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The relevance of different fuel indices to describe autoignition behaviour of gasoline in light duty dici engine under ppc mode

Aziz, Amir LU ; Li, Changle LU ; Verhelst, Sebastian LU and Tuner, Martin LU (2019) SAE World Congress Experience, WCX 2019 In SAE Technical Papers 2019.
Abstract


Partially premixed combustion (PPC) with gasoline fuels is a new promising combustion concept for future internal combustion engines. However, many researchers have argued the capabilities of research octane number (RON) and Motor Octane Number (MON) to describe the autoignition behaviour of gasoline fuels in advanced combustion concepts like PPC. The objective of this study is to propose a new method, called PPC number, to characterize the auto ignition quality of gasoline fuels in a light-duty direct injected compression ignition engine under PPC conditions. The experimental investigations were performed on a 4-cylinder Volvo D4 2 litre engine. The ignition delay which was... (More)


Partially premixed combustion (PPC) with gasoline fuels is a new promising combustion concept for future internal combustion engines. However, many researchers have argued the capabilities of research octane number (RON) and Motor Octane Number (MON) to describe the autoignition behaviour of gasoline fuels in advanced combustion concepts like PPC. The objective of this study is to propose a new method, called PPC number, to characterize the auto ignition quality of gasoline fuels in a light-duty direct injected compression ignition engine under PPC conditions. The experimental investigations were performed on a 4-cylinder Volvo D4 2 litre engine. The ignition delay which was defined as the crank angle degrees between the start of injection (SOI) and start of combustion (SOC) was used to represent the auto ignition quality of a fuel. The ignition delays of primary reference fuels PRF (blends of n-heptane and iso-octane) were used to develop a reference curve where a PPC metric for gasoline could be based on. The PPC number of a specific gasoline is defined as the octane number of the PRF, which has the same ignition delay as gasoline under the same operating condition. Twelve different gasolines, having RON values between 55 and 95, were tested at two different operating conditions of 0% exhaust gas recirculation (EGR) and 40% EGR levels namely Case0 and Case40 respectively. The intake pressures of Case0 and Case40 were 1.5 bar and 1.8 bar respectively with a constant inlet temperature of 110
o
C. The PPC numbers of all gasolines were measured and the relevancy of the other indices such as RON, MON, Octane Index and HCCI number were assessed. When the indices were compared, PPC number showed consistence and continues correlations with ignition delays in both conditions. Results also revealed that the spray target and piston geometry gave a big impact to the auto ignition quality of fuels.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
host publication
Technical Paper - WCX SAE World Congress Experience
series title
SAE Technical Papers
volume
2019
article number
2019-01-1147
publisher
Society of Automotive Engineers
conference name
SAE World Congress Experience, WCX 2019
conference location
Detroit, United States
conference dates
2019-04-09 - 2019-04-11
external identifiers
  • scopus:85064648116
ISSN
0148-7191
DOI
10.4271/2019-01-1147
language
English
LU publication?
yes
id
a328aa97-f999-471d-8a97-8136ff290fb4
date added to LUP
2019-05-03 12:06:30
date last changed
2020-03-24 06:47:56
@inproceedings{a328aa97-f999-471d-8a97-8136ff290fb4,
  abstract     = {<p><br>
                                                         Partially premixed combustion (PPC) with gasoline fuels is a new promising combustion concept for future internal combustion engines. However, many researchers have argued the capabilities of research octane number (RON) and Motor Octane Number (MON) to describe the autoignition behaviour of gasoline fuels in advanced combustion concepts like PPC. The objective of this study is to propose a new method, called PPC number, to characterize the auto ignition quality of gasoline fuels in a light-duty direct injected compression ignition engine under PPC conditions. The experimental investigations were performed on a 4-cylinder Volvo D4 2 litre engine. The ignition delay which was defined as the crank angle degrees between the start of injection (SOI) and start of combustion (SOC) was used to represent the auto ignition quality of a fuel. The ignition delays of primary reference fuels PRF (blends of n-heptane and iso-octane) were used to develop a reference curve where a PPC metric for gasoline could be based on. The PPC number of a specific gasoline is defined as the octane number of the PRF, which has the same ignition delay as gasoline under the same operating condition. Twelve different gasolines, having RON values between 55 and 95, were tested at two different operating conditions of 0% exhaust gas recirculation (EGR) and 40% EGR levels namely Case0 and Case40 respectively. The intake pressures of Case0 and Case40 were 1.5 bar and 1.8 bar respectively with a constant inlet temperature of 110                             <br>
                            <sup>o</sup><br>
                                                         C. The PPC numbers of all gasolines were measured and the relevancy of the other indices such as RON, MON, Octane Index and HCCI number were assessed. When the indices were compared, PPC number showed consistence and continues correlations with ignition delays in both conditions. Results also revealed that the spray target and piston geometry gave a big impact to the auto ignition quality of fuels.                         <br>
                        </p>},
  author       = {Aziz, Amir and Li, Changle and Verhelst, Sebastian and Tuner, Martin},
  booktitle    = {Technical Paper -  WCX SAE World Congress Experience },
  issn         = {0148-7191},
  language     = {eng},
  month        = {04},
  publisher    = {Society of Automotive Engineers},
  series       = {SAE Technical Papers},
  title        = {The relevance of different fuel indices to describe autoignition behaviour of gasoline in light duty dici engine under ppc mode},
  url          = {http://dx.doi.org/10.4271/2019-01-1147},
  doi          = {10.4271/2019-01-1147},
  volume       = {2019},
  year         = {2019},
}