孙立军^1,2, 王彩红¹, 张涛^1,2, 昝焕杰¹
AuthorsHTML:孙立军^1,2, 王彩红¹, 张涛^1,2, 昝焕杰¹
AuthorsListE:Sun Lijun^1,2, Wang Caihong¹, Zhang Tao^1,2, Zan Huanjie¹
AuthorsHTMLE:Sun Lijun^1,2, Wang Caihong¹, Zhang Tao^1,2, Zan Huanjie¹
Unit:1. 天津大学电气自动化与信息工程学院，天津 300072；2. 天津福路瑞特测控技术有限公司，天津 300384
Unit_EngLish:1．School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
2．Tianjin Flowrate Measurement and Control Technology Company Limited, Tianjin 300384, China
Abstract_Chinese:为了优化整流翼型均速管流量传感器的截面形状, 通过计算流体力学仿真及实流实验, 研究翼尖平切、圆切、翼尖宽度、翼尖圆弧半径对传感器性能的影响, 分析翼尖形状变化影响传感器性能的流体力学机理, 研究最优翼尖尺寸随管径变化的规律．仿真和实验结果表明：翼尖平切优于圆切; 翼尖宽度或翼尖圆弧半径0.3 mm的方案线性度较好; 截面形状相同时, 外接圆直径8 mm的方案仪表系数较小; 翼尖形状决定流体流动分离位置, 影响检测杆下游漩涡区域的形状, 漩涡宽度和长度的比值可以表达漩涡的形状, 该比值越小, 传感器的线性度和重复性越好; DN50～DN300管径均速管的最优翼尖平切尺寸与管径大小之间符合指数和对数变化规律, 为不同管径传感器截面形状的优化设计提供了依据．
Abstract_English:The objective of this research is to optimize the cross-sectional shape of averaging Pitot tube(APT)flow sensors with flow conditioning wing(FCW). The effects of flat cutting and circle cutting wingtip shapes，wingtip width and wingtip arc radius on the performance of APT flow sensors were investigated through computational fluid dynamics(CFD)simulation and real-flow tests. The fluid dynamics mechanism behind the performance of sensors impacted by the wingtip shape variation was analyzed. The law of optimal wingtip sizes changing with the pipeline diameters was also studied. Both the simulation and tests results show that the flat cutting wingtip shapes are better than the circle cutting wingtip shapes，the schemes with a wingtip width or wingtip arc radius of 0.3 mm have a good linearity，and the schemes with a circumscribed circle diameter of 8 mm have a smaller meter factor under the same cross-sectional shapes. The wingtip shape determines the position of fluid flow separation，and affects the shape of the vortex area downstream the detecting tube. The ratio of vortex width to length can express the vortex shape: the smaller the ratio，the better the linearity and the repeatability of the sensor. The optimal flat cutting wingtip size of the sensors and the pipeline diameters in the range of 50 mm to 300 mm follow the exponential and logarithmic rules. The optimal rules provide a foundation for optimizing design of the cross-sectional shape of APT flow sensors with FCW under different pipeline diameters.
Keyword_Chinese:均速管流量传感器; 整流翼型; 翼尖形状; 计算流体力学; 线性度; 仪表系数
Keywords_English:averaging Pitot tube(APT) flow sensor; flow conditioning wing; wingtip shape; computational fluid dynamics; linearity; meter factor

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