双自由度流致振动恒温圆管热流固耦合特性

Thermal-Fluid-Solid Coupling Characteristics of a Circular Tube in Two Degrees of Freedom Flow-Induced Vibration

针对单根恒温圆管双自由度流致振动-换热耦合特性,分析了结构振动响应以及温度场、平均努塞尔数和最大局部努塞尔数位置的变化规律。结果表明,在雷诺数为100、质量比为1.37和折减速度为5时,圆管振动轨迹为逆时针型式的"8"字形,横流方向振幅远大于顺流方向振幅;旋涡脱落模态为2S,涡脱会引起后驻点附近局部努塞尔数的突增;不同时刻,振动圆管最大局部努塞尔数的位置均不同程度地偏离前驻点;振动圆管的平均努塞尔数明显大于固定圆管,相比固定圆管最大增加5.73%。

This paper studies the fluid-induced vibration-heat transfer coupling characteristics of a single circular tube with constant temperature, and the variation rules of the cylinder vibration response, temperature field, average Nusselt number and maximum local Nusselt number are analyzed. The results show that when Reynolds number Re=100, mass ratio mr=1.37, and reduced velocity Ur=5, the cylinder vibrates in a clockwise "8" shape, and the transverse amplitude is much larger than the downstream amplitude. The vortex shedding mode is 2 S, and the vortex shedding will cause the local Nusselt number to increase abruptly near the rear stagnation point. In this study, the Nusselt number of the vibrating cylinder was significantly larger than that of the fixed cylinder, and the average Nusselt number increased by 5.73%.