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Experimental and CFD Study on Combustion Noise and Pollutant Emissions of Diesel Engine with Split Injections of Common Rail System
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SHI Xiuyong1,2,QIAO Xinqi2,NI Jimin1,ZHENG Yuanyuan3
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（1. College of Automotive Studies, Tongji University, Shanghai 201804, China; 2. School of Mechanical Engineering, Shanghai Jiaotong University, Shanghai 200240, China; 3. Department of Civil Engineering, Shandong Jiaotong University, Jinan 250023, China）
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Abstract In order to explore the impact laws of split injection strategies on combustion noise and emission characteristics, experimental studies and CFD simulations were conducted on a heavy duty diesel engine with common rail sytem, by varying different pilot and post injection parameters. The results showed that the combustion noise was mitigated by introducing fuel pilotinjection; the NOx emission could be reduced by pilotinjection combination of 1.0 mg fuel quantity and/or 45°CA injection interval, without penalty of PM emission too much. Besides, PM emission could be decreased under all postinjection conditions with no NOx increased. More important, through CFD simulation with HARR soot model revised showed that the turbulent flow motion caused by postinjection spray was one of the key factors enhancing soot oxidization.
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Received: 16 September 2009
Published: 30 November 2010
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