The Effects of Stroke-to-Bore Ratio on HCCI Combustion

Paper #:
  • 2010-01-0842

Published:
  • 2010-04-12
Citation:
Lee, C., Goel, S., and Babajimopoulos, A., "The Effects of Stroke-to-Bore Ratio on HCCI Combustion," SAE Technical Paper 2010-01-0842, 2010, https://doi.org/10.4271/2010-01-0842.
Pages:
12
Abstract:
This paper discusses the effects of stroke-to-bore (S/B) ratio on HCCI combustion. KIVA-3V, coupled with a multi-zone detailed chemical kinetics solver, is used to quantify the effects of changes in S/B ratio to heat transfer, thermal stratification and HCCI combustion. Three S/B ratios (0 5, 1.1 and 1.5) are analyzed. The results indicate that a cylinder with smaller S/B has more heat losses and lower thermal efficiency compared with a cylinder with larger S/B ratio, because of larger area-to-volume ratio near TDC. Moreover, the lowest S/B ratio case has a narrower temperature distribution before the onset of combustion. This leads to shorter burn duration, higher heat release rate and, consequently, increased knocking tendency. The emission results also favor the higher S/B ratio, with S/B=0.5 having the highest CO and HC emissions for relatively early combustion phasing; however, this trend is reversed as combustion is retarded.
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