Effect of flash boiling on microscopic and macroscopic spray characteristics in optical GDI engine
Effect of flash boiling on microscopic and macroscopic spray characteristics in optical GDI engine
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闪蒸对光学 GDI 发动机微观和宏观喷雾特性的影响
DOI：
10.1016/j.fuel.2016.11.043
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发表时间：
2017-02
期刊：
影响因子：
7.4
通讯作者：
Wang Jianxin
中科院分区：
文献类型：
--
作者：
Guo Hengjie;Ma Xiao;Li Yanfei;Liang Shuai;Wang Zhi;Xu Hongming;Wang Jianxin
利用相位多普勒粒子分析仪(PDPA)和高速摄影技术对单缸光学汽油直喷(GDI)发动机的闪蒸喷雾进行了研究。首先，在大气条件下，仔细研究了可能影响PDPA气缸内测量可靠性的因素。随后，发动机在怠速和大开节气门(WOT)条件下进行了试验，燃油温度在20℃到90℃之间。结果表明，在怠速工况下，随着燃油温度的升高，喷雾向喷油器轴线方向塌陷。在较高的燃油温度下，喷雾渗透率增加，从而增加了燃油撞击壁面的概率。当燃料温度从20℃升高到60℃时，AMD和SMD分别下降了43.6%和33.2%，表明雾化质量有了显著的改善。同时，液滴的均匀性急剧下降。当温度进一步升高到90℃时，AMD和SMD仅略有下降，但液滴的均匀性变得更好。在WOT操作下，除了90℃的情况外，没有发现明显的喷雾变形迹象。AMD和SMD随着燃料温度的升高而稳步下降，这主要归因于粘度和表面张力的降低。此外，随着燃油温度的升高，液滴的均匀性逐渐增大。(C)2016爱思唯尔有限公司。保留所有权利。
The flash boiling sprays in a single-cylinder optical gasoline direct injection (GDI) engine were studied using phase Doppler particle analyzer (PDPA) and high-speed photography. Initially, the factors which may influence the in-cylinder measurement reliability of PDPA were carefully examined under atmospheric conditions. Afterwards, engine experiments were conducted under idle and wide open throttle (WOT) conditions with the fuel temperature ranging from 20 degrees C to 90 degrees C. The results show that under idle operation, the spray collapsed towards the injector axis as the fuel temperature increased. At high fuel temperatures, the spray penetration increased so that the probability of fuel-wall impingement rises. As the fuel temperature increased from 20 degrees C to 60 degrees C, the AMD and SMD slumped by 43.6% and 33.2%, indicating the dramatic improvement in atomization quality. Concurrently, the droplet uniformity decreased sharply. As the temperature further increased to 90 degrees C, the AMD and SMD only dropped slightly, but the droplet uniformity became better. Under WOT operation, no distinct evidence of spray deformation was found except for the case at 90 degrees C. The AMD and SMD dropped steadily with the increase in fuel temperature, which is mainly attributed to the reduction in viscosity and surface tension. Besides, the droplet uniformity increased gradually along with the fuel temperature. (C) 2016 Elsevier Ltd. All rights reserved.
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影响因子：
7.4
作者：
Aleiferis, P. G.;van Romunde, Z. R.
通讯作者：
van Romunde, Z. R.
影响因子：
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DOI：
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发表时间：
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期刊：
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通讯作者：
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影响因子：
2.7
作者：
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DOI：
10.1016/j.proci.2012.07.061
发表时间：
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期刊：
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