scholarly journals Development of a Turbulent Liquid Spray Atomization Model for Diesel Engine Simulations

2021 ◽  
Author(s):  
Caroline Genzale ◽  
Keyword(s):  
Diesel Engine ◽  
Spray Atomization ◽  
Liquid Spray

Liquid Spray Data from an Optical Medium-Speed Diesel Engine and Its Comparison with CFD

2009 ◽  
Author(s):  
Ossi Kaario ◽  
Aki Tilli ◽  
Harri Hillamo ◽  
Teemu Sarjovaara ◽  
Ville Vuorinen ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Optical Medium ◽  
Medium Speed ◽  
Liquid Spray

Effect of the injection angle on liquid spray development in a high-speed direct-injection optical diesel engine

2009 ◽  
Vol 223 (8) ◽  
pp. 1077-1092 ◽  
Author(s):  
T-G Fang ◽  
R E Coverdill ◽  
C-F F Lee ◽  
R A White
Keyword(s):  
Diesel Engine ◽  
High Speed ◽  
Direct Injection ◽  
Mie Scattering ◽  
Injection Technique ◽  
Injection Timing ◽  
Injection Angle ◽  
Narrow Angle ◽  
Liquid Spray ◽  
Fuel Mixing

In this paper, the spray development and its interaction with the piston geometry were investigated in a small-bore high-speed direct-injection optical diesel engine. The effects of injection angle, injection timing, injection pressure, and injection fuel quantity were studied. The entire liquid spray cycle was visualized by a background-corrected Mie-scattering technique using a high-speed digital video camera synchronized with a high-repetition-rate copper vapour laser. For some conditions, the initial injection velocity was estimated quantitatively. The results show that the injection angle and injection timing predominantly control the spray interaction with the piston geometry and the resulting air—fuel mixing mode. Narrow-angle injection leads to a significantly different air—fuel mixing process from the traditional wide-angle injector. If properly controlled, the narrow-angle direct-injection technique offers more flexibility on injection timing control with the fuel confined in the central bowl region without wetting the cylinder liner.

NUMERICAL SIMULATION OF SPRAY ATOMIZATION IN SUPERSONIC FLOWS

2010 ◽  
Vol 24 (13) ◽  
pp. 1299-1302 ◽  
Author(s):  
JIANGFENG WANG ◽  
CHEN LIU ◽  
YIZHAO WU
Keyword(s):  
Numerical Simulation ◽  
Combustion Chamber ◽  
Liquid Fuel ◽  
Rapid Development ◽  
Droplet Size Distribution ◽  
Wave Structure ◽  
Spray Atomization ◽  
Propulsion Performance ◽  
Combustion Properties ◽  
Liquid Spray

With the rapid development of the air-breathing hypersonic vehicle design, an accurate description of the combustion properties becomes more and more important, where one of the key techniques is the procedure of the liquid fuel mixing, atomizing and burning coupled with the supersonic crossflow in the combustion chamber. The movement and distribution of the liquid fuel droplets in the combustion chamber will influence greatly the combustion properties, as well as the propulsion performance of the ramjet/scramjet engine. In this paper, numerical simulation methods on unstructured hybrid meshes were carried out for liquid spray atomization in supersonic crossflows. The Kelvin-Helmholtz/Rayleigh-Taylor hybrid model was used to simulate the breakup process of the liquid spray in a supersonic crossflow with Mach number 1.94. Various spray properties, including spray penetration height, droplet size distribution, were quantitatively compared with experimental results. In addition, numerical results of the complex shock wave structure induced by the presence of liquid spray were illustrated and discussed.

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