摘要
目前对于涡街流量计的最佳取压位置研究主要集中在二维流场,但这不能更生动准确的反映出三维流场特性。采用Ansys+Workbench+FLUENT数值仿真软件平台,根据涡街流量计的物理结构尺寸建立仿真模型。并将仿真模型进行网格划分,从而对求解域进行离散,再通过N-S方程进行求解计算,将仿真得到的卡门涡街脱落频率与实验结果比较,得出两者之间的最大误差不超过5.8%,数据表明可以利用FLUENT软件对涡街流量计进行数值仿真。最后利用FLUENT软件,在不同流速下,通过设置多个检测点,对各点信号强度和频谱分布进行比较分析,得出目前最常用的三角柱旋涡发生体的最佳取压位置位于管道中轴线,距离发生体尾部1.4d(d为旋涡发生体截流面的宽度)的位置处。
The research of flow field on optimal pressure tapping position of vortex flowmeter focused on two-dimensional at present,but it cannot strongly reflect the three-dimensional characteristics of flow field.The simulation model is built based on the actual physical vortex flowmeter size by using Ansys ＋ Workbench ＋ FLUENT software.Then divided the simulation model into grids to discrete solving domain.Then use the N-S equation to get result.After comparing the frequency of Karman vortex generating body with test data,concluded that the error is less than 5.8 ％.The simulator result shows that use FLUENT to numerical simulation is feasible.Compare and analysis the signal strength with spectrum distribution in different generated detection point at different velocity,the optimal pressure tapping position is after vortex generating body,1.4 times of cut-off face and in the pipeline axis.
出处
《电子测量技术》
2015年第3期1-4,共4页
Electronic Measurement Technology
关键词
涡街流量计
FLUENT
数值仿真
取压位置
vortex flowmeter
FLUENT
numerical simulation
pressure tapping position
