The Effect of Fuel-Line Pressure Perturbation on the Spray Atomization Characteristics of Automotive Port Fuel Injectors

1995 ◽  
Author(s):  
Fu-Quan Zhao ◽  
Amer Ahmad Amer ◽  
Ming-Chia Lai ◽  
John L. Dressler
Keyword(s):  
Spray Atomization ◽  
Pressure Perturbation ◽  
Fuel Injectors ◽  
Line Pressure ◽  
Atomization Characteristics

The Spray Structure of Air-Shrouded Dual-Stream Port Fuel Injectors With Different Air-Mixing Mechanisms

1998 ◽  
Vol 120 (1) ◽  
pp. 217-224
Author(s):  
F.-Q. Zhao ◽  
J.-H. Yoo ◽  
M.-C. Lai
Keyword(s):  
Mie Scattering ◽  
Spray Atomization ◽  
Spray Parameters ◽  
Radial Velocity Component ◽  
Fuel Injectors ◽  
Gasoline Engines ◽  
Spray Structure ◽  
Planar Laser ◽  
Air Mixing ◽  
Atomization Characteristics

An experimental study of the spray structure from air-shrouded dual-stream injectors with different air mixing mechanisms was carried out extensively to understand the spray characteristics of dual-stream port injectors for applications to four-valve gasoline engines. The injectors were tested under both steady and transient conditions at different injection pressures and air shrouding pressure differentials. The global spray structure was visualized using the planar laser Mie scattering technique and spray atomization processes were characterized by the phase-Doppler anemometry method. The experimental results showed that spray atomization characteristics are improved markedly by the air-shrouding technique and also strongly dominated by the air-mixing mechanisms. When the air flows into the injector tip mainly from the radial direction, two streams of the spray are forced to merge together and as a result a single-stream spray is formed. When the radial velocity component of the air is reduced and the air is made to mix well with the fuel inside the injector tip, however, the two streams of the spray are well separated over different injection conditions. Moreover, other spray parameters are also modified by the air shrouded into the injector, which must be optimized in order to achieve the best performance of the air-shrouded injector.

SPRAY ATOMIZATION CHARACTERISTICS OF A LOW PRESSURE ROTARY INJECTOR

2019 ◽  
Vol 29 (6) ◽  
pp. 493-519
Author(s):  
Kushal Ghate ◽  
Shraddha Sharma ◽  
Thirumalachari Sundararajan
Keyword(s):  
Low Pressure ◽  
Spray Atomization ◽  
Atomization Characteristics

scholarly journals Effect of intensified cavitation using poly(vinyl alcohol) microbubbles on spray atomization characteristics in microscale

AIP Advances ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 025318 ◽  
Author(s):  
Taher Abbasiasl ◽  
Soroush Niazi ◽  
Araz Sheibani Aghdam ◽  
Hongjian Chen ◽  
Fevzi Çakmak Cebeci ◽  
...  
Keyword(s):  
Vinyl Alcohol ◽  
Poly Vinyl Alcohol ◽  
Spray Atomization ◽  
Atomization Characteristics

Effect of Air Movement to Spray Development of Rapeseed Oil in Diesel Engine

2014 ◽  
Vol 554 ◽  
pp. 479-483
Author(s):  
Azwan Sapit ◽  
Mohd Azahari ◽  
Mas Fawzi ◽  
Amir Khalid ◽  
Bukhari Manshoor
Keyword(s):  
Rapeseed Oil ◽  
High Speed ◽  
High Viscosity ◽  
Spray Atomization ◽  
Main Body ◽  
Mixing Process ◽  
Important Process ◽  
Air Movement ◽  
Air Mixing ◽  
Atomization Characteristics

Fuel-air mixing is important process in diesel combustion. Generally there a two air mixing strategy, which is slow fuel – fast air mixing and fast fuel – slow air mixing. Air movement inside the combustion chamber greatly affect the mixing process and made effective fuel air mixing possible. Biomass fuel needs great help of mixing to atomization because the fuel has high viscosity and high distillation temperature. This study investigates the effect of air movement to spray development and atomization characteristics of rapeseed oil (RO). Optical observation of RO spray was carried out using shadowgraph photography technique and also using high speed camera. The results show that fast air movement effectively promotes RO spray atomization, with the RO spray expand outward from the main body through the whole spray length, which suggests fuel dispersion due to fast air movement.

Effect of Wall Configuration on Atomization of Rapeseed Oil Diesel Spray Impinging on the Wall

2013 ◽  
Vol 315 ◽  
pp. 320-324 ◽  
Author(s):  
Azwan Sapit ◽  
Takashi Yano ◽  
Yoshiyuki Kidoguchi ◽  
Yuzuru Nada
Keyword(s):  
Rapeseed Oil ◽  
High Viscosity ◽  
Boundary Region ◽  
Spray Atomization ◽  
Important Process ◽  
Optical Images ◽  
Atomization Spray ◽  
Wall Impingement ◽  
Air Mixing ◽  
Atomization Characteristics

Fuel-air mixing is important process in diesel combustion. It has been well known that wall configuration of the piston affects spray atomization. Biomass fuel, that is viable alternative fuel for fossil one, needs great help of mixing to atomization because the fuel has high viscosity and high distillation temperature. This study investigates spray atomization characteristics of rapeseed oil (RO) when it impinges on the piston wall. Optical observation of RO spray was carried out using shadowgraph photography technique. The optical images and image analysis show that wall impingement effectively promotes RO spray atomization. Spray atomization is more sensitive to wall configuration for RO than diesel fuel. The wall that has flat floor at the bottom can improve atomization. It is necessary for RO spray to promote spray penetration followed by wall-impingement because long spray path offers wide spray boundary region to form droplets.

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