Investigations on Performance and Emission Characteristics of Diesel Engine with Jatropha Biodiesel and Its Blends

D. Ramesh, A. Sampathrajan


A 5.2 kW diesel engine with alternator was used to test jatropha biodiesel and its blends. A
pilot plant was developed for biodiesel production from different vegetable oils and used for
this study. In the case of jatropha biodiesel alone, the fuel consumption in the diesel engine
was about 14 per cent higher than that of diesel. The percent increase in specific fuel
consumption ranged from 3 to 14 for B20 to B100 fuels. The brake thermal efficiency for
biodiesel and its blends was found to be slightly higher than that of diesel fuel at tested load
conditions and there was no difference between the biodiesel and its blended fuels
efficiencies. For jatropha biodiesel and its blended fuels, the exhaust gas temperature
increased with increase in load and amount of biodiesel. The highest exhaust gas temperature
was observed as 463ºC for biodiesel among the three load conditions. The diesel mode
exhaust gas temperature was observed as 375ºC. The CO2 emission from the biodieselfuelled
engine was slightly higher than diesel fuel as compared with diesel. The carbon
monoxide reduction by biodiesel was 16, 14 and 14 per cent at 2, 2.5 and 3.5 kW load
conditions. The NOx emissions from biodiesel was increased by 15, 18 and 19 per cent
higher than that of the diesel at 2, 2.5 and 3.5 kW load conditions respectively.

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