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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental and numerical study on the occurrence of off-stagnation peak in heat flux for laminar methane/air flame impinging on a flat surface
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Experimental and numerical study on the occurrence of off-stagnation peak in heat flux for laminar methane/air flame impinging on a flat surface

机译：层状甲烷/空气火焰撞击平面热流通量停滞峰发生的实验和数值研究

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摘要

A combined experimental and numerical study has been conducted to investigate the occurrence of off-stagnation peak for laminar methane/air flame impinging on a flat surface. Experiments were conducted for three tube burners of internal diameter 8 mm, 9.7 mm and 12 mm. Radial heat flux distributions were compared (experimentally) for different burner diameters under identical operating conditions (with firing rates of 0.25 kW, 0.40 kW and 0.50 kW, φ = 1 and H = 40 mm). An off-stagnation point peak in heat flux was observed for some of the configurations in the present study which is in accordance with the previous findings. This off-stagnation point peak is a function of stand-off distance between the exit plane of the burner and the plate and also the distance between flame-tip and the plate. A satisfactory explanation is presented to explain the existence of this off-stagnation peak with the help of results of numerical simulation carried out with commercial CFD code FLUENT. It is concluded that this off-stagnation peak in heat flux is primarily due to the peak in the axial velocity profile close to the impingement surface.
机译：已经进行了组合的实验和数值研究，以研究层流甲烷/空气火焰撞击平坦表面时的停滞峰。对内径分别为8 mm，9.7 mm和12 mm的三个管式燃烧器进行了实验。在相同的工作条件下（燃烧率分别为0.25 kW，0.40 kW和0.50 kW，φ= 1和H = 40 mm），比较（实验）了不同燃烧器直径的径向热通量分布。对于本研究中的某些配置，在热通量中出现了一个停滞点峰值，这与以前的发现是一致的。该停滞点峰值是燃烧器的出口平面与板之间的间隔距离以及火焰尖端与板之间的距离的函数。通过使用商用CFD代码FLUENT进行的数值模拟结果，给出了令人满意的解释来解释此停滞峰的存在。结论是，热通量的这种停滞峰主要是由于靠近撞击表面的轴向速度分布中的峰。

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