Numerical analysis on shell-side flow induced vibration responses of multi-row elastic tube bundles in heat exchanger
JI Jia-dong 1 GE Pei-qi 1, 2 BI Wen-bo 1
1. School of Mechanical Engineering, Shandong University, Jinan 250061；
2. Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, Jinan 250061
The vibration characteristics of the elastic tube bundle with single and multi-row generated by shell-side cross flow are numerical studied, and the sequential solution method of bi-directional fluid-structure coupling is used to investigate the vibration responses of the elastic tube bundle. Numerical results show that the in-plane vibration is displayed when the elastic tube bundle subjected to shell-side cross flow. There are significantly harmonic frequencies of the monitor points in all directions. In addition, the flow-induced vibration interacts with each other between the rows of the elastic tube bundles, and the top part of the elastic tube bundles has lower vibration frequency. The elastic tube bundle at the bottom has the lowest vibration intensity, and the vibration intensity of the remaining tube bundles decrease gradually from the bottom to the top. On the other hand, the vibration equilibrium position of the elastic tube bundle at the bottom is higher than the elastic tube bundle plane, while the vibration equilibrium positions of the remaining tube bundles are lower than the elastic tube bundle plane. More deeply, vibration equilibrium positions of the elastic tube bundles decrease from the bottom to the top and stabilized gradually.
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