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.

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.

scholarly journals Dynamic Behavior of Rapeseed Oil Spray in Diesel Engine

2015 ◽  
Vol 773-774 ◽  
pp. 520-524
Author(s):  
Azwan Sapit ◽  
Mohd Azahari Razali ◽  
Mohd Faisal Hushim ◽  
M. Jaat ◽  
Akmal Nizam Mohammad ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Dynamic Behavior ◽  
Rapeseed Oil ◽  
High Viscosity ◽  
Image Processing Algorithm ◽  
Spray Droplet ◽  
Droplet Behavior ◽  
Air Mixing ◽  
Atomization Characteristics ◽  
Entrainment Effect

Fuel-air mixing is important process in diesel combustion which significantly affects the combustion and emission of diesel engine. Due to the nature of biomass fuel that has high viscosity and high distillation temperature, the condition and furthermore the improvement of atomization process is very important. This study investigates the atomization characteristics and droplet dynamic behaviors of diesel engine spray fueled by rapeseed oil (RO). Optical observation of RO spray was carried out using shadowgraph photography technique. Single nanospark photography technique was used to study the characteristics of the rapeseed oil spray while dual nanospark shadowgraph technique was used to study the spray droplet behavior. Using in-house image processing algorithm, the images were processed and the boundary condition of RO spray also was studied. The results show that RO has very poor atomization due to the high viscosity nature of the fuel. This is in agreement with the results from spray droplet dynamic behavior studies that shows due to the high viscosity, the droplets are large in size and travel downward, with very little influence of entrainment effect due to its large kinematic energy.

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.

Effect of Preheated Fuel on Mixture Formation of Biodiesel Spray

2013 ◽  
Vol 393 ◽  
pp. 493-498 ◽  
Author(s):  
Amir Khalid ◽  
Christian Yohan M. Jaat ◽  
Izzuddin Zaman ◽  
B. Manshoor ◽  
M.F.M. Ali
Keyword(s):  
Vegetable Oil ◽  
Oxidation Stability ◽  
Fuel Properties ◽  
Fuel Composition ◽  
Spray Atomization ◽  
Mixture Formation ◽  
Spray Characteristics ◽  
Spray Penetration ◽  
Mixing Characteristics ◽  
Air Mixing

The key issue in using vegetable oil-based fuels is oxidation stability, stoichiometric point, bio-fuel composition, antioxidants on the degradation and viscosity thus influences to the different spray atomization and fuel air mixing characteristics. Purpose of this study is to investigate the effect of preheated biodiesel on fuel properties, spray characteristics and mixture formation. The detail behavior of mixture formation was investigated using the direct photography system with a digital color camera. This method can capture spray evaporation, spray length and mixture formation clearly with real images. Increased preheated fuel is found to enhance the spray penetration, resulting in increased the spray area and enhanced fuel-air premixing.

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

Combustion Analysis of Twisting-Blade Piston Diesel Engine Fuelled With Karanja Bio-Diesel

2013 ◽  
Author(s):  
Chandrashekarapur Ramachandraih Rajashekar ◽  
Tumkur Krishnamurthy Chandrasekhar ◽  
Tejendra Prasad ◽  
Chelur Rangalppa Kemparaju ◽  
Chebiyyam Uma Shankar
Keyword(s):  
Diesel Engine ◽  
Cone Angle ◽  
High Viscosity ◽  
Combustible Mixture ◽  
Emission Characteristics ◽  
Combustion Analysis ◽  
Piston Engine ◽  
Compression Stroke ◽  
Piston Crown ◽  
Atomization Characteristics

Bio-diesels have very poor atomization characteristics, due to decreased cone angle because of high viscosity and low volatility. Innovativeness is required to use the bio-diesel as efficient vehicular fuel. This paper presents the effect of piston geometry on combustion and emission characteristics of Karanja bio-diesel fuelled C.I.Engine. The piston crown has been modified into twisting blade combustion chamber. Three blades are made to twist through an angle of 60o in the piston crown at the end of compression stroke to induce turbulence to improve the combustibility of combustible mixture. In the present work the combustion and emission characteristics of twisting blade piston fuelled with Karanja bio-diesel have been studied and compared with standard piston engine.

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

scholarly journals Effect of Pressure Atomization with Wall Impingement on the Atomization Characteristics in a Jet Engine Burner

2004 ◽  
Vol 70 (700) ◽  
pp. 3257-3263
Author(s):  
Hideshi YAMADA ◽  
Yutaka MATSUMOTO ◽  
Shigeru HAYASHI ◽  
Seiichi SHIGA ◽  
Mikiya ARAKI ◽  
...  
Keyword(s):  
Jet Engine ◽  
Effect Of Pressure ◽  
Wall Impingement ◽  
Atomization Characteristics
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