弯曲输流管道流固耦合动力特性分析

V ol 35No.4Aug.2015噪声与振动控制NOISE AND VIBRATION CONTROL 第35卷第4期

2015年8月文章编号：1006-1355(2015)04-0043-05

弯曲输流管道流固耦合动力特性分析

俞树荣，马璐，余龙

(兰州理工大学石油化工学院，兰州730050)

摘要：管道中流体和弹性体之间的相互作用是引起管道振动的主要原因，这种流固耦合作用对管道动力特性有直接影响。以流固耦合理论为基础，对脉动压力作用下的弯曲输流管道建立流体动力学模型及固体运动模型，在ANSYS Workbench 中分别进行双向流固耦合受力分析、单双向流固耦合对比分析和模态分析，并考虑脉动压力，壁厚和管径等参数的影响。结果表明，弯管最大应力发生在入口和出口附近上下部，最大变形发生在转角及中间处；双向耦合作用下弯管最大等效应力与最大变形量均大于单向耦合；双向耦合作用下弯管固有频率明显降低，且固有频率随壁厚和管径的增大呈非线性增长。

关键词：振动与波；弯管；流固耦合；动力特性；模态分析

中图分类号：O353.1文献标识码：A DOI 编码：10.3969/j.issn.1006-1335.2015.04.010

Analysis of Dynamic Characteristics of Fluid-structure

Interaction in Curved Infusion Pipelines

YU Shu-rong ,MA Lu ,YU Long

(College of Petrochemical Engineering,Lanzhou Univ.of Tech.,Lanzhou 730050,China )

Abstract :Interaction between fluid and elastic solid in fluid-filled pipelines is the main cause of pipeline vibration,which has a direct impact on the pipeline ’s dynamic characteristics.In this paper,based on the theory of fluid-structure coupling,the fluid dynamics model and solid kinematic model were established for a curved liquid-filled pipe impacted by the fluctuating pressure.Force analysis of the double-path fluid-structure interaction and modal analysis were conducted by means of ANSYS Workbench software.The impacts of fluctuating pressure,wall thickness and diameter of the pipeline were taken into account.The results show that the maximum stress occurs at the upper and lower portions in the vicinity of inlet and outlet.The maximum deformation occurs at the corners and the middle of the pipeline.The maximum equivalent stress and maximum deformation of the pipeline under the double-path fluid-structure interaction were greater than those of the single-path interaction.The natural frequency of the curved infusion pipeline under the double-path fluid-structure interaction decreases significantly,and the natural frequency of the pipeline increases non-linearly with the increasing of the wall thickness and diameter of the pipeline.

Key words :vibration and wave ;curved infusion pipeline ;fluid-structure interaction ;dynamic characteristics ;modal analysis

随着当代经济和工程技术的发展，输流管道系

统已广泛应用于海洋工程、核工业、化工航空航天等

各个领域，能否保证管路系统的安全直接影响装备

收稿日期：2014－12－19

基金项目：国家质检公益基金资助（201310152）

作者简介：俞树荣（1962－），男，甘肃兰州人，工学博士，教

授，博士生导师，目前从事承压类特种设备强度与

安全。

E-mail:yusrlut@https://www.wendangku.net/doc/2617709390.html, 系统的正常工作[1]。输流管道系统在工作过程中不可避免地会由于系统操作或其他扰动等原因而产生非定常流动，这种非定常流动会产生压力脉动，从而激发管内流体振动，导致管道变形，而管道的变形反过来也会影响管内流体的流动。这种相互作用引起的振动可能导致管道及其附属部件发生松动甚至破裂，对装置安全、经济运行构成威胁[2]。输流管道流固耦合问题的研究有上百年历史，很多研究者对此作了贡献。文献[3]仅使用ANSYS 对不可压缩流体