Effect of oxygen enrichment on CI engine behavior fueled with vegetable oil: an experimental study
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Effect of oxygen enrichment on CI engine behavior fueled with vegetable oil: an experimental study S. Madhankumar1 · M. Jerome Stanley1 · S. Thiyagarajan1 · V. Edwin Geo1 · V. Karthickeyan2 · Zheng Chen3 Received: 22 May 2019 / Accepted: 8 December 2019 © Akadémiai Kiadó, Budapest, Hungary 2019
Abstract The present study investigated the effect of oxygen enrichment in a CI engine on performance, emission and combustion characteristics with mahua oil (MO) as base fuel. Poor physical properties of MO, namely high viscosity and density, cause atomization problems leading to higher smoke, HC and CO emissions. The purpose of this paper is to curb smoke emissions from MO operation and to examine the possibility of direct use of straight vegetable oil in CI engine, which can mitigate CO2 emission and be cost effective. The difficulty in the mixture formation with usage of straight vegetable oil in CI engine is addressed by increasing the oxygen concentration; a separate oxygen cylinder is used to induct oxygen. The engine used for this experimentation is a twin-cylinder tractor engine that operates at a constant speed of 1500 rpm. Performance, emission and combustion parameters were determined at different loading conditions (25, 50, 75 and 100% of rated power) with varying intake-oxygen concentration from 21% (by volume) (no enrichment) to 24% (by volume) with MO and compared with diesel. Oxygen enrichment of 24% reduced smoke, HC and CO emissions by 36, 34 and 50%, respectively, at maximum load condition. The study revealed that oxygen enrichment improved the direct combustion of MO with reduced smoke, HC and CO emissions. BTE was reduced by about 5% with MO in comparison with diesel at maximum load condition. BTE was improved by 10% with 24% (by volume) with MO at maximum load in comparison with neat MO. Keywords Straight vegetable oil · Mahua oil · Oxygen enrichment · Smoke emission · NO emission · CO2 emission Abbreviations MO Mahua oil NO Nitrous oxide CO2 Carbon dioxide TDC Top dead center CI Compression ignition rpm Revolutions per minute HC Hydrocarbon CO Carbon mono oxide BTE Brake thermal efficiency BSEC Brake specific fuel consumption * S. Thiyagarajan [email protected] 1
Green Vehicle Technology Research Centre, Department of Automobile Engineering, SRM Institute of Science and Technology, Kattankulathur 603203, India
2
Department of Mechanical Engineering, Sri Krishna College of Engineering and Technology, Coimbatore 641 008, India
3
Research Center for Advanced Powertrain Technology, Department of Energy and Power Engineering, Hunan University, Changsha 410082, People’s Republic of China
EGT Exhaust gas temperature BP Brake power
Introduction The massive increase in vehicle population instigated the transient scarcity of petroleum oil. Petroleum-based oil is the primary source of fuel, which is the combustible for predominant vehicle categories. The rich carbon content in these fuels produces thicker energy density, which makes it harder to find the new replacement. A
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