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.

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.

scholarly journals Comparision on dynamic behavior of diesel spray and rapeseed oil spray in diesel engine

2017 ◽  
Vol 822 ◽  
pp. 012058
Author(s):  
Azwan Sapit ◽  
Mohd Azahari Razali ◽  
Mohd Faisal Hushim ◽  
Norrizam Jaat ◽  
Akmal Nizam Mohammad ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Dynamic Behavior ◽  
Rapeseed Oil ◽  
Diesel Spray

scholarly journals Study on Spray Characteristics and Spray Droplets Dynamic Behavior of Diesel Engine Fueled by Rapeseed Oil

2014 ◽  
Vol 13 ◽  
pp. 02005
Author(s):  
Azwan Sapit ◽  
Mohd. Azahari Razali ◽  
Mohd Faisal Hushim ◽  
Mas Fawzi Mohd Ali ◽  
Amir Khalid ◽  
...  
Keyword(s):  
Diesel Engine ◽  
Dynamic Behavior ◽  
Rapeseed Oil ◽  
Spray Characteristics ◽  
Spray Droplets

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.

Investigations on Preheated Palm Oil Methyl Esters in the Diesel Engine

1996 ◽  
Vol 210 (2) ◽  
pp. 131-138 ◽  
Author(s):  
H Masjuki ◽  
M Z Abdulmuin ◽  
H S Sii
Keyword(s):  
Diesel Engine ◽  
Palm Oil ◽  
Methyl Esters ◽  
Engine Performance ◽  
Exhaust Emissions ◽  
High Viscosity ◽  
Major Drawback ◽  
Brake Power ◽  
Atomization Characteristics ◽  
Conventional Diesel Fuel

The major drawback of vegetable oil fuels is their high viscosity. Various conventional approaches to reducing the viscosity of vegetable oils are studied theoretically and experimentally. An attempt to reduce the viscosity of the palm oil methyl esters (POME) by preheating the fuel was performed and a comparison on the basis of its projected chance of leading to ‘diesel-like’ combustion was also carried out with conventional diesel fuel. It was observed that by preheating the POME fuel above the conventional temperature, the engine performance, especially the brake power output and the exhaust emissions characteristics, is improved significantly, approaching diesellike' performance. This is mainly attributed to the fact that as the fuel is preheated the viscosity is reduced close to ordinary diesel (OD) fuel. This will result in improved spray and atomization characteristics. Torque, brake power, specific fuel consumption, exhaust emissions and brake thermal efficiencies were measured and calculated. The potential for improved engine performance and reduction in emissions levels was demonstrated.

scholarly journals A Review on the Thermochemical Recycling of Waste Tyres to Oil for Automobile Engine Application

Energies ◽  
2021 ◽  
Vol 14 (13) ◽  
pp. 3837
Author(s):  
Mohammad I. Jahirul ◽  
Farhad M. Hossain ◽  
Mohammad G. Rasul ◽  
Ashfaque Ahmed Chowdhury
Keyword(s):  
Diesel Engine ◽  
Engine Performance ◽  
Calorific Value ◽  
High Viscosity ◽  
Combustion Efficiency ◽  
Fuel Additive ◽  
Pyrolysis Oil ◽  
Performance And Emission ◽  
Automobile Engines ◽  
Direct Use

Utilising pyrolysis as a waste tyre processing technology has various economic and social advantages, along with the fact that it is an effective conversion method. Despite extensive research and a notable likelihood of success, this technology has not yet seen implementation in industrial and commercial settings. In this review, over 100 recent publications are reviewed and summarised to give attention to the current state of global tyre waste management, pyrolysis technology, and plastic waste conversion into liquid fuel. The study also investigated the suitability of pyrolysis oil for use in diesel engines and provided the results on diesel engine performance and emission characteristics. Most studies show that discarded tyres can yield 40–60% liquid oil with a calorific value of more than 40 MJ/kg, indicating that they are appropriate for direct use as boiler and furnace fuel. It has a low cetane index, as well as high viscosity, density, and aromatic content. According to diesel engine performance and emission studies, the power output and combustion efficiency of tyre pyrolysis oil are equivalent to diesel fuel, but engine emissions (NOX, CO, CO, SOX, and HC) are significantly greater in most circumstances. These findings indicate that tyre pyrolysis oil is not suitable for direct use in commercial automobile engines, but it can be utilised as a fuel additive or combined with other fuels.

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