A method to improve accuracy of hot-wire probe calibration under variable temperature field

WANG Ye1,2, HU Jiazhi1, GUAN Guoxiang1

（1. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China；2. Key Laboratory of Railway Vehicle Thermal Engineering, Ministry of Education of China,Lanzhou Jiaotong University, Lanzhou 730070, China）

Abstract： The probe calibration wind tunnel of IFA300 hot-wire anemometer system cannot complete the probe calibration at a given temperature and low flow rate, because the side wall of the calibration wind tunnel has high thermal conductivity. That is to say, when the air flows through the calibration wind tunnel, its temperature will decrease sharply. In view of this structural defect, a measure method is put forward to maintain the temperature of the calibrated airflow by heating the side wall of the calibrated wind tunnel, which greatly widens the temperature range of the calibrated low-speed airflow. This measure adopts repetitive experimental methods to effectively improve the accuracy of the calibration results. The relative error of the test is controlled under 1% for the calibration airflow with temperature from 20 ℃ to 58 ℃， which is much higher than the design accuracy of the IFA300 hot-wire anemometer. In order to adapt to the test of the flow parameters in an enclosed cavity, a set of probe anti-collision control system is designed and manufactured, and the hot-wire probe has been protected well. The temperature and average velocity in the outer normal direction at different heights of the hot wall of the enclosed cavity are measured, which is in good agreement with the literature results.

Key words： variable temperature field; IFA300 hot-wire anemometer; calibration; enclosed cavity; repetitive experiment

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变温度场下提高热线探针标定精度的方法

王烨1,2， 胡佳志1， 管国祥1

（1. 兰州交通大学 环境与市政工程学院， 甘肃 兰州 730070；2. 兰州交通大学 铁道车辆热工教育部重点实验室， 甘肃 兰州 730070）

摘要：IFA300热线风速仪系统自带的探针标定风洞由于散热快、 低速气流流过时温度锐减， 无法完成给定温度、 小流量时的探针标定。 针对这一结构缺陷， 本文提出了通过加热标定风洞侧壁的方式来维持标定气流温度， 拓宽了标定低速气流的温度范围。 采用重复性的实验研究方法， 有效提高了标定结果的准确性。 将温度跨度在20 ℃-58  ℃之间流体的标定结果的相对偏差控制在1%以内， 远高于IFA300热线风速仪的设计精度。 为适应对完全封闭腔内流动参数的测试， 本文设计制作了一套探针防碰撞控制系统， 大幅降低了探针的坏损率， 同时实测了封闭腔热壁面不同高度处外法线方向上的温度及平均速度， 与文献结果吻合较好。

关键词：变温度场； IFA300热线风速仪； 标定； 封闭腔； 重复性实验

引用格式：WANG Ye, HU Jiazhi, GUAN Guoxiang． A method to improve accuracy of hot-wire probe calibration under variable temperature field． Journal of Measurement Science and Instrumentation， 2023， 14（2）： 164-173. DOI： 10．3969／j．issn．1674-8042．2023．02．005

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