摘要
当冷空气流过一个通电的发热线圈时,线圈的温度会降低,其最终的温度取决于空气流速。对一个钨线圈通以恒定电流,将其置于风场中,用台式万用表测量线圈两端电压而得到其电阻,再利用电阻温度特性测得线圈温度,以此达到测量风速的目的。本文将详细探究这一物理过程,从实验进行验证,最终得到一种可靠的测量风速的方法。研究表明:该方法具有较高的测量精度和较短的响应时间,对流场干扰小。
When cold air flows over an energized hot coil,the temperature of the coil will decrease,and the final temperature depends on the wind speed.Apply a constant current to a tungsten coil which is placed in the wind field,measure the voltage at both ends of the coil using a desktop multimeter to obtain its resistance,and then use the resistance temperature characteristic to measure the coil temperature,in order to achieve the purpose of measuring wind speed.This paper will explore this physical process in detail,validate it through experiments,and finally obtain a reliable method for measuring wind speed.The results show that this method has high measurement accuracy,short response time,and little convection field interference.
作者
林品臻
江云坤
冯柏赫
黄碧华
LIN Pinzhen;HUANG Bihua;FENG Baihe;JIANG Yunkun(College of Physics and Information Engineering,Fuzhou University,Fuzhou,Fujian 350108)
出处
《物理与工程》
2023年第6期85-89,共5页
Physics and Engineering
基金
福州大学大学生科研训练计划(No.27180)。
关键词
强制对流
热传导
电阻温度特性
电流热效应
恒流法
forced convection
thermal conduction
temperature coefficient of resistance
thermal effect of electric current
constant current method
