横风环境下空气负氧离子测量仪设计与优化  

Design and optimization of air negative oxygen ion measuring instrument in cross wind environment

作　　者：胡斌 章为 曾松伟[3] HU Bin;ZHANG Wei;ZENG Songwei(College of Mathematics and Computer Science,Zhejiang A&F University,Hangzhou 311300,China;Hangzhou Lin’an District Highway Service Center,Hangzhou 311300,China;College of Optical Mechanical and Electrical Engineering,Zhejiang A&F University,Hangzhou 311300,China)

机构地区：[1]浙江农林大学数学与计算机科学学院,浙江杭州311300 [2]杭州市临安区公路服务中心,浙江杭州311300 [3]浙江农林大学光机电工程学院,浙江杭州311300

出　　处：《传感器与微系统》2023年第11期96-99,104,共5页Transducer and Microsystem Technologies

基　　金：国家自然科学基金两化融合重点资助项目(U1809208);浙江省自然科学基金公益资助项目(LGN18C200017)。

摘　　要：为减少环境风引起的空气流量变化所导致的负氧离子浓度测量误差,在分析双轴圆筒轴式离子收集器内空气流量变化机理和不同防风结构的负氧离子测量仪在横风环境下的内流场分布情况的基础上,利用计算流体力学(CFD)仿真软件对各结构的防风效果进行研究,提出了一种基于防风台结构的负氧离子测量仪设计,并通过CFD仿真确定了防风台的底角及高差比等关键参数。仿真结果表明:防风台的底角的最佳取值角度为50°,高差比的最佳取值为2.5。与其他防风结构对比结果表明:所设计的防风式离子收集器在横风环境下可使管内风速变化率减小49.7%以上,且收集区域内流速均匀,满足调节极化电压提高离子浓度测量精度的流体状态要求。In order to reduce the negative oxygen ion concentration measurement error caused by the change of the air flow caused by the ambient wind,on the basis of analyzing on change mechanism of the air flow in the biaxial cylinder type ion collector and the internal flow field distribution of the measuring instrument with different wind-proof structures under the cross wind environment.Using computational fluid dynamics(CFD)simulation software to study the wind-proof effect of each structure,a design of negative oxygen ion measuring instrument based on wind-proof structure is proposed,and through CFD simulation,the key parameters such as the bottom angle and height difference ratio of the wind-proof platform are determined.The simulation results show that the optimum value angle of the bottom angle of the wind-proof platform is 50°,and the optimum value angle of the height-to-difference ratio is 2.5.Compared with other wind-proof structures,the wind-proof type ion collector can reduce the wind speed change rate in the tube by more than 49.7% in the cross wind environment,and the flow velocity in the collection area is uniform,which meet the fluid state requirement of adjusting polarization voltage to improve the precision of ion concentration measurement.

关 键 词：负氧离子 测量误差 离子收集器 防风结构 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TH765[自动化与计算机技术—控制科学与工程] TN02[机械工程—仪器科学与技术]