Experimental investigation of spray characteristics of multi-hole and slot gdi injectors at various fuel temperatures using closely spaced split-injection strategies

被引：0

作者：

Wu S. ^{[1
,2
]}

Meinhart M. ^{[2
]}

Yi J. ^{[2
]}

机构：

[1] Department of Mechanical Engineering, University of Michigan, Ann Arbor, 48109, MI

[2] Powertrain Research and Advanced Engineering, Ford Motor Company, Dearborn, 48124, MI

来源：

Atomization and Sprays | 2019年 / 29卷 / 12期

关键词：

Flash boiling spray; GDI multi-hole injector; GDI slot injector; Global spray structure; Overpenetration; Split injection;

D O I：

10.1615/ATOMIZSPR.2020033439

中图分类号：

学科分类号：

摘要：

In this study, multi-hole and slot gasoline direct-injection (GDI) injectors were investigated at various fuel temperatures by using various closely spaced split-injection strategies. The four tested injectors were a six-hole injector, a four-slot injector, a three-slot injector, and a one-slot injector. N-heptane was chosen as the test fuel, and fuel temperature ranged from 25°C to 130°C. Various closely coupled split-injection strategies were investigated, including single injection, double injection, triple injection, and quadruple injection. Results showed that fuel temperature had a negligible effect on global spray structure when fuel vapor pressure was lower than the ambient pressure, and spray structure was mainly dominated by injector configuration. Spray collapse occurred at strong superheated conditions of all injectors, which altered spray structure and, consequently, the fuel distribution. However, different trends of spray penetration caused by spray collapse were observed. Strong spray collapse led to increased spray penetration of the six-hole injector; but for the slot injectors, spray penetration was smaller than that at cold fuel temperature even when strong spray collapse occurred. By using quadruple-injection strategy, penetration of strong collapsed fuel spray was even shorter than that of fuel spray at 25°C fuel temperature of single injection of the six-hole injector. Finally, it can be concluded that by using special injector configuration or split-injection strategy, the overpenetrating issue caused by strong spray collapse at high fuel temperatures of multi-hole GDI injectors can be mitigated or avoided. © 2019 by Begell House.

引用

页码：1109 / 1131

页数：22

共 41 条

[1]

Aori G., Hung D., Zhang M., Zhang G., Li T., Effect of Nozzle Configuration on Macroscopic Spray Characteristics of Multi-Hole Fuel Injectors under Superheated Conditions, Atomization Sprays, 26, 5, pp. 439-462, (2016)

[2]

Chen H., Xu M., Hung D., Yang J., Zhuang H., Fuel Impingement Analysis of Flash-Boiling Spray in a Spark-Ignition Direct-Injection Engine, 16th ILASS-Asia, Proc. of the 16th Conf. of ILASS-Asia, (2013)

[3]

Guo H., Li Y., Lu X., Zhou Z., Xu H., Wang Z., Radial Expansion of Flash Boiling Jet and Its Relationship with Spray Collapse in Gasoline Direct Injection Engine, Appl. Therm. Eng, 146, pp. 515-525, (2019)

[4]

Huang Y., Huang S., Huang R., Hong G., Spray and Evaporation Characteristics of Ethanol and Gasoline Direct Injection in Non-Evaporating, Transition and Flash-Boiling Conditions, Energy Convers. Manage, 108, pp. 68-77, (2016)

[5]

Iyer C.O., Yi J., Spray Pattern Optimization for the Duratec 3.5 L EcoBoost Engine, SAE Int. J. Engines, 2, 1, pp. 1679-1689, (2009)

[6]

Jiang C., Parker M.C., Helie J., Spencer A., Garner C.P., Wigley G., Impact of Gasoline Direct Injection Fuel Injector Hole Geometry on Spray Characteristics under Flash Boiling and Ambient Conditions, Fuel, 1, 241, pp. 71-82, (2019)

[7]

Kale R., Banerjee R., Spray Collapse in a Multi-Hole GDI Injector and Its Effect on In-Cylinder Combustion, Two-Phase Flow for Automotive and Power Generation Sectors, pp. 43-61, (2019)

[8]

Karimi K., Characterisation of Multiple-Injection Diesel Sprays at Elevated Pressures and Temperatures, (2007)

[9]

Kazour J., Befrui B., Husted H., Raney M., Varble D., Innovative Sprays and Particulate Reduction with GDi Injectors, (2014)

[10]

Khan M.M., Helie J., Gorokhovski M., Sheikh N.A., Experimental and Numerical Study of Flash Boiling in Gasoline Direct Injection Sprays, Appl. Therm. Eng, 123, pp. 377-389, (2017)

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