Cycle-to-Cycle Variation of the Combustion Process in a Diesel Engine Fueled with Rapeseed Oil—Diethyl Ether Blends

Krzysztof Górski (), Ruslans Smigins, Jonas Matijošius and Dimitrios Tziourtzioumis
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Krzysztof Górski: Faculty of Mechanical Engineering, Kazimierz Pulaski University of Technology and Humanities in Radom, ul. Chrobrego 45, 26-600 Radom, Poland
Ruslans Smigins: Faculty of Engineering, Latvia University of Life Sciences and Technologies, J. Cakstes Blvd 5, LV3001 Jelgava, Latvia
Jonas Matijošius: Department of Automobile Engineering, Faculty of Transport Engineering, Vilnius Gediminas Technical University, J. Basanavičiaus Str. 28, LT-03224 Vilnius, Lithuania
Dimitrios Tziourtzioumis: Department of Industrial Engineering and Management, International Hellenic University, 14th km Thessaloniki, 570 01 Nea Moudania, Greece

Energies, 2023, vol. 16, issue 2, 1-17

Abstract: The application of rapeseed oil (RO) blends with diesel fuel and/or alcohols and/or ethers is known to significantly affect the combustion process. Aiming to further investigate the effects of rapeseed oil in a blend with diethyl ether (DEE) on this process, the coefficient of variation of the mean indicated pressure ( COV MIP ) of a 2.5l direct injection diesel engine was calculated. The analysis of the experimental results revealed the repeatability of the combustion process variability of diesel fuel (DF), rapeseed oil (RO), and DEE/RO blends containing up to 20% DEE. In these cases, the COV MIP does not exceed 4%. Additionally, it became obvious that for a higher content of DEE in blend with RO, the cyclic repeatability of the mean indicated pressure ( MIP ) was reduced. Thus, the values of COV MIP for fuels containing 30 and 40% of DEE by vol. in blend with RO were even three times higher than the values obtained for the reference fuel i.e., DF. The results indicate that the increased content of DEE in the mixture with RO is disadvantageous as it leads to excessive unevenness of the engine operation compared to its fueling with DF. The observed deterioration of the combustion process is caused by the vapor locks, which are formed due to the evaporation of volatile DEE in the fuel line, leading to the interrupted operation of the fuel injector.

Keywords: rapeseed oil; diesel fuel; diethyl ether; combustion process; renewable fuels (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2023
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