Nozzle Hole Film Formation and its Link to Spray Characteristics in Swirl-Pressure Atomizers for Direct Injection Gasoline Engines

2002 ◽  
Author(s):  
M. Gavaises ◽  
E. Abo-Serie ◽  
C. Arcoumanis
Keyword(s):  
Film Formation ◽  
Direct Injection ◽  
Spray Characteristics ◽  
Gasoline Engines ◽  
Nozzle Hole

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

Numerical Simulation on Effect of Nozzle-Hole Layout on Spray Characteristics and Combustion in a DI Diesel Engine

2012 ◽  
Vol 476-478 ◽  
pp. 448-452
Author(s):  
Jun Zhang ◽  
Chang Pu Zhao ◽  
Nai Zhuan Chen ◽  
Da Lu Dong ◽  
Bo Zhong
Keyword(s):  
Numerical Simulation ◽  
Diesel Engine ◽  
Direct Injection ◽  
Combustion Process ◽  
Three Dimensional ◽  
Three Dimensional Model ◽  
Spray Characteristics ◽  
Fuel Atomization ◽  
Di Diesel Engine ◽  
Nozzle Hole

Diesel spray characteristics are closely related to the combustion of the engine where the spray tip penetration and the fuel atomization play a key role especially for direct injection (DI) diesel engine. With different nozzles, the fuel atomization and evaporation will be different thereby affecting the combustion and emission characteristics. A three-dimensional model is built based on the parameters of a DI diesel engine, and its validation is also validated. Three nozzle-hole layouts are designed in this research, including the conventional hole, multi-hole, and group-hole. The spray characteristics and combustion process are studied with three different nozzle-hole layouts by the way of numerical simulation. Further more, the effect of inter-hole spacing of group-hole nozzle on the evaporation rate and combustion process is researched here.

scholarly journals Effects of Injection Nozzle Geometry on Spray Characteristics for Direct Injection Diesel Engines

2017 ◽  
Author(s):  
Nobushige Tamaki ◽  
Takato Harada
Keyword(s):  
Direct Injection ◽  
Injection Pressure ◽  
Spray Angle ◽  
Nozzle Geometry ◽  
High Dispersion ◽  
White Background ◽  
Spray Characteristics ◽  
Photographic Images ◽  
Nozzle Hole ◽  
Nozzle Geometries

Sprayatomization of the multi-hole atomization enhancement nozzle, which was invented in previous studies, is explored. The aim is to improve and obtain excellent spray characteristics. The effects of different nozzle geometries and dimensions on spray characteristics are investigated, including chamfered and rounded nozzle hole inlets and a multi-hole atomization enhancement nozzles.  It is found that the multi-hole atomization enhancement nozzle with a rounded chamfered inlet is effective in achieving a high-dispersion spray, a large spray angle and small droplets. However, it should be noted that the spray is significantly atomized and a large number of small droplets as suspended as a mist. The photographic images of the spray are taken against a white background and the boundaries between the ejected spray and the background are indistinct.  Furthermore, the breakup length is short at 3 mm for a hole diameter of 0.3 mm, the spray angle is about 70° and the Sauter mean diameter decreasesdramatically to 15 μm at a low injection pressure of 10 MPa.DOI: http://dx.doi.org/10.4995/ILASS2017.2017.4981

SPRAY CHARACTERISTICS IN A DIRECT-INJECTION DIESEL ENGINE

1996 ◽  
Vol 6 (1) ◽  
pp. 95-109 ◽  
Author(s):  
H. C. Yang ◽  
Hong Sun Ryou ◽  
Y. T. Jeong ◽  
Young Ki Choi
Keyword(s):  
Diesel Engine ◽  
Direct Injection ◽  
Spray Characteristics ◽  
Direct Injection Diesel Engine
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