考虑流体附加质量的输流管道振动特性分析

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摘要针对管内流体激励(flow-induced vibrations,FIV)引起的结构振动问题，考虑单向流固耦合作用，通过引入附加质量分析内流流速对结构振动特性的影响。以两端固定支撑输流直管作为研究对象，利用数值方法模拟不同流速下管内的流动状态，获取流体压力系数、湍动能及管道结构位移响应。基于单向耦合振动机理，建立管道流固耦合附加质量模型，采用FEM方法展开结构模态分析，计算流体作用于结构的附加质量和固有频率。数值仿真结果表明：内部流体流速对管道结构振动有较强的耦合作用，流速增加使得耦合附加质量增大，且存在临界流速使管道发生静态屈曲失稳现象。与经验公式对比，该计算结果在10%的误差范围内能更准确地反映流体对结构振动的单向耦合作用。因此，提出的方法能够应用于单向耦合振动问题分析，并为研究流固耦合对结构动力特征影响等管内流动的FIV问题提供思路。

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	肖斌
	周玉龙
	高超
	曹贻鹏
	石双霞
	刘志刚

关键词 ：流固耦合, 流体附加质量, 流激振动, 弯曲固有频率, 输流管道

Abstract：Aiming at problems of fluid-induced vibration (FIV) of structures, considering unidirectional fluid-structure interaction (FSI), effects of flow velocity on vibration characteristics of structure were analyzed through introducing added mass. A straight pipeline conveying fluid was taken as the study object, flow states in pipeline under different flow velocities were simulated with numerical method to obtain fluid pressure coefficient, turbulent kinetic energy and displacement response of pipeline structure. Based on the unidirectional coupling vibration mechanism, the pipeline FSI added mass model was established. The FE method was used to do the structural modal analysis, and calculate the structure’s added mass and natural frequencies due to fluid acting on structure. The numerical simulation results showed that pipeline internal fluid velocity has stronger coupling action on pipeline structure vibration, increase in flow velocity makes coupling added mass increase, and there is a critical flow velocity to cause pipeline having static buckling instability; compared with empirical formula, the calculation results here can more accurately reflect the fluid unidirectional coupling action on structural vibration within the error range of 10%; the proposed method can be applied in analysis of unidirectional coupled vibration problems, and provide a way for studying FIV problems in pipeline flow including effects of FSI on dynamic characteristics of structures.

Key words： fluid-structure interaction (FSI) fluid added mass flow-induced vibration (FIV) flexural natural frequency pipeline conveying fluid

收稿日期: 2020-02-19 出版日期: 2021-08-15

引用本文:

肖斌，周玉龙，高超，曹贻鹏，石双霞，刘志刚. 考虑流体附加质量的输流管道振动特性分析[J]. 振动与冲击, 2021, 40(15): 182-187.
XIAO Bin, ZHOU Yulong, GAO Chao, CAO Yipeng, SHI Shuangxia, LIU Zhigang. Analysis of vibration characteristics of pipeline with fluid added mass. JOURNAL OF VIBRATION AND SHOCK, 2021, 40(15): 182-187.

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http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2021/V40/I15/182

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