| Summary: | To meet the ever increasing energy demand of the world needs an urgent research to find an alternate fuel for diesel. Biodiesel can be a promising alternate for diesel engine in the years to come. The objective of the present experimental work is to investigate the combustion characteristics of VCR engine using mixture of two biodiesel blend with diesel at 100% or rated load, at constant speed. Simarouba and Jatropha oil are used to prepare, respective biodiesel and mixed in the volume ratio of 75:25, and is designated as B100. The combustion characteristics investigated are cylinder gas pressure, net heat and cumulative heat release, rate of pressure rise, and the mass fraction burned. Investigation is carried out varying load from zero to 100% or rated load of engine with an increment of 20% each time. Influence of blends and compression ratio on the combustion characteristics of engine is investigated. The results reveal that blends results in higher cylinder gas pressure, lesser heat release, higher rate of pressure rise and increased combustion duration. Increasing CR improve the combustion characteristics of engine. Keywords: Simarouba, Jatropha, Mixture of biodiesels, Combustion, Heat release rate
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