析其对管束升、阻力系数的影响,进一步探究管束沿X和Y方向的幅值变化及其运动轨迹。结果表明:不同激励频率下脉动流对换热管升力、阻力系数的频率及幅值均有一定影响;激励频率为80 Hz时,换热管沿X和Y方向的振幅均明显高于其他激励频率工况。因此,在实际生产中,应避免结构频率与脉动流频率范围相接近。
        In order to explore the influence of pulsating flow on the vibration of tube bundles in air cooler,the axial section of air cooler was taken as the research object,and the mathematical model of two-dimensional flow field was established. The variation trend of velocity and pressure of the flow field in one cycle was simulated by FLUENT software,the magnitude of the excitation frequency in the inlet velocity equation was changed by the user-defined function( UDF),through analyzing its influence on the lift and drag coefficient of the tube bundles,the amplitude variation and the trajectory of the tube bundles along the X and Y directions were further explored. The results show that the pulsating flow under different excitation frequencies have a certain influence both on the frequencies and the amplitudes of the lift and drag coefficient of heat exchange tube. When the excitation frequency is 80 Hz,the amplitudes of the heat exchange tube along the X and Y directions is obviously higher than that of other excitation frequency conditions. Therefore,in actual production,the structure frequency should be avoided to be close to the pulsating flow frequency range.

引文

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