3种附属管排布方式对主管路水动力特性的影响

【目的】研究均匀流多管束干涉流动下圆柱受迫振动的水动力特性。【方法】基于SSTκ-ω模型,在亚临界雷诺数下(Re=1×10⁵)对多管束共振强迫的涡激振动问题进行二维数值模拟,比较与分析三种典型附属管排布方式对主管路流体动力学特征的影响。【结果与结论】采用模型3下的附属管排布方式可在较大范围的振幅比下(A_y/D=0.1~0.8)有效改善主管路水动力特性:1)有效降低主管路上平均升力系数的幅值;2)抑制在单管路系统中出现的脉动升力系数突变衰减。同时,由于多管束对流动产生干涉效应,主管路上表现的尾迹涡度随着振动幅度的增大而呈现出不同的模式。此外,功率谱密度分析发现,多管束系统相较于单圆柱系统,在频率比为1时,模型2与模型3的共振“锁定”状态得到改善。

Influence of Three Arrangement Modes of Auxiliary Pipes on Hydrodynamic Characteristics of Main Line

【Objective】The study is to investigate the hydrodynamic characteristics of cylinder subjected to forced vibration under the interference flow of multiple bundles with uniform flow.【Method】Based on SSTκ-ωmodel,under subcritical Reynolds number(Re=1×10⁵),a two-dimensional numerical simulation of the vortex-induced vibration problem of multi-tube bundle resonance was carried out,and the influence of three typical auxiliary tube arrangement methods on the hydrodynamic characteristics of the main pipeline were compared【Result and Conclusion】The arrangement of auxiliary pipes under Model 3 can effectively improve the hydrodynamic characteristics of the main line at a wide range of amplitude ratios(A_y/D=0.1-0.8):1)Effectively reduce the average lift coefficient of the main line;2)Suppress the sudden attenuation of the pulsating lift coefficient in the single-piping system.Meanwhile,due to the interference effect of the multi-tube bundle on the flow,the wake vorticity of the main pipe shows different patterns with the increase of vibration amplitude.In addition,Power Spectral Density analysis shows that the resonance“lock-in”state of Model 2 and Model 3 of the multi-bundle system is improved when the frequency ratio is 1,compared with the single-cylinder system.