发夹式换热器管束流致振动数值模拟研究

运用计算流体力学方法,采用ANSYS CFX软件对发夹式换热器的壳侧流场进行了三维数值模拟。流场计算中采用多孔介质模型对管束区域进行简化,分析了壳侧流场的速度分布,结果表明:直管段部分的流体湍流强度大于弯管段,且外层管束所在区域为高流速区,受流体冲刷严重。结合流场信息,通过功率谱生成随机激振力,采用ABAQUS软件模拟计算了湍流激振下管束的振动响应,结果显示管束的面外均方根位移远大于面内位移,且弯管部分的振动位移最大。该研究结果可为发夹式换热器的性能分析和优化设计提供参考和依据。

Numerical Simulation of Flow-induced Vibration in the Hairpin Type Heat Exchanger

3D numerical simulation of shell-side flow field in the hairpin type heat exchanger was carried out by ANSYS CFX software using the method of Computational Fluid Dynamics.The porous media model was used to simplify the tube bundle region in the flow field calculation,and the velocity distribution in the shell side was analyzed.The results show that the fluid turbulence intensity in the straight section was greater than that in the bend section,and the region where the outer tube bundles are located is the high flow velocity region,which was seriously scoured by the fluid.According to the flow field information,the random excitation force was generated using the power spectrum density.ABAQUS software was used to simulate and calculate the vibration response of the bundle under turbulent excitation.The results show that the out-of-plane root mean square displacements of the tubes were much larger than the in-plane displacements,and the vibration of the bend section was the largest.The study results provide a reference and basis for the performance analysis and optimization design of the hairpin type heat exchanger.