Numerical simulation of impinging spray characteristics under high ambient pressures with an improved droplet collision model
Numerical simulation of impinging spray characteristics under high ambient pressures with an improved droplet collision model
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采用改进的液滴碰撞模型对高环境压力下撞击喷雾特性进行数值模拟
DOI：
10.1016/j.fuel.2019.04.042
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发表时间：
2019-09
期刊：
影响因子：
7.4
通讯作者：
Lv Weilong
中科院分区：
文献类型：
--
作者：
Lu Yi;Zhao Changlu;Zhang Zhenyu;Zuo Zhe;Lv Weilong
对高压（10-60 atm）下的撞击喷雾特性进行了实验和数值模拟研究。最近提出的压力依赖的液滴碰撞模型被用来确定碰撞结果。将结果与Estrade等人和O 'Rourke的液滴碰撞模型的预测进行比较。结果表明，本文提出的压力相关模型能较好地解释Estrade等人和O 'Rourke的液滴碰撞模型中所没有的环境压力增加会促进液滴反弹的实验观察和理论。此外，Estrade等人和O 'Rourke的模型在高环境压力下往往会过度预测液滴尺寸，导致喷雾形状中出现多个尖端，而这在本模型的实验阴影图和预测中很少见到。此外，本模型的预测也解释了先前的实验，环境压力的增加抑制液滴破碎。进一步研究了不同环境压力下撞击喷雾液滴的速度特性。结果表明，环境压力的增加对液滴产生了较大的气动阻力，同时液滴的弹跳动能耗散导致了液滴速度的降低，且液滴速度在长时间内趋于“收敛”。
Impinging spray characteristics under high ambient pressures (10–60 atm) were investigated experimentally and numerically. A recently proposed pressure-dependent droplet collision model was adopted to determine the collision outcomes. The results being compared to the predictions of Estrade et al. and O’Rourke’s droplet collision models. The comparison shows that the present pressure-dependent model accounts for the previous experimental observation and theory that increasing of ambient pressure promotes droplet bouncing, which was absent in the predictions of Estrade et al. and O’Rourke’s droplet collision model. Moreover, Estrade et al. and O’Rourke’s model tend to over-predict droplet size under high ambient pressures, results in the multi-tips in the spray shape, which however was seldom seen in the experimental shadowgraphs and predictions of the present model. Additionally, predictions of present model also account for the previous experiment that increasing of ambient pressure suppresses droplet breakup. Droplet velocity characteristics of impinging sprays under different ambient pressures were further investigated. The results show that, increasing of ambient pressure plays more aerodynamic resistance on the droplet together with the droplet bouncing-induced kinetic energy dissipation result in the reduced droplet velocity, and long-time droplet velocities tend to “converge”.
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影响因子：
4.6
作者：
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通讯作者：
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作者：
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DOI：
10.4271/2003-01-1041
发表时间：
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期刊：
SAE transactions
影响因子：
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作者：
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