Cool diffusion flames in a stably stratified stagnation flow
Cool diffusion flames in a stably stratified stagnation flow
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DOI：
10.1016/j.combustflame.2023.112852
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发表时间：
2023-08
影响因子：
4.4
通讯作者：
Kendyl A. Waddell;Han-Ju Lee;V. Nayagam;R. Axelbaum;P. Sunderland
中科院分区：
文献类型：
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作者：
Kendyl A. Waddell;Han-Ju Lee;V. Nayagam;R. Axelbaum;P. Sunderland
冷扩散火焰自2012年被发现以来一直是一个不断增长的研究课题。到目前为止，他们的研究一直受到用于观察他们的实验系统的高成本的阻碍。本文介绍了一种利用正庚烷液池和加热平板以产生稳定分层滞止流的方法来廉价地观测冷扩散火焰。用彩色照相机和增强照相机对火焰进行成像。测量包括气相温度、燃料蒸发速率和甲醛产率。这是第一次观察到在燃料池表面附近燃烧的冷火焰。测得的峰值温度在705和760 K之间，比周围空气的温度高70 K。在550K时首次发生自燃。
Cool diffusion flames have been a growing research topic since their discovery in 2012. Until now their study has been hindered by the high cost of the experimental systems used to observe them. A method is presented here for observing cool diffusion flames inexpensively using a pool of liquidn-heptane and parallel plates heated so as to produce a stably stratified stagnation flow. The flames were imaged with a color camera and an intensified camera. Measurements included gas phase temperatures, fuel evaporation rates, and formaldehyde yields. These are the first observations of cool flames burning near the surfaces of fuel pools. The measured peak temperatures were between 705 and 760 K and were 70 K above the temperature of the surrounding air. Autoignition first occurred at 550 K.