薛雪峰,李铁,王宁,陈润,张小卿.基于激光诱导磷光的火焰碰壁时壁温测试技术研究[J].内燃机工程,2021,42(6):23-29.
基于激光诱导磷光的火焰碰壁时壁温测试技术研究
Wall Temperature Measurement with Flame Impingement via Laser-Induced Phosphorescence
DOI：10.13949/j.cnki.nrjgc.2021.06.004
关键词:磷光测温  壁面温度  火焰撞壁  激发光通量  涂层厚度
Key Words:phosphor thermometry  wall temperature  flame impingement  excitation fluence  coating thickness
基金项目:国家自然科学基金重点国际(地区)合作研究项目(52020105009)
作者单位
薛雪峰,李铁,王宁,陈润,张小卿 1.上海交通大学 海洋工程国家重点实验室，上海 201100；2.上海交通大学 动力装置及自动化研究所，上海 201100 
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摘要:以氟锗酸镁掺杂四价锰离子（Mg28Ge7.5O38F10：Mn4+,MFG：Mn4+）为磷光剂，建立了基于高速摄影的激光诱导磷光衰减寿命法测温试验系统，并探究了激发光通量和磷光涂层厚度对磷光测温结果的影响。利用该方法测量了预混丁烷火焰撞壁时一维壁面温度分布，并与薄膜热电偶测温结果进行对比，验证了激光诱导磷光测温方法的可行性。结果显示，温度低于265.3℃时激发光通量在0~1.02mJ/cm2内对测温结果无明显影响，温度高于265.3℃时磷光衰减寿命随激发光通量增大而延长，1.02mJ/cm2时达到饱和。磷光涂层厚度对激光诱导磷光测温结果无明显影响。相比于薄膜热电偶，激光诱导磷光测温结果更能反映壁面温度分布的真实情况，且对壁面温度的空间变化更具敏感性。
Abstract:The high-speed temperature measurement system of laser-induced phosphorescence(LIP) lifetime method was established by using the phosphor of Magnesium fluorogermanate doped with tetravalent manganese ions( Mg28Ge7.5O38F10：Mn4+,MFG：Mn4+). The effects of excitation fluence and phosphor coating thickness on the temperature measurement were investigated. Also, the 1D wall temperature distribution was acquired by the LIP measurement of the premixed butane impinging flame. And the comparison of LIP temperature measurement and thin-film thermocouple was conducted, which verifies the feasibility of the LIP method. The results show when the temperature is lower than 265.3℃, the excitation fluence within 0~1.02mJ/cm2 has no significant impact on the temperature measurement results. When the temperature is higher than 265.3℃, the phosphorescence lifetime is extended as the excitation fluence increases, and reaches the saturation at 1.02mJ/cm2. The phosphor coating thickness has little effect on the LIP temperature measurement. In general, the LIP method favors a good quantitative measurement closer to the truth temperature and a higher sensitivity to spatial fluctuation compared with the thin-film thermocouple.
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