Assessment and application of phosphor thermometry for spatially resolved surface temperature measurements during downward flame spread
Assessment and application of phosphor thermometry for spatially resolved surface temperature measurements during downward flame spread
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荧光体测温法在向下火焰传播过程中空间分辨表面温度测量的评估和应用
DOI：
10.1016/j.fuel.2024.131201
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发表时间：
2024
期刊：
影响因子：
7.4
通讯作者：
Burnford J
中科院分区：
文献类型：
--
作者：
Burnford J
固体表面上的火焰传播是评估材料火灾危险性的关键指标。火焰传播问题的核心是固体燃料的热传递。燃烧固体表面温度的精确测量对于描述驱动火焰传播的传热机制是必要的。本文采用荧光测温法测量了聚甲基丙烯酸甲酯（PMMA）样品向下火焰传播过程中的时空表面温度。使用荧光粉Gd 3 Ga 5 O 12：Cr，Ce测量23 × 23 mm 2区域内的表面温度，图像分辨率为410 µ m/pixel。CH * 化学发光成像与磷光体测温一起进行，以测量火焰蔓延速率并评估相对于火焰位置的表面温度。这项工作调查的局限性和需要充分测量表面温度在火焰蔓延的情况下，使用磷光体测温的考虑。首先研究了防止干扰火焰传播过程的最佳磷光体涂层厚度。厚度为6 µ m和4 µ m的磷光体涂层阻碍了火焰传播速率并改变了火焰形状，因此证明对于该应用来说太具侵入性。2 μ m的涂层厚度，提供了0.55/0.45的磷光体与PMMA表面比，对火焰传播行为没有可测量的影响，并提供了可靠的2D表面温度测量。在这项工作中提出的磷光体测量表现出类似的热电偶的可靠性，但提供空间分辨的表面温度，并提供测量访问火焰片下面的表面。研究结果报告了火焰前沿、火焰前缘和火焰下方的热解区域的二维时空表面温度测量结果。详细的表面温度测量下的火焰片是新颖的磷光体测温法的使用，以前没有记录。这项研究展示了这种诊断技术在火焰传播的背景下，并显示了这些方法应用于其他固体燃料相关研究的潜力。
Flame spread over a solid surface is a critical metric in assessing the fire hazard of a material. At the core of the flame spread problem is heat transfer to and within the solid fuel. Accurate measurement of surface temperature on the burning solid is necessary to describe the heat transfer mechanisms which drive flame spread. This work employs phosphor thermometry to measure the spatiotemporal surface temperature during downward flame spread over polymethyl methacrylate (PMMA) samples. The phosphor Gd 3 Ga 5 O 12: Cr, Ce is used to measure the surface temperature in a 23× 23 mm 2 area with an image resolution of 410 µm/pixel. CH* chemiluminescence imaging is performed alongside phosphor thermometry to measure the flame spread rate and evaluate the surface temperature relative to the flame position. This work investigates the limitations and considerations required to adequately measure surface temperatures in a flame spread scenario using phosphor thermometry. The optimal phosphor coating thickness to prevent interference with the flame spread process is first investigated. Phosphor coating thicknesses of 6 µm and 4 µm impeded flame spread rate and altered the flame shape–thus proving too invasive for this application. A coating thickness of 2 µm, which provided a phosphor to PMMA surface ratio of 0.55/0.45, had no measurable effect on the flame spread behavior and provided reliable 2D surface temperature measurements. The phosphor measurements presented in this work exhibit a similar reliability to a thermocouple, but provide spatially resolved surface temperatures and provide measurement access to the surface underneath the flame sheet. The findings report 2D spatiotemporal surface temperature measurements ahead of the flame front, at the flame’s leading edge, and in the pyrolyzing region immediately beneath the flame. Detailed surface temperature measurements underneath the flame sheet are novel to the use of phosphor thermometry and have not been previously recorded. This study showcases this diagnostic technique in the context of flame spread, and shows the potential of applying these methods to other solid-fuel related research.
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