Flame Front Dynamics in Flow of Hydrogen-Air Mixture in a Channel with Sudden Expansion and Polyurethane Foam

IF 2 3区 工程技术 Q3 MECHANICS
Sergey Golovastov, Grigory Bivol, Fyodor Kuleshov, Artem Elyanov, Victor Golub
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Abstract

This paper presents experimental investigations of the polyurethane foam influence on the combustion dynamics of hydrogen-air flames propagating in a channel with a sudden change in cross-section (i.e. expansion). The channel is open at both ends. Porous media of various lengths and pore size are considered. The porous inserts are placed downstream of the sudden expansion, inside the diagnostic section of dimensions 20 × 40 mm. A Schlieren visualization technique is used to monitor flame shape and propagation dynamics. Various equivalence ratios ranging from 0.3 to 1.0 are tested. The results show that depending on the equivalence ratio, porous length and pore size, the mixture can either propagate throughout the foam or be quenched. In propagating regime, it is found that the output velocity just behind the foam increases linearly with porous matrix length, indicating that the tortuous flow within the foam plays a significant role in the propagation of the flame. These results could be used both to increase the efficiency of gaseous combustion and to ensure the explosion safety of the gas equipment.

Abstract Image

Abstract Image

氢气-空气混合物在带有骤然膨胀和聚氨酯泡沫的通道中流动时的火焰前沿动力学
本文介绍了聚氨酯泡沫对在横截面突然变化(即膨胀)的通道中传播的氢气-空气火焰燃烧动力学影响的实验研究。通道两端是开放的。考虑了不同长度和孔径的多孔介质。多孔插入物放置在突然膨胀的下游,尺寸为 20 × 40 毫米的诊断截面内。使用 Schlieren 可视化技术监测火焰形状和传播动态。测试了从 0.3 到 1.0 的各种等效比。结果表明,根据等效比、多孔长度和孔径的不同,混合物既可以在整个泡沫中传播,也可以被熄灭。在传播过程中,发现泡沫后面的输出速度随着多孔基质长度的增加而线性增加,这表明泡沫内部的迂回流动在火焰传播过程中起着重要作用。这些结果既可用于提高气体燃烧的效率,也可用于确保燃气设备的爆炸安全。
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来源期刊
Flow, Turbulence and Combustion
Flow, Turbulence and Combustion 工程技术-力学
CiteScore
5.70
自引率
8.30%
发文量
72
审稿时长
2 months
期刊介绍: Flow, Turbulence and Combustion provides a global forum for the publication of original and innovative research results that contribute to the solution of fundamental and applied problems encountered in single-phase, multi-phase and reacting flows, in both idealized and real systems. The scope of coverage encompasses topics in fluid dynamics, scalar transport, multi-physics interactions and flow control. From time to time the journal publishes Special or Theme Issues featuring invited articles. Contributions may report research that falls within the broad spectrum of analytical, computational and experimental methods. This includes research conducted in academia, industry and a variety of environmental and geophysical sectors. Turbulence, transition and associated phenomena are expected to play a significant role in the majority of studies reported, although non-turbulent flows, typical of those in micro-devices, would be regarded as falling within the scope covered. The emphasis is on originality, timeliness, quality and thematic fit, as exemplified by the title of the journal and the qualifications described above. Relevance to real-world problems and industrial applications are regarded as strengths.
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