不同截流程度下涡街流量计的流动特性研究  

Characteristics of vortex flowmeter under different closure degree

作　　者：宋佳忆 李斌[1] 陈洁[1] 樊辰阳 黄绍锋[1] 

机构地区：[1]上海大学机电工程与自动化学院,上海200072

出　　处：《电子测量技术》2015年第6期1-4,共4页Electronic Measurement Technology

摘　　要：对于涡街流量计的旋涡发生体的仿真研究主要集中在形状和尺寸上,但在现场复杂工况环境的情况下,发生体的位置并不是固定不变的,会存在安装偏差。为了很好的分析发生体安装偏差带来的信号强度发生变化的问题,确定不影响信号强度的最大偏差角度,采用三角柱型发生体,在Ansys＋Workbench＋FLUENT数值仿真软件平台环境下,根据涡街流量计的实际物理结构尺寸建立仿真模型,并对其进行网格划分、求解,将仿真得到的升、阻力频率相比较,得出阻力频率正好是升力频率的2倍,表明可以利用FLUENT软件对涡街流量计进行三维流场数值仿真。最后利用FLUENT软件,通过改变管截面与截流面的夹角,在低、中、高速流速下,对其进行取压,将得到的信号强度和频谱分布进行比较分析,得出夹角与信号强度的关系：夹角在1°~7°范围,对信号强度的影响不大,超过7°以后影响变大。At present ,the research of vortex shedder focused on shedder shape and size ,but in the field of complex environmental conditions ,the location of shedder is not fixed ,there will have a certain amount of error .For a good analysis of problems about changed signal strength with spectrum brought by misalignment of the vortex shedder ,the simulation model is built based on the actual physical vortex flowmeter size with the shape called triangular prism of vortex shedder by using Ansys＋ Workbench＋ FLUENT software .Then divided the simulation model into grids and get the result .After comparing the frequency of lift force with drag force ,concluded that the Resistance frequency is as twice as the Lift frequency . The simulator result shows that use FLUENT to numerical simulation is feasible . Compare and analysis the signal strength with spectrum distribution at low ,medium and high velocity by changing the angle between the surface of the pipe cross‐section and closure .Thus we obtains the relationship between the angle of the signal strength ：The effect on the signal strength is small when angle in the range of 1 degree to 7 degrees ,and larger impact more than 7 degrees .

关 键 词：涡街流量计 FLUENT 数值仿真 截流夹角 

分 类 号：TP391.1[自动化与计算机技术—计算机应用技术]