影响管阵流体弹性不稳定性因素的研究

Study on Several Factors to Influence Fluidelastic Instability of Tube Arrays

研究了管阵中管数,纵向流的作用以及U形管等对管阵流体弹性不稳定性的影响。介绍了用求解模态展开后的振动方程计算管阵的临界流速的方法。给出了简化处理耦合问题的单一振型法和频率截断法。并推导出考虑非均勻流、纵向流存在和U形管的基本方程。

Several factors (number of tubes, axial flow and U-tubes)to influence fluidelastic instability of tube arrays are studied in this paper. The modal analysis method is used to calculate vibration equations to attain critical velocities of tube arrays. The single mode method or frequency truncation method is used to solve coupled problems.