Experimental Analysis of Diesel Engine Using Biofuel at Varying Compression Ratio

Abstract

Environmental concern and availability of petroleum fuels have caused interest in the search for alternative fuels for internal combustion engine. Many alternate fuels are tried by various researches. Based on literature review it is found that for diesel engine Bio Diesel is most promising fuel. In this project works prospects and opportunities of increasing biodiesel-diesel blend ratio as fuel in diesel engine is going to be studied by varying compression ratio. Also based on experimentation an optimum blend and engine parameters are to be suggested for obtaining better performance and emission control. Biodiesel present a very promising scenario of functioning as alternative fuels to fossil diesel fuel. The properties of these can be compared favorably with the characteristics required for internal combustion engine fuels specially diesel engine. Preliminarily to compare performance of biodiesel-diesel blend with base cases i.e. performance of engine using diesel as a fuel, experiments were performed to study ef- fect of variation of compression ratio on brake power, brake specific fuel consumption and brake thermal efficiency of diesel engine using diesel as a fuel at various loads ranging from 0.5% to 100%. Out of three compression ratio that is 14, 16 and 18, 18 compression ratio results of brake thermal e ciency, brake speci c fuel consumption and brake power , is better results compared to other. In diesel-biodiesel blend as percentage of biodiesel increase emission of carbon monoxide (CO), carbon dioxide (CO2), unburned hydro carbon (HC) and oxides of nitrogen (NOx) decrease. As per the literature survey B20 (20%biodiesel and 80% diesel) is best in performance compare to other blends.