激光诱导磷光测温技术在缸内温度测量中的应用

Two-Dimensional Gas-Phase Temperature Measurements in Engine Using Laser-Induced Phosphorescence Thermometry

将激光诱导磷光测温技术应用到发动机缸内气体的二维温度测量中.其原理是利用Dy:YAG磷光剂受355 nm波长的激光激发后辐射的458 nm和494 nm磷光强度比进行温度测量,实验在一台侧向换气的光学发动机上进行,测试了该发动机压缩行程的二维温度分布,与由缸压计算的缸内平均温度比较,误差均小于5%.

In the present work,the feasibility of using laser-induced phosphorescence thermometry for 2D gas-phase temperature measurement in engine has been investigated.The intensity ratio of Dy：YAG phosphor after excited by 355,nm,i.e.458 nm and 494 nm,has been used for temperature measurement.The tests have been performed in a side-induction optical engine and the 2D temperature distribution was measured in compression stroke.The mean phosphor temperature data agreed well with the thermodynamic calculated data from the cylinder pressure,with an error of less than 5%.