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Soot and chemiluminescence in diesel combustion of bio-derived, oxygenated and reference fuels

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Author: Klein-Douwel, R.J.H. · Donkerbroek, A.J. · Vliet, A.P. van · Boot, M.D. · Somers, L.M.T. · Baert, R.S.G. · Dam, N.J. · Meulen, J.J. ter
Type:article
Date:2009
Institution: TNO Industrie en Techniek
Source:32nd International Symposium on Combustion, 3 August 2008 through 8 August 2008, Montreal, QC, 32 II, 2817-2825
series:
Proceedings of the Combustion Institute
Identifier: 241628
doi: doi:10.1016/j.proci.2008.06.140
Keywords: Energy · Bio-derived fuel · Chemiluminescence · Ignition delay · Oxygenated fuel · Soot incandescence · Bio-derived fuel · Crank angle · Cyclohexanone · Diesel combustion · Fischer Tropsch · Heat release · Heat release rates · Heavy-duty diesel engine · High speed imaging · Hot combustion · Ignition delay · Ignition delays · Jatropha · Methyl esters · NO concentration · Oxygen content · Oxygenated fuel · Peak temperatures · Soot abatement · Total oxygen · Chemiluminescence · Diesel engines · Dust · Ignition · Light emission · Light measurement · Molecular oxygen · Smoke · Soot · Synthetic fuels · Thermochemistry · Leakage (fluid)

Abstract

High-speed imaging, spectroscopy and thermodynamical characterization are applied to an optically accessible, heavy-duty diesel engine in order to compare sooting and chemiluminescence behaviour of bio-derived, oxygenated fuels and various reference fuels. The fuels concerned include the bio-derived fuels Jatropha oil (pure), Jatropha-methylester (JME) and rapeseed-methylester (RME), all containing ≈10%mass oxygen, and fossil oxygenated fuels tripropyleneglycolmonomethylether (TPGME) and cyclohexanone, both mixed with synthetic fuel to have similar total oxygen content. Commercial diesel, model fuel IDEA, a Fischer-Tropsch synthetic fuel (FT) and a blend containing cyclohexane serve as reference fuels. The start of hot combustion is derived from OH* and CH* chemiluminescence as observed through a spectrograph. Both species occur at about the same time, CH* signal being weaker. Soot incandescence is observed twodimensionally at 0.3° crank angle resolution (200 images/cycle). Ignition delays derived from soot incandescence and chemiluminescence are compared to those determined from heat release. The heat release rate and exhaust NO concentrations are used as indicators of average and peak temperatures, respectively, which are combined with soot incandescence signal to get a relative measure for a fuel's sooting propensity. Both the fuel molecular structure and its oxygen content are found to be important for soot abatement. © 2009 The Combustion Institute. Published by Elsevier Inc. All rights reserved.