Journal
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
Volume 47, Issue 8, Pages 1096-1106Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ijthermalsci.2007.07.009
Keywords
LHR diesel engine; injection timing; NOx emissions; fuel consumption; equivalence ratio
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In this study, an experimental study of the effects of injection timing on nitrogen oxide (NOx) emissions of a low heat rejection (LHR) turbocharged direct injection diesel engine was conducted. The injection timing and brake specific fuel consumption (BSFC) trade-off must be considered together in performance and NOx emissions analysis. For the original injection timing of the 20 degrees before top dead centre, the brake specific fuel consumption value of the LHR engine was approximately 6% lower than the original engine. NOx emissions were also higher (about 9%) than the original engine. To reduce NOx emissions released by diesel engines, the method of injection timing retard was utilized. Thus, the LHR engine was tested for two different injection timings; 18 degrees and 16 degrees crank angle before top dead centre (BTDC), at the same engine speeds and load conditions. The results showed that the BSFC and NO, emissions were reduced 2% and 11%, respectively by retarding the injection timing. Optimum injection timing for the LHR engine was obtained through decreasing by 2 degrees BTDC. (c) 2007 Elsevier Masson SAS. All rights reserved.
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