Spray Characteristics and Wall-impingement Process with Different Piston Tops for the Multi-hole Injector of DISI Gasoline Engines

2011 ◽  
Author(s):  
Qianwang Fan ◽  
Liguang Li ◽  
Zongjie Hu ◽  
Jun Deng
Keyword(s):  
Spray Characteristics ◽  
Gasoline Engines ◽  
Wall Impingement ◽  
Impingement Process

Effect of ultra-high injection pressure up to 50 MPa on macroscopic spray characteristics of a multi-hole gasoline direct injection injector fueled with ethanol

2017 ◽  
Vol 232 (8) ◽  
pp. 1092-1104 ◽  
Author(s):  
Xiang Li ◽  
Yi-qiang Pei ◽  
Jing Qin ◽  
Dan Zhang ◽  
Kun Wang ◽  
...  
Keyword(s):  
High Speed ◽  
Direct Injection ◽  
Cone Angle ◽  
Injection Pressure ◽  
Fuel Mixture ◽  
Gasoline Direct Injection ◽  
Spray Characteristics ◽  
High Injection ◽  
High Injection Pressure ◽  
Wall Impingement

This research systematically studied the effect of injection pressure on macroscopic spray characteristics of a five-hole gasoline direct injection (GDI) injector fueled with ethanol, especially under ultra-high injection pressure up to 50 MPa. The front and side views of sprays were photographed by the schlieren method using a high-speed camera. Various parameters, including spray development stages, cone angle, penetration, area and irregular ratio, were fully analyzed to evaluate macroscopic characteristics of the whole spray and spray core with varying injection pressure. The results demonstrated that the effect of ultra-high injection pressure on macroscopic spray characteristics was significant. As injection pressure increased from 10 MPa to 50 MPa, the occurrence time of branch-like structure decreased; the cone angle increased little; the area increased significantly; the area ratio dropped by 6.4 and 5.8 percentage points on average for the front view and side view spray, respectively. There was a significant increase in the trend for penetration as the injection pressure rose from 10 MPa to 30 MPa. However, this trend became weak when the injection pressure further increased. The penetration ratio under ultra-high injection pressure was slightly higher than it was under 10 or 20 MPa. Ultra-high injection pressure would not obviously raise the possibility of spray/wall impingement, but led to the impingement quantity increasing to some extent. Increasing injection pressure could enhance the vortex scale, finally resulting in better air/fuel mixing quality. Ultra-high injection pressure was a potential way to improve air/fuel mixture homogeneity for a GDI injector fueled with ethanol.

scholarly journals Spray Characteristics of a Multi-hole Injector for Direct-Injection Gasoline Engines

2006 ◽  
Vol 7 (3) ◽  
pp. 255-270 ◽  
Author(s):  
N Mitroglou ◽  
J M Nouri ◽  
M Gavaises ◽  
C Arcoumanis
Keyword(s):  
Direct Injection ◽  
Spray Characteristics ◽  
Gasoline Engines

scholarly journals Spray Characteristics of Slit Nozzle for DI Gasoline Engines.

2003 ◽  
Vol 46 (1) ◽  
pp. 10-16 ◽  
Author(s):  
Kiyomi KAWAMURA ◽  
Akinori SAITO ◽  
Mutsumi KANDA ◽  
Toshimi KASHIWAGURA ◽  
Yasuhiro YAMAMOTO
Keyword(s):  
Spray Characteristics ◽  
Gasoline Engines

A study on the spray characteristics of a piezo pintle-type injector for DI gasoline engines

2013 ◽  
Vol 27 (7) ◽  
pp. 1981-1993 ◽  
Author(s):  
Quan Dong ◽  
Tsuneaki Ishima ◽  
Hisanobu Kawashima ◽  
Wu-qiang Long
Keyword(s):  
Spray Characteristics ◽  
Gasoline Engines
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