摘要
结合原弹性管束的结构及工作特点,提出了弹性管束的优化结构。理论推导了弹性管束的端部受力特性,并采用实验与数值模拟相结合的方法对管束振动特性进行研究,得到了其面外、面内振动的振型、固有频率。实验结果表明,与原弹性管束相比,新型弹性管束端部截面所受弯矩不足原管束的1/6,安全性能有了较大提高;固有频率较原管束低,更易于在外流的激励下产生振动;单位容积的传热面积相应增加24.7%。
An optimizd structure of elastic tube bundle was proposed considering the structure and operating features of the original type. The mechanical properties of the end region of the elastic tube bundle were deduced theoretically, and thorough researches were carried out on the inherent vibration characteristics of the tube bundle by the combinatior ex- periment and numerical simulation. The modes of the out-of-plane and in-plane vibration, natural frequency of the tube bundle were obtained. The experiment results showed that the bending moment endured in the end section of the new e- lastic tube bundle was one sixth times less than that of the original tube bundle, which improved the safety property significantly. The natural frequency was lower than that the original of tube bundle, which make it easier for the tube bundle to vibrate under the stimulation of external flow. The heat transfer area per unit volume increased by 24. 7% accordingly.
出处
《山东大学学报（工学版）》
CAS
北大核心
2012年第4期132-136,142,共6页
Journal of Shandong University（Engineering Science）
基金
国家重点基础研究发展计划资助项目(No.2007CB206903)
关键词
强化传热
振动
弹性管束
有限元
模态分析
heat transfer enhancement
vibration
elastic tube bundle
finite element
modal analysis
