基于激光诱导荧光的液膜温度场测量  

Measurement of Temperature Field of Liquid Film Based on Planar Laser-Induced Fluorescence

作　　者：薛婷[1,2] 赵世杰[1,2] 张尚臻 Xue Ting;Zhao Shijie;Zhang Shangzhen(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;Tianjin Key Laboratory of Process Measurement and Control,Tianjin 300072,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072 [2]天津市过程检测与控制重点实验室,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2017年第7期748-752,共5页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(61372143;61671321)~~

摘　　要：将激光诱导荧光(PLIF)技术应用于自由降膜的温度场测量,非侵入、可视化地揭示了液膜的二维温度场分布和传热过程.提出了基于灰度优选平均的荧光强度提取方法,以及基于二维平面激光校准的液膜温度场测量方法,将液膜标定曲线的拟合相对误差由11.19%,减少至3.73%,,有效提高了PLIF测温的准确性.与PT1000测温对比实验结果表明,PLIF液膜测温最大相对误差低于3%,,多数情况下相对误差低于2%,,测温结果具备准确性和可靠性,可以有效实现液膜温度场的测量.Temperature field of the falling film was measured by planar laser-induced fluorescence(PLIF)technique,which can visualize the two-dimensional temperature field of the liquid film obviously and reveal the transient heattransferprocess non-intrusively.An extraction method of fluorescence intensity based on the optimized average grayvalues was presented,and a temperature field measurement method of liquid film based on the two-dimensional planarlaser calibration was proposed.The relative error of fitting calibration curve of liquid film was reduced from11.19%,to3.73%,,which effectively improved the temperature measurement accuracy of PLIF.Comparison of experimentalresults between PLIF and PT1000shows that the maximum relative error by PLIF is less than3%,andrelative error is less than2%,in most cases.Therefore the temperature measurement results are accurate and reliable,which ensures the effective measurement of the temperature field of liquid film.

关 键 词：垂直自由降膜 温度场 激光诱导荧光 荧光强度 校准 

分 类 号：TN247[电子电信—物理电子学]