Pressure sensitivity of HCCI auto-ignition temperature for oxygenated reference fuels

Ida Truedsson, Martin Tuner, Bengt Johansson, William Cannella

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

2 Scopus citations

Abstract

The current research focuses on creating an HCCI fuel index suitable for comparing different fuels for HCCI operation. One way to characterize a fuel is to use the Auto-Ignition Temperature (AIT). The AIT can be extracted from the pressure trace. Another potentially interesting parameter is the amount of Low Temperature Heat Release (LTHR) that is closely connected to the ignition properties of the fuel. The purpose of this study was to map the AIT and amount of LTHR of different oxygenated reference fuels in HCCI combustion at different cylinder pressures. Blends of n-heptane, iso-octane and ethanol were tested in a CFR engine with variable compression ratio. Five different inlet air temperatures ranging from 50°C to 150°C were used to achieve different cylinder pressures and the compression ratio was changed accordingly to keep a constant combustion phasing, CA50, of 3±1° after TDC. The experiments were carried out in lean operation with a constant equivalence ratio of 0.33 and with a constant engine speed of 600 rpm. The amount of ethanol needed to suppress LTHR from different PRFs was evaluated. The AIT and the amount of LTHR for different combinations of n-heptane, iso-octane and ethanol were charted.

Original languageEnglish (US)
Title of host publicationASME 2012 Internal Combustion Engine Division Fall Technical Conference, ICEF 2012
Pages277-291
Number of pages15
DOIs
StatePublished - Dec 1 2012
EventASME 2012 Internal Combustion Engine Division Fall Technical Conference, ICEF 2012 - Vancouver, BC, Canada
Duration: Sep 23 2012Sep 26 2012

Publication series

NameASME 2012 Internal Combustion Engine Division Fall Technical Conference, ICEF 2012

Other

OtherASME 2012 Internal Combustion Engine Division Fall Technical Conference, ICEF 2012
CountryCanada
CityVancouver, BC
Period09/23/1209/26/12

Keywords

  • Auto-ignition Temperature
  • HCCI
  • LTHR
  • Reference fuels

ASJC Scopus subject areas

  • Fuel Technology

Fingerprint

Dive into the research topics of 'Pressure sensitivity of HCCI auto-ignition temperature for oxygenated reference fuels'. Together they form a unique fingerprint.

Cite this