The continuous increasing demand for energy and the decreasing petroleum resources has led to the search for alternative fuel which is renewable and sustainable. In this work, Pongamia biodiesel (50%) diesel (45%) butanol 5% (by volume) (B50D45Bu5), Pongamia biodiesel (50%) diesel (40%) butanol 5% (B50D40Bu10),Pongamia biodiesel (50%) diesel (35%)butanol 15% (B50D35Bu15) with 3% 2-Ethylhexyl nitrate (EHN) additive fuels were tested to evaluate the effects of the fuel blends on the performance and exhaust emissions of a diesel engine. 2-Ethylhexyl nitrate (EHN) has been used as a commercial cetane improver for a number of years and today is the predominant cetane improving additive. Engine performance parameters and exhaust gas emissions such as nitrogen oxides, carbon monoxide and hydrocarbon were measured. The results showed that butanol addition caused a slight reduction in B.S.F.C and increase in brake thermal efficiency; the emission values of the engine were improved. Therefore,2-Ethylhexyl nitrate (EHN) can be used as a very promising additive to biodiesel butanol diesel blends.
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