• Title/Summary/Keyword: Di-Methyl Ethel(DME)

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Using Two-Dimensional Chemiluminescence Images to Study Inhomogeneity in Mixture Gas in the Combustion Chamber for HCCI Combustion (이차원발광화상계측에 의한 예혼합압축자기착화연소의 연소실내 혼합기의 불균질성에 관한 연구)

  • Lim, Ock-Taeck;Iida, Norimasa
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.34 no.12
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    • pp.1043-1050
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    • 2010
  • Fuel stratification and thermal stratification occur in the HCCI combustion chamber on a microscopic scale. They affect the ignition and combustion processes. In this study, the effect of the inhomogeneity in the mixture gas on the HCCI combustion process was investigated. Two-dimensional chemiluminescence images were captured using a framing camera to evaluate the flame structure. DME was used as the test fuel. First, the effect of inhomogeneity in the fuel distribution in the premixture was investigated for the four-stroke optically accessible engine. Then, by comparing the combustion of the homogeneous mixture in the rapid compression machine, which does not contain any residual gas, with the combustion in the four-stroke engine, the effect of inhomogeneity in temperature due to the residual gas was analyzed. The results showed that a time lag appears spatially in combustion under inhomogeneous conditions in the four-stroke engine. The spatial variation in the combustion without the residual gas in the rapid compression machine is less than that in the combustion in the four-stroke engine.