Paper Submission: 25 July 2021
Author Notification: 7 to 10 days
Journal Publication: July 2021
Ajeet Kumar , S.K. Shukla C, J.V. Tirkey
Many researchers working on the vegetable oil used as alternative fuel in CI engine in last few decades. Some of these researchers have proposed the diesel replace by vegetable oil because of their agricultural origin, lower exhaust emissions and without altering the performance. In the present research paper, an experimental investigation analysis the performance and emission characteristics of single cylinder, 4 stroke, water cooled, variable compression ignition engine runs at constant speed. Coconut biodiesel blends (B10, B20, B30, B40 and B50) with diesel used as fuel. The experimental works have been carried out on VCR engine with varying loads (0 to 12 kg) at different compression ratios (15 to 18). These experiments have been conducted for comparative analysis of engine performances (brake thermal efficiency, brake power, IMEP, engine torque, mechanical efficiency and specific fuel consumption) and exhaust emissions (carbon monoxide, hydrocarbon, nitrogen oxides and carbon dioxide) of coconut biodiesel blends with diesel. In this analysis it was found that BTE increases with load and compression ratio. Higher BTE for B10 as compare to diesel and other blends. Maximum BTE is 40.51 % for B10 at peak load (12 kg) when engine runs at 18 CR. With increasing the compression ratio engine torque also increases. Higher torque for diesel as compared to other blends. As load and compression ratio increases mechanical efficiency also increases. While engine running at peak load B50 shows the maximum specific fuel consumption (0.39 kg/kWh) at CR 17. There is slight reduction in brake power with compression ratio for all the fuel blends. The blend B10 showing comparable brake power with standard diesel. The indicated mean effective pressure increases with increasing both engine load and compression ratio. The Nox emission increases with increasing the compression ratio. There is significant reduction in hydrocarbon emissions (HC) and carbon monoxide (CO) with increasing the load and compression ratio. Higher CO2 emissions for all blends and at higher CR.
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Centre for Energy and Resources Development, Department of Mechanical Engineering, Indian Institute of Technology (Banaras Hindu University), Varanasi, India-221005
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