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尝试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磷光波长特性进行温度测量。标定了激光照射后两种磷光波长的强度比与温度的变化关系。实验测试得到了该发动机在不同曲轴转角下缸内燃烧气体的二维温度分布,画出了测试平面上温度分布的柱状图,并根据标准偏差分析了不同曲轴转角下的温度分布结果,分析了燃烧的进展情况,通过与燃料燃烧质量分数划分的燃烧阶段相比较,验证了激光诱导磷光测温技术在发动机缸内燃烧温度研究中的可行性。
Attempts to apply laser-induced phosphorescence temperature measurement to the two-dimensional temperature measurement of engine cylinder gas. The principle is the use of Dy: YAG phosphor by 355 nm wavelength laser excitation after the radiation of the phosphorescent wavelength characteristics of the temperature measurement. The relationship between the intensity ratio of the two phosphorescent wavelengths and the temperature after the laser irradiation is calibrated. The two-dimensional temperature distribution of combustion gas in cylinder with different crank angle was obtained experimentally. The histogram of the temperature distribution in the test plane was plotted. The temperature distribution under different crankshaft angles was analyzed according to the standard deviation. The progress of combustion was compared with the combustion stage of mass fraction of fuel combustion to verify the feasibility of laser-induced phosphorescence temperature measurement in the study of combustion temperature in engine cylinder.