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Seung Ook Kim(김승욱),Minh Bau Loung,Chun Sang Yoo(유춘상) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.2013 No.12
Two-dimensional direct numerical simulations (DNSs) of the ignition of lean primary reference fuel (PRF)/air mixtures at high pressure and intermediate temperature near negative temperature coefficient (NTC) regime were performed to elucidate the effects of fuel composition, thermal stratification, and turbulence on PRF homogeneous charge compression-ignition (HCCI) combustion. In general, it was found that the mean heat release rate increases slowly and the overall combustion occurs fast with increasing thermal stratification regardless of the fuel composition. In addition, the effect of the fuel composition on the ignition characteristics of PRF/air mixtures was found to be significantly reduced with increasing thermal stratification. The reduction of the fuel effect under the high degree of thermal stratification is caused by the nearly identical propagation characteristics of deflagrations of different PRF/air mixtures. Ignition Damkohler number is proposed to quantify the successful development of deflagrations from nascent ignition kernels. It was verified that for cases with large ignition Damkohler number, turbulence with high intensity and short-timescale can advance the overall combustion by increasing turbulent flame area instead of homogenizing initial mixture inhomogeneities.
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