An investigation of mixing stratification of DME and n-Butane in HCCI engines using chemiluminescence imaging

Osamu Iwama, Satoshi Yamaoki, Norimasa Iida

Research output: Contribution to conferencePaper

4 Citations (Scopus)

Abstract

In HCCI engines, high load operation is limited by an excessive pressure rise rate (PRR). Past studies showed that mixing stratification with the fuel that has large heat release in low temperature reaction (LTR), disperses the timing of local ignition and slows the PRR. The purpose of this study was to gain a better understanding of effect of the mixing stratification on HCCI combustion using chemiluminescence imaging. Di-methyl ether (DME) which has large heat release in LTR and n-Butane, smaller heat release in LTR than that of DME, were used. Experiments were conducted on five mixing conditions depending on the combination of the charging methods (homogeneous charge or stratified charge) of DME and n-Butane, using a single-cylinder engine equipped with optical access. Chemiluminescence imaging was used to assess a local combustion phasing. The experimental observation shows that, in the case of fuels stratification, maximum PRR is reduced compared to the case of fuels homogeneity. In the stratified case, the start timing of local chemiluminescence is dispersed and total chemiluminescence duration is longer than that of the homogeneous case.

Original languageEnglish
Pages97-104
Number of pages8
Publication statusPublished - 2008 Dec 1
Event7th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2008 - Sapporo, Japan
Duration: 2008 Jul 282008 Jul 31

Other

Other7th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2008
CountryJapan
CitySapporo
Period08/7/2808/7/31

Keywords

  • Chemiluminescence
  • HCCI
  • Stratification

ASJC Scopus subject areas

  • Automotive Engineering
  • Control and Systems Engineering
  • Modelling and Simulation

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    Iwama, O., Yamaoki, S., & Iida, N. (2008). An investigation of mixing stratification of DME and n-Butane in HCCI engines using chemiluminescence imaging. 97-104. Paper presented at 7th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2008, Sapporo, Japan.