Search Results

A theoretical model was developed for various equivalence ratios to evaluate the performance characteristics and combustion parameters of vegetable oil esters like Jatropha, Mahua and Neem and they are compared to diesel fuel. The combustion characteristics and performance parameters were predicted for different vegetable oil esters and for various equivalence ratios. From the predicted results, it was found that the heat release and work done were reduced by about 4% for Jatropha, 6% for Mahua and 8% for Neem oil esters when compared to diesel. However, slight increase was observed for specific fuel consumption. The harmful pollutants such as HC, CO, NOx and smoke were reduced in the vegetable oil esters than diesel fuel. From the investigation it was concluded that the performance of vegetable oil esters such as Jatropha, Mahua, and Neem are much better. Thus the developed model was highly capable for simulation work with bio-diesel as a suitable alternative fuel for diesel.

The demand for compression ignition engines is continuously growing due to their good fuel efficiency. But they cause lot of concern with regard to exhaust emissions. This concern sought to examine ways by which the composition of the fuel used by CI engines could be changed to reduce emissions. The addition of oxygen containing compounds to diesel fuel has been proposed as a method to complete the oxidation of carbonaceous particulate matter and associated hydrocarbons. In addition many oxygenate have high cetane number and their association with diesel results in high cetane number and hence lower exhaust emissions. Due to this advantages, there is growing interest in the introduction of oxygenates into diesel fuel. The performance and emission characteristics of two kinds of oxygenates 2-Ethoxy Ethyl Acetate, 2-Butoxy Ethanol with three different blends were investigated.

The present review aims to study the prospects and opportunities of introducing vegetable oils and their derivatives as fuels in diesel engines. A survey of recent studies and research on vegetable oil based fuels is given within the historical context. Fuel related properties are reviewed and compared with conventional diesel fuel. The use of neat vegetable oil (edible and/or non-edible), biodiesel and its blends in a diesel engine has been discussed. Performance and emission characteristics are highlighted. Suitability of different combustion chambers for diesel engine operation with vegetable oils is outlined. Techniques to decrease viscosities are discussed. Current developments on the use of vegetable oils and its blends, biodiesel and its blends in diesel engines are examined.