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Propagation of a hemispherical flame over a heat-absorbing surface
Proceedings of the Combustion Institute ( IF 3.4 ) Pub Date : 2018-09-07 , DOI: 10.1016/j.proci.2018.08.044
V. Golub , A. Korobov , A. Mikushkin , V. Petukhov , V. Volodin

This paper presents an experimental study of hydrogen–air flame front dynamics and propagation over a heat-absorbing surface. Experimental data on the hemispherical flame propagation in hydrogen–air mixture with hydrogen content of 15% in 4.5 m3 cylindrical volume were obtained at the ignition at the centre of the bottom with energy of 5 J. The flame propagates at atmospheric pressure over a solid aluminium wall or a layer of steel wool. The flame acceleration dynamics were compared at hemispherical and finger flame stages. It was found that in a mixture with a hydrogen content of 15% the flame over the layer of steel wool propagates 2.5 times more slowly than that over the surface of an aluminium wall. Calculation of heat absorption in the steel wool layer shows that the heat losses due to the absorption are the main phenomenon causing the suppression of Darrieus–Landau instability and flame front speed reduction, which was observed in the experiments. Experimental results are compared with analytical model of finger flame propagation from literature.



中文翻译:

半球形火焰在吸热表面上的传播

本文介绍了氢-空气火焰前沿动力学和在吸热表面上传播的实验研究。在4.5 m 3中氢含量为15%的氢-空气混合物中半球形火焰传播的实验数据在底部中央的点火处以5 J能量获得圆柱体积。火焰在大气压下在坚固的铝壁或一层钢丝棉上传播。比较了半球形和手指火焰阶段的火焰加速动力学。已发现,在氢含量为15%的混合物中,钢丝棉层上的火焰传播的速度比铝壁表面上火焰传播的速度慢2.5倍。计算得出的钢丝棉层的热吸收表明,吸收引起的热损失是导致抑制Darrieus-Landau不稳定和降低火焰前锋速度的主要现象,这一点已在实验中观察到。将实验结果与文献中手指火焰传播的分析模型进行了比较。

更新日期:2018-09-07
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