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首页> 外文期刊>International Journal of Heat and Mass Transfer >Multicomponent drop breakup during impact with heated walls
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Multicomponent drop breakup during impact with heated walls

机译：热墙冲击过程中的多组分滴

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Understanding multicomponent drop breakup during impact with walls is critical to the prediction and optimization of fuel-air mixture distribution in combustion systems. In combustors, drops impact walls over a range of wall temperatures and drop velocities, resulting in complex outcomes. In this paper, the regimes of drop impact are characterized for bicomponent and multicomponent fuel drops impacting hot walls. Mixtures of n-heptane and n-decane were used to represent low and high boiling point fuel components, respectively. The wall surface temperatures were varied from 27 to 400 degrees C with drop Weber numbers ranging up to similar to 700 for a range of mixing ratios of n-heptane and n-decane. The drop impact events were recorded using high-speed imaging, allowing the identification of impact outcomes and classification into regimes of film deposition, nucleate boiling, and rebound at low Weber numbers, and splashing and breakup at high Weber numbers. In bicomponent mixtures of n-heptane and n-decane, increasing the fraction of the volatile component (n-heptane) results in secondary film breakup at low wall temperatures and a shift in the classified regimes of impact. The droplet size distribution following this secondary breakup was determined, and results show a decrease in the mean droplet size with increasing volatile concentration. Finally, commercial gasoline and diesel fuel drops were examined over similar wall temperature and Weber number ranges. The impact regimes are comparable to those identified for the well-defined bicomponent liquid mixture, in which more volatile components promote rebound and disintegration of the liquid. (C) 2019 Elsevier Ltd. All rights reserved.
机译：了解与墙壁的冲击期间的多组分滴分段对燃烧系统中的燃料 - 空气混合物分布的预测和优化是至关重要的。在燃烧器中，在一系列壁温度和液滴速度下降撞击壁，从而产生复杂的结果。在本文中，对撞击热壁的双组分和多组分燃料下降的表征液滴的制度。使用N-庚烷和N-癸烷的混合物分别代表低沸点燃料组分。壁表面温度从27〜400摄氏度变化，下降韦伯数量范围为类似于N-庚烷和N-癸烷的混合比的700。使用高速成像记录下降冲击事件，允许在低韦伯数量的薄膜沉积，核心沸腾和反弹中识别冲击结果和分类，并在高韦伯号中溅起和分析。在正庚烷和N-癸烷的双组分混合物中，增加挥发性组分（正庚烷）的级分导致次级薄膜分解在低壁温度下，并在分类的撞击方案中的转变。确定了该二次分解后的液滴尺寸分布，结果显示出平均液滴尺寸随着挥发性浓度的增加而降低。最后，在类似的壁温和韦伯数范围内检查商业汽油和柴油燃料滴。冲击制度与鉴定的液体混合物鉴定的那些相当，其中更挥发性组分促进液体的回弹和崩解。 （c）2019 Elsevier Ltd.保留所有权利。

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