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Experimental investigations on the flame structure and temperature field of landfill gas in impinging slot burners

机译：撞击式槽燃烧器中垃圾填埋气的火焰结构和温度场的实验研究

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In the present study, structure and temperature field of flame in inclined opposite laminar premixed jets of landfill gas are investigated. Impinging of flame jets at different angles and jet-to-jet spacing pose new challenges for investigation of double-burners. The effects of key parameters such as Reynolds number (70-150), equivalence ratio (0.8-2.5), burners' intersecting angle (60 degrees-100 degrees), and jet-to-jet spacing (5/D-h = 3.84-9.6) were investigated by the Mach-Zehnder interferometry technique. The temperatures acquired from the 2D interferograms were compared with the thermocouple readings and the numerical simulation outcomes. The results clarified that by doubling the Reynolds number and reducing the angle between the two slot burners by 40 degrees, the difference between maximum temperatures is 4% and 3%, respectively. These variations have a limited influence on the maximum flame temperature, but the flame configuration differs significantly, while the equivalence ratio has a notable effect on both the structure and temperature of the flame. The maximum flame temperature varied 27% by changing the equivalence ratio from 2.5 to 1. Also, the configuration and temperature of the flame and the hot zone's location are strongly affected by the distance between burners. Numerical simulations indicated that the NOx emissions are directly correlated with the maximum flame temperature. (C) 2018 Elsevier Ltd. All rights reserved.
机译：在本研究中，研究了倾斜的相对的层状预混垃圾气体的火焰结构和温度场。火焰喷射器以不同角度和喷射器与喷射器之间的间距撞击对双燃烧器的研究提出了新的挑战。关键参数的影响，例如雷诺数（70-150），当量比（0.8-2.5），燃烧器的相交角（60度至100度）和喷射间距（5 / Dh = 3.84-9.6） ）通过Mach-Zehnder干涉测量技术进行了研究。从2D干涉图获得的温度与热电偶读数和数值模拟结果进行了比较。结果表明，通过将雷诺数加倍并将两个狭缝燃烧器之间的角度减小40度，最高温度之间的差分别为4％和3％。这些变化对最高火焰温度的影响有限，但是火焰构型差异很大，而当量比对火焰的结构和温度都有显着影响。通过将当量比从2.5更改为1，最高火焰温度会发生27％的变化。此外，火焰的结构和温度以及热区的位置会受到燃烧器之间距离的强烈影响。数值模拟表明，NOx排放与最高火焰温度直接相关。 （C）2018 Elsevier Ltd.保留所有权利。

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