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首页> 外文期刊>Combustion Science and Technology >Flame Propagation in Swirling Flows—Effect of Local Extinction on the Combustion Induced Vortex Breakdown
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Flame Propagation in Swirling Flows—Effect of Local Extinction on the Combustion Induced Vortex Breakdown

机译：火焰在旋流中的传播-局部消光对燃烧诱导涡旋破坏的影响

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摘要

The interaction of chemical reaction and swirling flows can lead to accelerated flame propagation. In this context, the combustion induced vortex breakdown (CIVB) has been identified in previous studies as prevailing flashback mechanism in swirl burners. However, quenching of the chemical reaction can prevent the upstream flame propagation due to a CIVB. The present study shows that this limiting criterion can be described by a quenching constant that is balancing the chemical time scale with a time scale for the flow. The most appropriate chemical time scales are based on perfectly stirred reactor (PSR) simulations. To consider the influence of the preferential diffusion typical for hydrogen, the PSR time scales are corrected by the Lewis number. Once the quenching constant is determined experimentally for a specific burner configuration, the flashback limits for various operating conditions and fuels can be predicted. Finally, the pressure scaling of the flashback limits is discussed.
机译：化学反应和旋流的相互作用可导致火焰加速传播。在这种情况下，在先前的研究中已经将燃烧诱发的涡旋破坏（CIVB）确定为旋流燃烧器中的主要逆燃机理。但是，化学反应的淬灭可以防止由于CIVB引起​​的上游火焰传播。本研究表明，该限制标准可以用一个淬灭常数来描述，该常数在化学时间尺度和流动时间尺度之间取得平衡。最合适的化学时间标度基于完全搅拌反应器（PSR）模拟。为了考虑典型的氢优先扩散的影响，PSR时标由路易斯数校正。一旦通过实验确定了特定燃烧器配置的淬火常数，就可以预测各种运行条件和燃料的回火极限。最后，讨论了闪回极限的压力定标。

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