High-speed Imaging of Temporal Thermal Field in Thermoplastic Material during Flame Spread
High-speed Imaging of Temporal Thermal Field in Thermoplastic Material during Flame Spread
复制标题
热塑性材料火焰传播过程中时间热场的高速成像
DOI：
10.1117/12.2270460
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Yuji Nakamura
中科院分区：
文献类型：
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作者：
Tsuneyoshi Matsuoka;Takafumi Yamazaki;Yuji Nakamura
为了可视化透明热塑性材料燃烧过程中气固两相的二维、随时间变化的温度分布，我们开发了一种带有高速摄像机的实时全息干涉测量系统。本研究的最终目的是促进火焰传播模型的升级，在该模型中，复杂的物理过程（如燃料回归、气泡形成、熔融层内部运动）大多被忽视，尽管这些影响不是那么广为人知，也没有得到很好的研究。首先，研究了热塑性材料在气相扰动下的热响应。以透明PMMA厚板为试样，研究了火焰向下蔓延过程中气相、熔融相和固相的热状态。对整个光学装置进行了精心布置和调谐，得到了燃烧过程中气相和固相出现的令人满意的清晰干涉条纹。在系统中引入扰动后，通过高速摄像机记录了气相、熔融相和固相的折射率随时间的变化以及相应的温度分布。详细分析了响应延迟时间，讨论了液相对燃烧特性的潜在影响。
We have developed a real-time holographic interferometry system with high-speed camera in order to visualize two dimensional, time-dependent temperature distributions in gas and solid phases simultaneously during the combustion of transparent thermoplastic material. The ultimate goal of this study is to contribute to upgrade the flame spread modeling at which the complex physical processes (e.g., fuel regression, bubble formation, motion inside the molten layer) have been mostly ignored, although those effect are not so well-known and not well-studied. As first step, thermal response of thermoplastic material subjected to the disturbance in gas phase was investigated. Thick transparent PMMA slab was used as sample specimen and the thermal status in gas, molten and solid phases over spreading flame downwardly was examined. Whole optical set was carefully arranged and tuned to obtain satisfactory clear interference fringes appeared in gas and solid phases during the combustion event. Following the disturbance introduced in the system, the time change of refractive index in gas, molten and solid phases and the corresponding temperature distributions was recorded via a high-speed camera. Response delay time was carefully analyzed to discuss the potential role of the liquid phase on the burning character.