预测传热管涡致振动的改进尾流振子模型

A Modified Wake Oscillator Model for Predicting Vortex Induced Vibration of Heat Exchanger Tube

针对传热管的漩涡脱落诱发振动问题,在经典尾流振子模型的基础上,提出一种用于预测传热管涡致振动的改进尾流振子模型。计算结果与实验结果的对比显示,该模型能较好地模拟传热管涡致振动的重要特性。首先,通过研究发现,采用联合的位移耦合和加速度耦合模式,能较好地模拟柱体振动与漩涡脱落间的相互作用;其次,经典尾流振子模型中定义的经验参数为定常数,但通过分析发现,其经验参数应根据具体的结构参数来确定;最后,对改进的尾流振子模型所预测的结果与通过流固耦合数值模型计算得到的结果进行了对比分析,结果显示改进的尾流振子模型的结果与双向流固耦合模拟得到的结果吻合较好,说明尾流振子模型用于传热管的漩涡脱落诱发振动是可行的、合理的。

Base on the classical wake oscillator model, a new modified wake oscillator model is proposed, for predicting vortex induced vibration of heat exchanger tube in uniform current. The comparison between the new wake oscillator model and experimental show that the present model can simulate the characteristics of vortex induced vibration of tube. Firstly, the research ~ows that the coupled fluid-structure dynamical system should be modeled by combined displacement ahd acceleration mode. Secondly, the empirical parameter in wake oscillator model depends on the material properties of the structure, instead of being a universal constant. Lastly, the results are compared between modified wake oscillator model and fluid-structure interaction numerical model. It shows the present predicted results are compared to the fluid-structure interaction numerical data. The new modified wake oscillator model can predict the vortex induced heat exchanmer tube vibration feasibly.