title: Performance and exhaust emission characteristics of variable compression ratio diesel engine fuelled with esters of crude rice bran oil.
abstract: As a substitute to petroleum-derived diesel, biodiesel has high potential as a renewable and environment friendly energy source. For petroleum importing countries the choice of feedstock for biodiesel production within the geographical region is a major influential factor. Crude rice bran oil is found to be good and viable feedstock for biodiesel production. A two step esterification is carried out for higher free fatty acid crude rice bran oil. Blends of 10, 20 and 40 % by vol. crude rice bran biodiesel are tested in a variable compression ratio diesel engine at compression ratio 15, 16, 17 and 18. Engine performance and exhaust emission parameters are examined. Cylinder pressure-crank angle variation is also plotted. The increase in compression ratio from 15 to 18 resulted in 18.6 % decrease in brake specific fuel consumption and 14.66 % increase in brake thermal efficiency on an average. Cylinder pressure increases by 15 % when compression ratio is increased. Carbon monoxide emission decreased by 22.27 %, hydrocarbon decreased by 38.4 %, carbon dioxide increased by 17.43 % and oxides of nitrogen as NOx emission increased by 22.76 % on an average when compression ratio is increased from 15 to 18. The blends of crude rice bran biodiesel show better results than diesel with increase in compression ratio.
authors.affiliation: Mechanical Engineering Department, Baddi University of Emerging Sciences and Technology, Baddi, India.
authors.forename: Mohit
authors.identifier: 0000-0003-0057-0962
authors.initials: M
authors.lastname: Vasudeva
authors.affiliation: Department of Mechanical Engineering, Thapar University, Patiala, India.
authors.forename: Sumeet
authors.initials: S
authors.lastname: Sharma
authors.affiliation: Department of Mechanical Engineering, Thapar University, Patiala, India.
authors.forename: S K
authors.initials: SK
authors.lastname: Mohapatra
authors.affiliation: Biofuel Department, Mechanical Engineering Research and Development Organization, Ludhiana, India.
authors.forename: Krishnendu
authors.initials: K
authors.lastname: Kundu
keywords: Crude rice bran biodiesel; Cylinder pressure; Engine performance; Exhaust emissions; Variable compression ratio