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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Nitrogen oxides emissions from buoyancy and momentum controlled turbulent methane jet diffusion flames
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Nitrogen oxides emissions from buoyancy and momentum controlled turbulent methane jet diffusion flames

机译：浮力和动量控制的湍流甲烷射流扩散火焰产生的氮氧化物排放

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This paper presents an investigation on unconfined, vertical, turbulent methane jet diffusion flames issuing from a straight tube into quiescent air at atmospheric pressure and temperature, and is focused on NOx emissions. In addition to post-flame NOx emissions, measurements were made for flame geometry (lift-off heights and flame heights) and flame radiant fractions as a means of explaining the observed NOx emission scaling for both buoyancy and momentum dominated turbulent methane jet diffusion flames. The test conditions analyzed covered a wide range of flow conditions varied by changing the nozzle exit internal diameter and the jet exit mean velocity. Three different sized nozzles with inner diameters of 5, 6 and 8 mm were employed and the ranges of jet exit velocities, Reynolds and Froude numbers considered were 9.4-89.9 m/s, 4181-44,547 and 1117-102,738, respectively. The main conclusions of the present study are: (1) the experimental results show that the transition from buoyancy to momentum controlled turbulent jet diffusion flames occurs at a Fronde number of about 10(4); (2) in common with previous studies, the results show that for buoyancy dominated flames the main factor that controls the NOx scaling is the flame volume (proportional to Fr-3/5); and (3) in the momentum dominated regime, the EINOx data yield a Froude number dependence of Fr-0.35; in this regime, all flames present constant flame heights and radiant fractions so that departure from the zeroth-order scaling is attributed to chemical non-similarity. (C) 2004 Elsevier Inc. All rights reserved.
机译：本文对在大气压力和温度下从直管向静止空气中散发的无限制，垂直，湍流的甲烷射流扩散火焰进行了研究，重点是NOx排放。除了火焰后的NOx排放外，还对火焰的几何形状（上升高度和火焰高度）和火焰辐射分数进行了测量，以解释在浮力和动量主导的湍流甲烷射流扩散火焰中观察到的NOx排放标度。通过改变喷嘴出口内径和射流出口平均速度，分析的测试条件涵盖了广泛的流动条件。使用了三种内径分别为5、6和8 mm的喷嘴，射流出口速度，雷诺数和弗洛德数的范围分别为9.4-89.9 m / s，4181-44,547和1117-102,738。本研究的主要结论是：（1）实验结果表明，从浮力到动量控制的湍流射流扩散火焰的转变发生在Fronde数约为10（4）的地方; （2）与以前的研究相同，结果表明，对于浮力为主的火焰，控制NOx结垢的主要因素是火焰体积（与Fr-3 / 5成比例）; （3）在动量控制下，EINOx数据的Froude数依赖性为Fr-0.35;在这种情况下，所有火焰都呈现出恒定的火焰高度和辐射分数，因此偏离零级标度的原因是化学上的不相似性。 （C）2004 Elsevier Inc.保留所有权利。

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