In the present study, a chamfered piston crown design was used in order to reduce unburned hydrocarbon (UHC) emissions from the ring-pack crevice. Compared to the conventional piston design, the chamfered piston showed 17–41% reduction in the crevice-borne UHC emissions in homogeneous charge compression ignition (HCCI) combustion. Through parametric sweeps 6 mm was identified to be a suitable chamfer size and the mechanism of the UHC reduction was revealed. Based on the findings in this study, the chamfered piston design was also tested in dual-fuel reactivity controlled compression ignition (RCCI) combustion. In the tested RCCI case using the chamfered piston the UHC and CO emissions were reduced by 79% and 36%, respectively, achieving 99.5% combustion efficiency. This also improved gross indicated thermal efficiency (gITE) from 51.1% to 51.8% in a 9 bar indicated mean effective pressure (IMEP) RCCI combustion case.
Improving the Efficiency of Low Temperature Combustion Engines Using a Chamfered Ring-Land
Contributed by the Combustion and Fuels Committee of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received March 8, 2015; final manuscript received March 25, 2015; published online May 12, 2015. Editor: David Wisler.
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Lim, J. H., and Reitz, R. D. (November 1, 2015). "Improving the Efficiency of Low Temperature Combustion Engines Using a Chamfered Ring-Land." ASME. J. Eng. Gas Turbines Power. November 2015; 137(11): 111509. https://doi.org/10.1115/1.4030284
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