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Micro-explosion effects in a laminar water-in fuel spray diffusion flame
Combustion Theory and Modelling ( IF 1.3 ) Pub Date : 2020-11-23 , DOI: 10.1080/13647830.2020.1847329
J. Barry Greenberg 1 , Sahar Shpitz 1
Affiliation  

In this work, we formulate a simple one-dimensional model as a framework for studying the influence of water-in-fuel emulsions on spray diffusion flames. The special contribution of these emulsions to combustion is examined via the relevant steady state equations, which are solved both analytically, when the chemical Damköhler number becomes infinitely large, and numerically when it is finite. Two possible scenarios are investigated; the first, when no micro-explosions occur. The second is when conditions are met for droplet micro-explosions to happen, an occurrence that has been independently observed. The leading order analytical solutions indicate that, as far as the fuel vapour and temperature profiles are concerned, any differences between the case of occurrence and non-occurrence of micro-explosions is fairly minor. However, the numerical solutions showed that in both scenarios the range of permissible values of supply stream mass flux for which spray diffusion flames can be established is considerably reduced by the presence of the water in the droplets. This effect is magnified greatly when micro-explosions take place, primarily due to the focused heat loss for droplet evaporation which entails as the water vapour is released and the evaporation rate of the small droplets created by the micro-explosions is enhanced.



中文翻译:

层流含水燃料喷雾扩散火焰中的微爆炸效应

在这项工作中,我们制定了一个简单的一维模型作为研究燃料包水乳液对喷雾扩散火焰影响的框架。这些乳液对燃烧的特殊贡献是通过相关的稳态方程来检查的,当化学 Damköhler 数变得无限大时,这些方程通过解析求解,当它有限时通过数值求解。研究了两种可能的情况;第一,当没有发生微爆炸时。第二个是当满足液滴微爆炸发生的条件时,这种情况已被独立观察到。主阶解析解表明,就燃料蒸气和温度分布而言,微爆炸发生和不发生的情况之间的任何差异都相当小。然而,数值解表明,在这两种情况下,由于液滴中存在水,可以建立喷雾扩散火焰的供应流质量通量的允许值范围大大减少。当发生微爆炸时,这种影响会被大大放大,这主要是由于液滴蒸发的集中热量损失,随着水蒸气的释放,微爆炸产生的小液滴的蒸发率增加。

更新日期:2020-11-23
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