Optical background emission and structure in fuel/air flames seeded with diethyl sulfide, (C{sub 2}H{sub 5}){sub 2}S

Conference · Tue Dec 31 04:00:00 EST 1996

OSTI ID:492255

Fay, T D; Fay, A K ^[1]; Trees, D; Seshadri, K; Lund, K ^[2]

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1. PHI Applied Physical Sciences, Mission Viejo, CA (United States)
2. Univ. of California, San Diego, La Jolla, CA (United States)

The future need of safe disposal of chemical warfare agents and the increasing use of sulfur rich fuels make a quantitative understanding of the chemical reactions of sulfur containing compounds and their monitoring necessary. This report describes observations of the spectral emissions from the combustion of two different diffusion flames in a Seshadri type counterflow burner. These CH{sub 4}/air and H{sub 2}/air diffusion flames show almost identical flame structures in filtered CID camera and unfiltered color film pictures. Both display techniques show a single flame structure which is brightest in the near infrared. This structure exists as a thin band on the air inlet side of the burner close to the stagnation region. The location and spectral dependence of this radiation suggests spontaneous emission from vibration/rotation bands of the OH. To explore the effects of sulfur containing hydrocarbons on the flame, diethyl sulfide (DES) was added to the inlet air stream. The sulfur containing flames show the same emission bands as the unseeded flames with significant increases in spectral emission with increasing concentration of DES in the oxidizer. As the mole fraction of DES in air is increased from 0.3% to 2.0%, four new spectral bands successively appear. Each of these thin bands radiates in the blue. A single thin band close to the stagnation region increases with the DES mole fraction and may be due to SH or SH{sub 2} emissions. Radiation from the other three thin layers all increase with increasing DES concentration. Consequently, they may be typical sulfur combustion products, such as CS, CS{sub 2} or SO{sub 2}. At selected DES concentrations, a bright red band appears, possibly S{sub 2} emission.

• OSTI ID: 492255
• Report Number(s): CONF-960848--; ISBN 0-8194-2223-1
• Country of Publication: United States
• Language: English

Related Subjects

45 MILITARY TECHNOLOGY, WEAPONRY, AND NATIONAL DEFENSE
CHEMICAL WARFARE AGENTS
COCOMBUSTION
COMBUSTION KINETICS
EMISSION SPECTRA
FLAMES
HYDROGEN FUELS
METHANE
MORPHOLOGY
ORGANIC SULFUR COMPOUNDS
WASTE DISPOSAL