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The effect of addition of jatropha biodiesel to mineral diesel on the performance and emission characteristics of a conventional compression ignition engine have been experimentally investigated and compared with simulated data using Diesel-RK software. The experiments were carried out using pure diesel (B0) and pure jatropha biodiesel (JB100) as fuels. The performance characteristics shows that brake specific fuel consumption (BSFC) increases and brake thermal efficiency decreases with the use of jatropha biodiesel. Experimentally, pure diesel has maximum efficiency 29.6%, where as pure biodiesel has maximum efficiency of 21.2%. In the simulation, the pure diesel has maximum efficiency 30.3% where as pure jatropha biodiesel has the maximum efficiency of 27.5%. In respect of emission characteristics, NO x emission is found to increase with load as well as use of biodiesel in both experimental and simulation study. After the successful validation of the numerical study with the experimental, another simulation was done, where the performance, combustion and emission characteristics of the same engine fueled with pure diesel (B0), pure jatropha biodiesel (JB100) and 50% jatropha blend (JB50) were derived. In the numerical study it is found that, with the use of jatropha biodiesel the BSFC increases whereas brake thermal efficiency decreases. Combustion characteristics show an increase in peak cylinder pressure and a decrease in ignition delay period with the increase in biodiesel share in the blends; whereas the emission of NO x and CO 2 increases; smoke and PM emission decreases for the same.

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Biofuels are mainly obtained from biological materials, mostly from plants, animals, wastes and microorganisms [1]. Biomass is organic components are the source of substitute energy and it contains all classes of biofuels like solid, gaseous and liquid fuels. These can be achieved from biomass [2,3]. Biomass for alternative energy might be engaged in various ways. An outline of the different possible options to use biomass [4] is presented in Scheme-I. Solid biofuels are mostly firewood, charcoal and fibrous matters. Fossil fuels like firewood and charcoal are extensively utilized as a primary fuel domiciliary purpose that is cooking. Fibrous type of material can be obtained from sugar cane processing and it is widely used for power generation and preparation of steam [5]. Methane and producer gases are mainly the gaseous biofuels and these can be obtained by fermentation of domestic animal wastes and from the pyrolysis [6] or gasification of agricultural wastes and wood. Different kind of liquid biofuels like methanol, ethanol, organic oils and the methyl esters are generally attributed as biodiesel [7]. Solids and liquids biofuels are used

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