基于差压式流量计的大气总悬浮颗粒物采样器流量仿真研究  

Research on Flow Simulation of Atmospheric Total Suspended Particle Sampler Based on Differential Pressure Flowmeter

作　　者：王鑫慧[1] 康鹏桂[1] 周克媛[2] 张慧杰[1] Wang Xinhui;Kang Penggui;Zhou Keyuan;Zhang huijie(Qindao College,Qingdao Technological University,Qingdao,Shandong 266106,China;Mechanical and Electrical Engineering,Beijing Vocational and Technical College of Industry,Beijing 100042,China)

机构地区：[1]青岛理工大学琴岛学院,山东青岛266106 [2]北京工业职业技术学院机电工程学院,北京100042

出　　处：《机电工程技术》2021年第5期29-31,共3页Mechanical & Electrical Engineering Technology

基　　金：青岛理工大学琴岛学院科学技术课题(编号:QY20KB03)。

摘　　要：研究基于差压式流量计的大气总悬浮颗粒物采样器流量仿真问题,应用F LUENT流体仿真软件,对空气经过孔板前后的压力和速度进行仿真研究。仿真初始条件为空气密度1.29 kg/m^(3),入口速度100 L/min,温度22℃,大气压101.325 kPa,在上述工况下得到了空气经过流量计的压力分布云图、速度流线图以及在10~90 L/min流速区间内的差压数值。气体从锥形孔板经过时压力减小,流经流量计下端部时流量增大,从而产生了孔板前后的压差,孔板入口流速60 L/min时,压差很小,会影响采样泵的线性控制。该研究对于应用流体仿真软件对大气总悬浮颗粒物采样器流量差压式孔板流量计特性的研究提供了方向,不同流速差压的研究对孔板流量计结构的改进和优化有一定的指导和借鉴意义。The flow simulation of atmospheric total suspended particulate matter sampler based on differential pressure flowmeter was studied.FLUENT fluid simulation software was used to simulate the pressure and velocity of air before and after passing through orifice plate.The initial simulation conditions are air density 1.29 kg/m^(3),inlet velocity 100 L/min,temperature 22℃,atmospheric pressure 101.325 kPa.Under the above conditions,the pressure distribution neogram and velocity flow diagram of air passing through the flowmeter as well as the differential pressure value within the flow rate range of 10~90 L/min were obtained.The pressure decreases when the gas passes through the tapered orifice plate,and the flow rate increases when it flows through the lower end of the flowmeter,resulting in the pressure difference between the orifice plate and the orifice plate.When the orifice inlet flow rate is 60 L/min,the pressure difference is very small,which will affect the linear control of the sampling pump.This study provides a direction for the application of fluid simulation software to the characteristics of the orifice flowmeter of atmospheric total suspended particulate matter sampler,and the study of different velocity differential pressures has certain guidance and reference significance for the improvement and optimization of the orifice flowmeter structure.

关 键 词：采样器 流量计 差压 孔板 

分 类 号：TH814[机械工程—仪器科学与技术]