螺旋管式换热器的流致振动研究

流体诱发振动广泛存在于管壳式换热设备中，而螺旋管式换热器由于体积小、换热效率高，近年来大量应用于各类工业换热设备。本文针对单根螺旋管进行流致振动分析，分别利用一维热工水力程序RELAP5、CFD软件FLUENT和有限元软件ANSYS计算螺旋管一、二次侧流体密度分布，一次侧流体的速度场和螺旋管模态振型，并在0、1、2、4、和8支承数下计算单根螺旋管的流弹失稳比和湍流抖振均方根位移比。计算结果表明，当螺旋管采用4个对称支承进行固定时可满足ASME流弹失稳和TEMA湍流抖振的设计标准。

Flow Induced Vibration Research of Helical Tube Heat Exchanger

Flow induced vibration (FIV) widely exists in shell-and-tube heat exchangers, and the helical tube heat exchangers are applied in various industrial heat exchangers recently due to their compactness in volume and high efficiency in heat transfer. In this paper, FIV analysis was carried out for a single helical tube. The fluid density distribution of primary and secondary sides, the fluid velocity field of primary side, and the corresponding mode shape and natural frequency were calculated by RELAP5 program, CFD analysis code FLUENT and finite volume analysis code ANSYS, respectively. The fluid-elastic instability ratio and RMS ratio of turbulent buffeting were calculated under support numbers of 0, 1, 2, 4 and 8. The results show that the four symmetry supports design can meet the requirement of ASME and TEMA code in avoiding fluid-elastic instability and turbulent buffeting.