Micro-explosion and autoignition of composite fuel/water droplets

Micro-explosion and autoignition of composite fuel/water droplets
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复合燃料/水滴的微爆炸和自燃

DOI:
10.1016/j.combustflame.2019.09.004
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发表时间:
2019
影响因子:
4.4
通讯作者:
Antonov D
Antonov D
中科院分区:
工程技术2区
文献类型:
--
作者:
Antonov D

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本文介绍了在高温空气中自由下落的复合燃料/水滴的膨化、微爆炸和自燃的实验研究结果。对非混合和预混合的柴油燃料/水和菜籽油/水滴进行测量。空气温度在850-1100 °C的范围内,初始液滴半径在0.62-1.34 mm的范围内,燃料(柴油或菜籽油)的相对体积分数在3- 97%的范围内。结果表明,微爆时间随温度的升高而减小,对燃料体积分数的依赖性较弱,随液滴尺寸的增大而增大。后一种趋势被证明是一致的,与先前开发的简单模型的预测液滴膨化/微爆炸的基础上的假设,即水的成分形成一个球形的子液滴位于中心的燃料液滴。结果表明,复合液滴的自燃延迟时间,接近微爆炸的时间为两种燃料考虑中,几乎是一个数量级小于纯燃料液滴。
The results of experimental investigations of puffing, micro-explosions and autoignition of composite fuel/water droplets free falling in a high temperature air are presented. The measurements were performed for non-mixed and premixed Diesel fuel/water and rapeseed oil/water droplets. Air temperature was in the range 850–1100 °C, initial droplet radii were in the range 0.62–1.34 mm, and relative volume fractions of fuel (Diesel fuel or rapeseed oil) were in the range 3–97%. It is shown that the time to micro-explosion decreases with increasing temperature, weakly depends on the volume fraction of fuel, and increases with increasing droplet sizes. The latter trend is shown to be consistent with the prediction of the previously developed simple model for droplet puffing/micro-explosion based on the assumption that the water component forms a spherical sub-droplet located in the centre of a fuel droplet. It is shown that the autoignition delay time for composite droplets, close to the time to micro-explosion for both fuels under consideration, is almost an order of magnitude less than that for pure fuel droplets.
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