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Pressure Sensitivity of HCCI Auto-Ignition Temperature for Oxygenated Reference Fuels

Truedsson, Ida LU ; Tunér, Martin LU ; Johansson, Bengt LU and Cannella, William (2013) In Journal of Engineering for Gas Turbines and Power 135(7).
Abstract
The current research focuses on creating a homogeneous charge compression ignition (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 the 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 cooperative fuels research (CFR) engine with a variable compression ratio.... (More)
The current research focuses on creating a homogeneous charge compression ignition (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 the 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 cooperative fuels research (CFR) engine with a variable compression ratio. Five different inlet air temperatures ranging from 50 degrees C to 150 degrees 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 deg after top dead center (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 the LTHR from different primary reference fuels (PRFs) was evaluated. The AIT and the amount of LTHR for different combinations of n-heptane, iso-octane, and ethanol were charted. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
HCCI, auto-ignition temperature, LTHR, reference fuels
in
Journal of Engineering for Gas Turbines and Power
volume
135
issue
7
publisher
American Society of Mechanical Engineers
external identifiers
  • wos:000326157000014
  • scopus:84903693180
ISSN
1528-8919
DOI
10.1115/1.4023614
language
English
LU publication?
yes
id
20234400-66fc-423f-9548-1d60dde6b4bc (old id 4212994)
date added to LUP
2013-12-18 12:47:36
date last changed
2019-01-20 03:23:13
@article{20234400-66fc-423f-9548-1d60dde6b4bc,
  abstract     = {The current research focuses on creating a homogeneous charge compression ignition (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 the 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 cooperative fuels research (CFR) engine with a variable compression ratio. Five different inlet air temperatures ranging from 50 degrees C to 150 degrees 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 deg after top dead center (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 the LTHR from different primary reference fuels (PRFs) was evaluated. The AIT and the amount of LTHR for different combinations of n-heptane, iso-octane, and ethanol were charted.},
  articleno    = {072801},
  author       = {Truedsson, Ida and Tunér, Martin and Johansson, Bengt and Cannella, William},
  issn         = {1528-8919},
  keyword      = {HCCI,auto-ignition temperature,LTHR,reference fuels},
  language     = {eng},
  number       = {7},
  publisher    = {American Society of Mechanical Engineers},
  series       = {Journal of Engineering for Gas Turbines and Power},
  title        = {Pressure Sensitivity of HCCI Auto-Ignition Temperature for Oxygenated Reference Fuels},
  url          = {http://dx.doi.org/10.1115/1.4023614},
  volume       = {135},
  year         = {2013},
}