Performance, combustion and emission characteristics of a single-cylinder DI diesel engine fuelled with lotus biodiesel-diesel- n -butanol blends

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Abstract
The main aim of this present work is to test a novel biofuel on a diesel engine. The various steps involved in this research work is collection of seeds, sun drying, mechanical expelling and transesterification. This biofuel is mixed with the diesel along with n-butanol. This experimental work deals with the investigation of lotus biodiesel with different blends in addition to n-butanol as an ignition improver. The blends starts with pure diesel (D100), D90L8B2 (90% diesel 8% Lotus biodiesel and 2% butanol), D80L16B4 (80% diesel 16% Lotus biodiesel and 4% butanol), D70L24B6 (70% diesel 24% Lotus biodiesel and 6% n-butanol and L100 (100% Lotus biodiesel). The experimental results were observed at full load condition (100%) was better for the fuel D70L24B6; achieved the fuel efficiency by 28%, which is closer to diesel mode, whereas D70L24B6 attained the lowest brake specific fuel consumption; decrease in BSFC of 7% as compared to D100. The in cylinder pressure was found as 73bar for the fuel D70L24B6, which is closer to D100. After the fuel D100, the maximum HRR was found 84.1 kJ for the fuel D70L24B6. The parameter such as shorter ignition delay occurred for all alchololic lotus biodiesel blends compared to D100. The lowest CO emissions were found for the fuel L100, which decreases CO emissions by 17.2% compared to D100. The lowest carbon dioxide emissions were found for the fuel D90L8B2 fuel, decrease in 5.49% compared to D100. The lowest HC emissions at full load conditions were found for the fuel L100, decrease in HC emission rate by 16.1 % compared to pure diesel. The lowest NOx emissions were found for the fuel L100, but there is an increase in NOx emission rate by 8% compared to diesel because of higher oxygen content in biodiesel.

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