An experimental investigation of ethylene/O{sub 2}/diluent mixtures: Laminar flame speeds with preheat and ignition delays at high pressures

Journal Article · Thu May 15 04:00:00 EDT 2008 · Combustion and Flame

DOI:https://doi.org/10.1016/J.COMBUSTFLAME.2007.11.012· OSTI ID:21036806

Kumar, Kamal; Mittal, Gaurav; Sung, Chih-Jen ^[1]; Law, Chung K ^[2]

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1. Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH 44106 (United States)
2. Department of Mechanical and Aerospace Engineering, Princeton University, Princeton, NJ 08544 (United States)

The atmospheric pressure laminar flame speeds of premixed ethylene/O{sub 2}/N{sub 2} mixtures were experimentally measured over equivalence ratios ranging from 0.5 to 1.4 and mixture preheat temperatures varying from 298 to 470 K in a counterflow configuration. Ignition delay measurements were also conducted for ethylene/O{sub 2}/N{sub 2}/Ar mixtures using a rapid compression machine at compressed pressures from 15 to 50 bar and in the compressed temperature range from 850 to 1050 K. The experimental laminar flame speeds and ignition delays were then compared to the computed values using two existing chemical kinetic mechanisms. Results show that while the laminar flame speeds are reasonably predicted at room temperature conditions, the discrepancy becomes larger with increasing preheat temperature. A comparison of experimental and computational ignition delay times was also conducted and discussed. Sensitivity analysis further shows that the ignition delay is highly sensitive to the reactions of the vinyl radical with molecular oxygen. The reaction of ethylene with the HO{sub 2} radical was also found to be important for autoignition under the current experimental conditions. (author)

• OSTI ID: 21036806
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 3 Vol. 153; ISSN CBFMAO; ISSN 0010-2180
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ARGON
ATMOSPHERIC PRESSURE
AUTOIGNITION
COMBUSTION KINETICS
COMPARATIVE EVALUATIONS
COMPRESSION
COUNTERFLOW SYSTEMS
ETHYLENE
FLAME PROPAGATION
Ignition delay
LAMINAR FLAMES
MIXTURES
NITROGEN
OXYGEN
PRESSURE RANGE MEGA PA 01-10
Premixed combustion
SENSITIVITY ANALYSIS
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0273-0400 K
TEMPERATURE RANGE 0400-1000 K
TEMPERATURE RANGE 1000-4000 K
TIME DELAY
VELOCITY
VINYL RADICALS