Performance and exhaust emissions of direct‐injection diesel engine operating on rapeseed oil and its blends with diesel fuel

Abstract

During engine operation at 1 400, 1 800 and 2 200 min^‐1 the brake specific fuel consumption has on an average been increased by 0,104 %, 0,134 % and 0,156 % for every 1 % point increase in RO inclusion into DF. The maximum thermal efficiency values remain within 0,37–0,39 intervals. The maximum NO_x emission increases with the mass percent of oxygen in the fuel blend and for RO and its blends RO75 and RO50 are higher by 9,2 %, 20,7 % and 5,1 %, respectively. Emissions of NO₂ increase with an increasing content of RO premixed into DF. When operating on pure RO and its blends RO75 and RO50 the maximum CO emission reduces by 40,5 % ‐52,9 % and 7,2 %‐15,0 %, respectively. The smoke opacity generated from RO and its blends is also by 27,1% ‐34,6 % and 41,7 % ‐51,0 % lower. Emissions of HC remain on a considerably low level ranging between 8 to 16 ppm whereas during engine operation on pure RO they approach to about a zero level. Emissions of CO₂ for RO and fuel blend RO75 are slightly higher.

First Published Online: 27 Oct 2010

Keyword : Diesel engine, rapeseed oil, fuel blends, performance efficiency, emissions, smoke opacity