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The rising cost and exponential depletion of crude oil in international market has provided an opportunity for the researchers to evaluate the utilization and suitability of various renewable fuels. Amongst variety of alternative fuels, biofuels have the potential to mitigate the vulnerability and the adverse effects of use of fossil fuels. Vegetable/plant oil is better proposition as alternative fuel for diesel engine having much advantage over other alternative fuels. Orange oil from its peel has a huge potential and can be used as an alternate fuel at the most economical purchase rate. In the present investigation experiments were carried out to evaluate performance and emission characteristics of Orange peel oil methyl ester blends (OPOME) (10%, and 20% by volume) on unmodified diesel engine. The properties of these blends were found to be comparable to diesel and confirming to both the American and European standards.

The growing energy demand and limited petroleum resources in the world have guided researchers towards the use of clean alternative fuels like alcohols for their better tendency to decrease the engine emissions. To comply with the future stringent emission standards, innovative diesel engine technology, exhaust gas after-treatment, and clean alternative fuels are required. The use of alcohols as a blending agent in diesel fuel is rising, because of its benefits like enrichment of oxygen, premixed low temperature combustion (LTC) and enhancement of the diffusive combustion phase. Several researchers have investigated the relationship between LTC operational range and cetane number. In a light-duty diesel engine working at high loads, a low-cetane fuel allowed a homogeneous lean mixture with improved NOx and smoke emissions joint to a good thermal efficiency.