摘要
研究了流弹失稳流体力模型.选取阻尼机理控制下的流弹稳定性问题为研究对象,在多种入口流速下对正三角形排列管束结构中单管可动情况的流致振动过程进行了模拟.用管子速度和位移的多项式函数作为流体力模型,结合流体力和管子位移数值模拟结果,计算了流体力系数.对不同流速工况下的流体力系数与流速之间的关系进行拟合,将流速的影响引入到流体力模型中.最终得到了与管子速度、位移以及入口流速相关的流体力模型.用建立起的流体力模型对管束结构流弹失稳临界流速进行了预测,结果较好.这种以管束结构流致振动数值仿真为基础,结合给定的函数形式建立起的流体力模型,能反映管束结构和流体相互作用过程中的主要特征,该模型对流弹失稳临界流速有一定的预测能力.
To study the fluidelastic instability(FEI)fluid force model,the FEI process controlled by the fluid damping mechanism was taken as the research object,and the fluid-tube interaction was simulated with one elastic tube in the middle of a normal-triangle tube array under a series of free stream flow velocities.A polynomial function was chosen as the fluid force model,the simulated fluid forces and the tube displacements were used to calculate the unknown coefficients in the fluid force model.The influence of the flow velocity on the fluid force model was introduced and the relationship between fluid force coefficients and inlet flow velocities was fit.A fluid force model related to tube displacements,tube velocities and flow velocities was obtained.The predicted FEI critical flow velocities with the proposed fluid force model were compared to the experimental data and numerical results given by literatures.The fluid force model,constructed with the proposed method based on numerical results and the given mathematical function,can capture the main characteristics in the flow tube array interaction,and reasonably predict the FEI critical velocity.
作者
刘建
张毅雄
冯志鹏
叶献辉
陈果
齐欢欢
LIU Jian;ZHANG Yixiong;FENG Zhipeng;YE Xianhui;CHEN Guo;QI Huanhuan(Science and Technology on Reactor System Design Technology Laboratory,Nuclear Power Institute of China,Chengdu 610213,P.R.China)
出处
《应用数学和力学》
CSCD
北大核心
2020年第5期499-508,共10页
Applied Mathematics and Mechanics
基金
国家自然科学基金(51606180,11872060)。
关键词
管束结构
流致振动
计算流体力学
流体力模型
流弹失稳
tube array
flow-induced vibration
computational fluid dynamics
fluid force model
fluidelastic instability
