The autoignition of iso-cetane at high to moderate temperatures and elevated pressures: Shock tube experiments and kinetic modeling

Journal Article · Sun Nov 15 00:00:00 EST 2009 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2009.05.007· OSTI ID:21235983

Oehlschlaeger, Matthew A; Steinberg, Justin ^[1]; Westbrook, Charles K; Pitz, William J ^[2]

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1. Department of Mechanical, Aerospace, and Nuclear Engineering, Rensselaer Polytechnic Institute, 110 8th St., JEC 2049, Troy, NY 12180 (United States)
2. Lawrence Livermore National Laboratory, Livermore, CA (United States)

Iso-cetane (2,2,4,4,6,8,8-heptamethylnonane, C{sub 16}H{sub 34}) is a highly branched alkane reference compound for determining cetane ratings. It is also a candidate branched alkane representative in surrogate mixtures for diesel and jet fuels. Here new experiments and kinetic modeling results are presented for the autoignition of iso-cetane at elevated temperatures and pressures relevant to combustion in internal combustion engines. Ignition delay time measurements were made in reflected shock experiments in a heated shock tube for {phi} = 0.5, 1.0, and 1.5 iso-cetane/air mixtures at temperatures ranging from 879 to 1347 K and pressures from 8 to 47 atm. Ignition delay times were measured using electronically excited OH emission, monitored through the shock tube end wall, and piezoelectric pressure transducer measurements, made at side wall locations. A new kinetic mechanism for the description of the oxidation of iso-cetane is presented that is developed based on a previous mechanism for iso-octane. Computed results from the mechanism are found in good agreement with the experimental measurements. To our knowledge, the ignition time measurements for iso-cetane presented here are the first of their kind. (author)

• OSTI ID: 21235983
• Journal Information: Combustion and Flame, Vol. 156, Issue 11; Other Information: Elsevier Ltd. All rights reserved; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
33 ADVANCED PROPULSION SYSTEMS
AUTOIGNITION
ALKANES
COMBUSTION KINETICS
SHOCK TUBES
INTERNAL COMBUSTION ENGINES
SIMULATION
MIXTURES
AIR
TIME DELAY
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
PRESSURE RANGE KILO PA
PRESSURE RANGE MEGA PA 01-10
Kinetic modeling