Measured flame structure and kinetics in a fuel-rich ethylene flame

Journal Article · Fri May 01 04:00:00 EDT 1998 · Combustion and Flame

DOI:https://doi.org/10.1016/S0010-2180(97)00208-3· OSTI ID:619606

Bhargava, A; Westmoreland, P R ^[1]

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1. Univ. of Massachusetts, Amherst, MA (United States). Chemical Engineering Dept.

Molecular-beam mass spectrometry (MBMS) has been used to map the structure of a fuel-rich C{sub 2}H{sub 4}/O{sub 2} flame and infer new C{sub 2}H{sub 4} and C{sub 2}H{sub 3} kinetics. Axial profiles of concentration, area expansion ratio, and temperature were measured for a C{sub 2}H{sub 4}/O{sub 2}/50% Ar ({psi} = 1.90) flame at 2.667 {+-} 0.001 kPa (20 Torr) and 62.5 cm/s burner velocity (300 K). Full concentration profiles were mapped for 42 radical and stable species. Elemental flux balances were within 12%, supporting the data`s accuracy and validity. Species flux-balance calculations were used to obtain net rates of reaction for the species. Rate constants were determined for H-abstraction from C{sub 2}H{sub 4} by H at 1,850--2,150 K, and their agreement with theory and previous lower-temperature data leads to recommendation of the ab initio/BAC-MP4 result: C{sub 2}H{sub 4} + H = C{sub 2}H{sub 3} + H{sub 2}, k = 4.49 {times} 10{sup 7} {times} T{sup 2.12} exp({minus}13,366/RT) in cm, mol, s, cal, K units. Data for abstraction by OH, combined with literature data, give: C{sub 2}H{sub 4} + OH = C{sub 2}H{sub 3} + H{sub 2}O, k = (5.53 {+-} 0.14) {times} 10{sup 5} {times} T{sup (2.310 {+-} 0.004)} exp[{minus}(2,900 {+-} 60)/RT] for temperatures between 1,400 and 1,800 K. Rate constants for vinyl decomposition reaction C{sub 2}H{sub 3} = C{sub 2}H{sub 2} + H were analyzed, supporting the recent recommendations of Knyazev and Slagle.

• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: FG02-91ER14192
• OSTI ID: 619606
• Journal Information: Combustion and Flame, Journal Name: Combustion and Flame Journal Issue: 3 Vol. 113; ISSN 0010-2180; ISSN CBFMAO
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
CHEMICAL COMPOSITION
COMBUSTION KINETICS
ETHYLENE
FLAMES
MORPHOLOGY
VINYL RADICALS