流体诱发传热管振动的流场特性分析

Flow Characteristic Analysis of Flow Induced Heat Exchanger Tube Vibration

基于双向流-固耦合方法，建立横向流体作用下传热管流致振动计算的三维仿真模型；基于该模型，研究传热管流致振动时的流场特性。结果表明，当折减速度Ur〈2时，升力系数随坼的增加而增加，阻力系数随坼的增加先减小再增大；当2〈Uf〈9时，发生了升力方向的锁定，阻力先于升力达到峰值；当U≥9时，升力趋于零；弹性管的阻力是静止管的2～2．5倍，升力约是静止管的6倍；振动使得管表面压力分布和尾涡结构发生了变化，弹性管后的旋涡横向间距较静止单管明显增大，仅出现2s模式的尾涡模态。

A three-dimensional numerical model for heat transfer tube vibration induced by cross flow is proposed with two ways coupled approach. The characteristics of flow field are investigated based on the numerical model. The results show that, when U≤2, lift force coefficient increases as U, increases, while drag force coefficient decreases first and then increases. When 2〈Ur〈9, the Locked In phenomenon occurs and drag force reaches the peak value prior to that of lift force. As U≥9, lift force is tending to zero. The drag force of flexible tube is about 2-2.5 times of that of the fixed tube, and the lift force is 6 times. Vibration makes the pressure distribution and wake vortex mode change. The transverse space between vortexes is amplified obviously compared to the case of fixed tube. There is only 2S mode existing in the present study.