| 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. |
| Wall Temperature Measurement with Flame Impingement via Laser-Induced Phosphorescence |
| DOI：10.13949/j.cnki.nrjgc.2021.06.004 |
| Key Words:phosphor thermometry wall temperature flame impingement excitation fluence coating thickness |
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| 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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