Z. Wang, P.B. Sunderland, R.L. Axelbaum. Double Blue Zones in Laminar Jet Diffusion Flames, Combustion and flame. 2020 211 253-259.
发布时间：2020-07-24
点击次数：
影响因子：4.57
DOI码：10.1016/j.combustflame.2019.09.014
发表刊物：Combustion and flame
关键字：Chemiluminescence; Deconvolution; Spectroscopy; Triple flames
摘要：Past experimental and computational works indicate that double blue zones are possible in hydrocarbon diffusion flames. This study examines these zones in inverse (IDF) and normal (NDF) laminar gas jet diffusion flames. Over 100 diffusion flames were observed with various fuels, diluents, dilution levels, and flow rates. Upon close examination, the IDFs and NDFs are seen to have double blue zones, separated at the flame tip by up to 1.6 and 0.9mm, respectively, with a relatively dark region in between. By partially premixing the fuel and oxidizer streams, it was observed that, for both IDFs and NDFs, the zone toward the fuel side is rich, while that toward the oxidizer side is stoichiometric. Chemiluminescence was investigated using cameras and bandpass filters emphasizing emissions from OH* (310nm), CH* (430nm), CO2* (455nm), and C-2* (515 nm). The images were deconvolved using onion peeling. Broadband CO2* emissions were subtracted from the images of OH*, CH*, and C-2* emissions to find profiles of spectral emissive power for these species. The thin, blue-green zone on the fuel side coincides with the peaks in CH* and C-2* emissions in the fuel-consumption zone, while the broader, blue stoichiometric zone coincides with the peaks in OH* and CO2* emissions in the oxygen-consumption zone. The spectral emissive power peaks for C-2*, CO2*, CH*, and OH* are typically 3 times as high in the IDF as in the NDF, which is attributed to the higher scalar dissipation rates. (C) 2019 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
论文类型：期刊论文
卷号：21
页面范围：253-259
ISSN号：0010-2180
是否译文：否
发表时间：2020-01-01
收录刊物：SCI
发布期刊链接：https://www.sciencedirect.com/science/article/pii/S0010218019304286?via%3Dihub
附件：
2020-Double blue zones in inverse and normal laminar jet diffusion flames.pdf
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下一条： Z. Wang, P.B. Sunderland, R.L. Axelbaum. Dilution Effects on Laminar Jet Diffusion Flame Lengths. Proceedings of the Combustion Institute. 2019 37 1547-1553.