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Title: A study of a turbulent jet ignition system fueled with iso-octane: Pressure trace analysis and combustion visualization

Authors:
; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1413334
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Applied Energy
Additional Journal Information:
Journal Volume: 189; Journal Issue: C; Related Information: CHORUS Timestamp: 2017-12-13 22:20:56; Journal ID: ISSN 0306-2619
Publisher:
Elsevier
Country of Publication:
United Kingdom
Language:
English

Citation Formats

Gentz, Gerald, Gholamisheeri, Masumeh, and Toulson, Elisa. A study of a turbulent jet ignition system fueled with iso-octane: Pressure trace analysis and combustion visualization. United Kingdom: N. p., 2017. Web. doi:10.1016/j.apenergy.2016.12.055.
Gentz, Gerald, Gholamisheeri, Masumeh, & Toulson, Elisa. A study of a turbulent jet ignition system fueled with iso-octane: Pressure trace analysis and combustion visualization. United Kingdom. doi:10.1016/j.apenergy.2016.12.055.
Gentz, Gerald, Gholamisheeri, Masumeh, and Toulson, Elisa. Wed . "A study of a turbulent jet ignition system fueled with iso-octane: Pressure trace analysis and combustion visualization". United Kingdom. doi:10.1016/j.apenergy.2016.12.055.
@article{osti_1413334,
title = {A study of a turbulent jet ignition system fueled with iso-octane: Pressure trace analysis and combustion visualization},
author = {Gentz, Gerald and Gholamisheeri, Masumeh and Toulson, Elisa},
abstractNote = {},
doi = {10.1016/j.apenergy.2016.12.055},
journal = {Applied Energy},
number = C,
volume = 189,
place = {United Kingdom},
year = {Wed Mar 01 00:00:00 EST 2017},
month = {Wed Mar 01 00:00:00 EST 2017}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record at 10.1016/j.apenergy.2016.12.055

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • The primary reference fuels n-heptane and iso-octane and their mixtures are used as a measure of the tendency of a given automotive fuel to cause knocking or pre-ignition in an internal combustion engine. Consequently, many experimental studies have been performed on these hydrocarbons in an attempt to better understand their oxidation. Shock tube studies at high temperature and pressure have been performed. Low temperature studies, in which species concentration profiles of primary, intermediate and final products, have been carried out using jet stirred flow reactors. In addition, experiments have been performed in CFR engines and fundamental features of n-heptane autoignitionmore » have been observed using a rapid compression machine. A detailed chemical kinetic reaction mechanism is employed here to study the oxidation of both fuels. Computed results are compared with experimental data obtained in the High Pressure Turbulent Flow Reactor at Princeton University.« less
  • Autoignition of iso-octane was examined using a rapid compression facility (RCF) with iso-octane, oxygen, nitrogen, and argon mixtures. The effects of typical homogeneous charge compression ignition (HCCI) conditions on the iso-octane ignition characteristics were studied. Experimental results for ignition delay times, t{sub ign}, were obtained from pressure time-histories. The experiments were conducted over a range of equivalence ratios (f=0.25-1.0), pressures (P=5.12-23 atm), temperatures (T=943-1027 K), and oxygen mole fractions ({chi}{sub O{sub 2}}=9-21%), and with the addition of trace amounts of combustion product gases (CO{sub 2} and H{sub 2}O). It was found that the ignition delay times were well represented bymore » the expression t{sub ign}=1.3x10{sup -4}P{sup -1.05}f{sup -0.77}{chi}{sub O{sub 2}}{sup -1.41}exp(33,700/R{sub (c} {sub al/mol/K)}T), where P is pressure (atm), T is temperature (K), f is the equivalence ratio (based on iso-octane to O{sub 2} molar ratios), {chi}{sub O{sub 2}} is the oxygen mole percent (%), and t{sub ign} is the ignition delay time (ms). Carbon dioxide was found to have no chemical effect on t{sub ign}. Water was found to systematically decrease t{sub ign} by a small amount (less than 14% for the range of conditions studied). The maximum uncertainty in the measured t{sub ign} is +/-12% with an average uncertainty of +/-6%. The performance of several proposed chemical reaction mechanisms (including detailed, reduced, and skeletal mechanisms) was evaluated in the context of the current experimental results.« less
  • A detailed kinetic mechanism is proposed for the oxidation of iso-octane, n-heptane, and mixtures of them in air (number of particles 43, number of reactions 284), which satisfactorily describes the distinctive features of low-temperature and high-temperature oxidation at an initial temperature of 1200 K, pressure of 15-40 absolute atmospheres or higher, and a fuel excess ratio of 0.5-2. The abbreviated mechanisms obtained to describe the auto-ignition of fuel with an octane number of 90 involve 27 particles (38 reactions) and 18 particles (22 reactions).
  • Toluene is often used as a fluorescent tracer for fuel concentration measurements, but without considering whether it affects the auto-ignition properties of the base fuel. We investigate the auto-ignition of pure toluene and its influence on the auto-ignition of n-heptane and iso-octane/air mixtures under engine-relevant conditions at typical tracer concentrations. Ignition delay times {tau}{sub ign} were measured behind reflected shock waves in mixtures with air at {phi}=1.0 and 0.5 at p=40 bar, over a temperature range of T=700-1200 K and compared to numerical results using two different mechanisms. Based on the models, information is derived about the relative influence ofmore » toluene on {tau}{sub ign} on the base fuels as function of temperature. For typical toluene tracer concentrations {<=}10%, the ignition delay time {tau}{sub ign} changes by less than 10% in the relevant pressure and temperature range. (author)« less
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