Effect of air-excess on blends of RON70 partially premixed combustion

Research output: Contribution to journalArticleAcademicpeer-review

10 Citations (Scopus)

Abstract

Partially Premixed Combustion (PPC) is a combustion concept that aims to provide combustion with low smoke and NOx emissions and a high thermal efficiency. Extending the ignition delay to enhance premixing, avoiding spray-driven combustion, and controlling temperature at an optimum level through use of suitable dilution levels has been recognized as a key factor to achieve such a concept. Fuels with high auto-ignition resistance do extend ignition delay. In this work three ternary blends of an alcohol (ethanol or n-butanol), n-heptane and iso-octane with a target research octane number (RON) of 70 are studied. RON70 was earlier found to be close to optimal for PPC over a large load range. The objective of this research is to analyze the sensitivity of the combustion parameters to changes in air-excess ratio when using these three blends. The engine was operated at 1250 rpm and 1000 bar injection pressure with a single injection strategy. Results revealed that efficiency was increased from rich to lean combustion, and these three blends show distinct premixed combustion even in lean PPC operation. The premixed fraction of combustion however reduces with the increase of air-excess ratio, which is especially apparent for PRF70 which consists of n-heptane and iso-octane alone.
LanguageEnglish
Pages309-326
Number of pages18
JournalFlow, Turbulence and Combustion
Volume96
Issue number2
Early online date16 Nov 2015
DOIs
StatePublished - Mar 2016

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air
Air
Ignition
Heptane
octanes
heptanes
ignition
octane number
premixing
injection
spontaneous combustion
1-Butanol
thermodynamic efficiency
Antiknock rating
smoke
Butenes
Smoke
Dilution
sprayers
dilution

Keywords

  • Partially premixed combustion
  • Air-excess ratio
  • Primary reference fuel
  • IC engines

Cite this

@article{2d87e15f497e4176b76b8bf64940393a,
title = "Effect of air-excess on blends of RON70 partially premixed combustion",
abstract = "Partially Premixed Combustion (PPC) is a combustion concept that aims to provide combustion with low smoke and NOx emissions and a high thermal efficiency. Extending the ignition delay to enhance premixing, avoiding spray-driven combustion, and controlling temperature at an optimum level through use of suitable dilution levels has been recognized as a key factor to achieve such a concept. Fuels with high auto-ignition resistance do extend ignition delay. In this work three ternary blends of an alcohol (ethanol or n-butanol), n-heptane and iso-octane with a target research octane number (RON) of 70 are studied. RON70 was earlier found to be close to optimal for PPC over a large load range. The objective of this research is to analyze the sensitivity of the combustion parameters to changes in air-excess ratio when using these three blends. The engine was operated at 1250 rpm and 1000 bar injection pressure with a single injection strategy. Results revealed that efficiency was increased from rich to lean combustion, and these three blends show distinct premixed combustion even in lean PPC operation. The premixed fraction of combustion however reduces with the increase of air-excess ratio, which is especially apparent for PRF70 which consists of n-heptane and iso-octane alone.",
keywords = "Partially premixed combustion, Air-excess ratio, Primary reference fuel, IC engines",
author = "S. Wang and P.C. Bakker and L.M.T. Somers and {de Goey}, L.P.H.",
year = "2016",
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language = "English",
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Effect of air-excess on blends of RON70 partially premixed combustion. / Wang, S.; Bakker, P.C.; Somers, L.M.T.; de Goey, L.P.H.

In: Flow, Turbulence and Combustion, Vol. 96, No. 2, 03.2016, p. 309-326.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Effect of air-excess on blends of RON70 partially premixed combustion

AU - Wang,S.

AU - Bakker,P.C.

AU - Somers,L.M.T.

AU - de Goey,L.P.H.

PY - 2016/3

Y1 - 2016/3

N2 - Partially Premixed Combustion (PPC) is a combustion concept that aims to provide combustion with low smoke and NOx emissions and a high thermal efficiency. Extending the ignition delay to enhance premixing, avoiding spray-driven combustion, and controlling temperature at an optimum level through use of suitable dilution levels has been recognized as a key factor to achieve such a concept. Fuels with high auto-ignition resistance do extend ignition delay. In this work three ternary blends of an alcohol (ethanol or n-butanol), n-heptane and iso-octane with a target research octane number (RON) of 70 are studied. RON70 was earlier found to be close to optimal for PPC over a large load range. The objective of this research is to analyze the sensitivity of the combustion parameters to changes in air-excess ratio when using these three blends. The engine was operated at 1250 rpm and 1000 bar injection pressure with a single injection strategy. Results revealed that efficiency was increased from rich to lean combustion, and these three blends show distinct premixed combustion even in lean PPC operation. The premixed fraction of combustion however reduces with the increase of air-excess ratio, which is especially apparent for PRF70 which consists of n-heptane and iso-octane alone.

AB - Partially Premixed Combustion (PPC) is a combustion concept that aims to provide combustion with low smoke and NOx emissions and a high thermal efficiency. Extending the ignition delay to enhance premixing, avoiding spray-driven combustion, and controlling temperature at an optimum level through use of suitable dilution levels has been recognized as a key factor to achieve such a concept. Fuels with high auto-ignition resistance do extend ignition delay. In this work three ternary blends of an alcohol (ethanol or n-butanol), n-heptane and iso-octane with a target research octane number (RON) of 70 are studied. RON70 was earlier found to be close to optimal for PPC over a large load range. The objective of this research is to analyze the sensitivity of the combustion parameters to changes in air-excess ratio when using these three blends. The engine was operated at 1250 rpm and 1000 bar injection pressure with a single injection strategy. Results revealed that efficiency was increased from rich to lean combustion, and these three blends show distinct premixed combustion even in lean PPC operation. The premixed fraction of combustion however reduces with the increase of air-excess ratio, which is especially apparent for PRF70 which consists of n-heptane and iso-octane alone.

KW - Partially premixed combustion

KW - Air-excess ratio

KW - Primary reference fuel

KW - IC engines

U2 - 10.1007/s10494-015-9685-2

DO - 10.1007/s10494-015-9685-2

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