背景气密度对GDI喷雾特性的影响*

doi:10.19562/j.chinasae.qcgc.2020.06.004

汽车工程 ›› 2020, Vol. 42 ›› Issue (6): 734-740.doi: 10.19562/j.chinasae.qcgc.2020.06.004

背景气密度对GDI喷雾特性的影响^*

李钦伟^1,2, 侯志刚¹, 张景宇², 李雁飞², 帅石金²

1.烟台大学机电汽车工程学院,烟台 264005;
2.清华大学,汽车安全与节能国家重点实验室,北京 100084

收稿日期:2019-08-27 出版日期:2020-06-25 发布日期:2020-07-16
通讯作者: 李雁飞,助理研究员,博士,E-mail:liyf2018@tsinghua.edu.cn
基金资助:
国家重点研发项目(2018YFB0106000)资助

Influence of Background Gas Density on GDI Spray Characteristics

Li Qinwei^1,2, Hou Zhigang¹, Zhang Jingyu², Li Yanfei², Shuai Shijin²

1. School of Electromechanical and Automotive Engineering, Yantai University, Yantai 264005;
2. Tsinghua University, State Key Laboratory of Automotive Safety and Energy, Beijing 100084

Received:2019-08-27 Online:2020-06-25 Published:2020-07-16

摘要/Abstract

摘要： 在一定容燃烧弹中,采用3种不同的背景气体(He、N₂、CO₂),通过高速摄影技术,研究了非闪沸条件下背景气密度和燃油温度对某5孔GDI喷油器喷雾特性的影响。结果表明:背景气密度是影响喷雾坍塌的关键因素。随着背景气密度的增加,坍塌程度呈现先增强后稳定的趋势,转折点位于4 kg·m^-3左右。当背景气密度低于4 kg·m^-3时,增大背景气密度,单个油束宽度的增加使得喷雾各个油束之间的间隙减小,阻碍外部气体进入内部平衡低压区,喷雾内外压差增大,导致坍塌程度增强;当背景气密度高于4 kg·m^-3时,喷雾各油束之间的间隙消失,喷雾内外的气体交换被阻断,喷雾内外压差趋于稳定,导致坍塌程度趋于稳定。燃油温度的改变对喷雾宽度的影响较小。

关键词: GDI喷雾, 非闪沸, 背景气密度, 喷雾特性

Abstract: In a constant volume combustion bomb, three different background gases (He, N₂, CO₂) are used to study the influence of background gas density and fuel temperature on the spray characteristics of a five-hole gasoline direct injection (GDI) injector under non-flash-boiling conditions by high-speed photography. The results show that background gas density is the key factor affecting spray collapse. With the increase of background gas density, the spray collapse shows a trend of strengthening first and then stabilizing, with the turning point around 4 kg·m^-3. When the background gas density is lower than 4 kg·m^-3, the spray plumes would become wider and resultantly the gap between jets becomes narrower with the increase of background gas density, further preventing the external gas from entering the enclosed low-pressure zone. The internal and external pressure difference of spray increases, resulting in the increase of spray collapse degree. When the background gas density is higher than 4 kg·m^-3, the gap between jets disappears, and the spray external and internal gas exchange is blocked. The internal and external pressure difference of spray tends to be stable, which leads to the stability of spray collapse. The change of fuel temperature has little effect on spray width

Key words: GDI spray, non-flash-boiling, background gas density, spray characteristics

李钦伟, 侯志刚, 张景宇, 李雁飞, 帅石金. 背景气密度对GDI喷雾特性的影响^*[J]. 汽车工程, 2020, 42(6): 734-740.

Li Qinwei, Hou Zhigang, Zhang Jingyu, Li Yanfei, Shuai Shijin. Influence of Background Gas Density on GDI Spray Characteristics[J]. Automotive Engineering, 2020, 42(6): 734-740.

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背景气密度对GDI喷雾特性的影响^*

Influence of Background Gas Density on GDI Spray Characteristics

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