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| Numerical analysis on flow-induced vibration responses of elastic tube bundle |
| JI Jia-dong1，GE Pei-qi1, 2，BI Wen-bo1 |
1. School of Mechanical Engineering, Shandong University, Jinan 250061，China；
2. Key Laboratory of High Efficiency and Clean Mechanical Manufacture of Ministry of Education, Jinan 250061,China |
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Abstract Based on the weak coupling method of fluid-structure interaction, the vibration characteristics of the elastic tube bundle subjected to shell-side or/and tube-side cross flow are studied under different water inlet velocities. Numerical results show that the flow-induced vibration amplitude increases with increasing shell-side or/and tube-side water inlet velocity. However, the amplitude of shell-side flow-induced vibration is greater than that of tube-side flow-induced vibration with the same water inlet velocity. The flow-induced vibration frequency of the monitoring point increases with increasing shell-side water inlet velocity, and substantially unchanged when the tube-side water inlet velocity increases. Furthermore, the vibration curves of shell-side and tube-side flow-induced vibration are similar to the curves of shell-side flow-induced vibration. It is indicated that the vibration is mainly induced by the shell-side water. On the other hand, the vibration amplitudes of the monitoring points in y and z directions are gradually approaching the peak when the flow-induced vibration frequency is close to the first natural frequency of the elastic tube bundle. Additionally, the elastic tube bundle subjected to shell-side cross flow is mainly for in-plane vibration.
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Received: 14 July 2015
Published: 15 March 2016
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