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基于Lever与Weaver的“流管”模型,本文对换热器管束的流体弹性不稳定性进行了较深入的研究。认为管子作周期性的衰减(或发散)运动。基本方程以复数形式表示,并用复数解法来求解。证明了作用在管上的流体力与管子运动时的位移、速度、加速度密切相关。作出的稳定区图可用来判断管子是否发生流体弹性不稳定现象。将节径比为1.25,1.32与1.41的正方形排列的管束,依次放入风洞中进行试验,取得了令人满意的结果。
Based on the “flow tube” model of Lever and Weaver, the fluid elastic instability of the heat exchanger tube bundle is studied in more depth. The pipe is thought to periodically decay (or diverge) into motion. The basic equations are represented in the plural and solved by the complex solution. It is proved that the fluid force acting on the tube is closely related to the displacement, velocity and acceleration during tube movement. The stability area map can be used to determine whether the tube is fluid-elastic instability. The tube bundles arranged in a square with a section ratio of 1.25, 1.32 and 1.41 were placed in a wind tunnel and tested in turn, and satisfactory results were obtained.