U型管阵流体弹性不稳定性分析

Analysis on Elastic Unstability of Fluid in U-Shape Tube Bundle

从U型管振动方程出发,推导出 U 型管阵流体诱发振动方程,给出了管阵出现流体弹性不稳定性临界流速的计算方法及算例。结果表明:管阵的临界流速与其频率取 U 型管阵中各管子一阶频率平均值的直管管阵的流速基本一致。

Based on the vibration equation of an U-shape tube,the flow-induced vibration equation of an U-shape tube bundle is extract-ed.This paper presents the method and an example for calculat-ing flow's critical velocity which should cause elastic unstabiliz-ing of fluid in an U-shape tube bundle.It is shown that thecritical velocity generally agrees with that of a direct tube bundleas the frequence of the direct tube bundle is equal to the averagevalue of one-class frequences of the tubes in the U-shape tubebundle.