Study on auto-ignition characteristics of ethanol and ETBE blended fuels in a gasoline HCCI engine

Takashi Kaminaga, Takashi Youso, Masahisa Yamakawa, Satoshi Ito, Akira Hozumi, Jin Kusaka

Research output: Contribution to conferencePaper

3 Citations (Scopus)

Abstract

Bio-fuels such as ethanol (EtOH) and ethyl tert-butyl ether (ETBE) are used as blending components in gasoline for carbon neutralization. These oxygenates are also recognized as high octane number fuels, which are acceptable for spark ignition (SI) combustion, as they inhibit end-gas auto-ignition (partly leading to knocking). However, for homogeneous charge compression ignition (HCCI) combustion, excess delay in ignition timing may occur as an undesirable effect, leading to misfiring or incomplete combustion. In this work, knocking phenomenon and HCCI combustion characteristics of ethanol and ETBE blended gasoline fuels with same octane numbers have been experimentally studied. Chemical reaction simulations were also conducted for further understanding. Experimental work was performed in a single cylinder gasoline engine with compression ratio set to 14.0. Intake air was heated at HCCI combustion operation. SI combustion test results show that when the same octane number fuels are used, ethanol and ETBE have no effect on knocking limit. On the other hand, HCCI combustion results indicate that ethanol retards ignition timing at low intake temperature condition, whereas ignition advancement is observed at high intake temperature condition. ETBE acted as an ignition accelerator for all intake temperatures. Based on these results, an empirical equation is proposed for HCCI timing prediction of the tested blended fuels.

Original languageEnglish
Pages416-421
Number of pages6
Publication statusPublished - 2012 Dec 1
Event8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012 - Fukuoka, Japan
Duration: 2012 Jul 232012 Jul 26

Conference

Conference8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012
CountryJapan
CityFukuoka
Period12/7/2312/7/26

Keywords

  • ETBE
  • Ethanol
  • Fuel components
  • Gasoline engine
  • HCCI
  • Knocking

ASJC Scopus subject areas

  • Control and Systems Engineering
  • Modelling and Simulation

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  • Cite this

    Kaminaga, T., Youso, T., Yamakawa, M., Ito, S., Hozumi, A., & Kusaka, J. (2012). Study on auto-ignition characteristics of ethanol and ETBE blended fuels in a gasoline HCCI engine. 416-421. Paper presented at 8th International Conference on Modeling and Diagnostics for Advanced Engine Systems, COMODIA 2012, Fukuoka, Japan.