The temporal development of OH-concentration profiles in ignition kernels studied by single-pulse laser induced fluorescence

Journal Article · Sat Feb 01 04:00:00 EST 1986 · Combust. Flame; (United States)

DOI:https://doi.org/10.1016/0010-2180(86)90127-6· OSTI ID:5907894

Bergland, T; Sunner, J

A frequency doubled dye laser has been used to excite fluorescence from OH-radicals in an ignition kernel in an atmospheric methane/air mixture. The fluorescence was imaged onto a gated and intensified diode array camera. Radial profiles with a spatial resolution of 0.05 mm were obtained from 10 ..mu..s to 3 ms after the spark. A transistorized coil ignition unit was used. The OH-concentration profiles grew smoothly during the first ms of the glow discharge phase. Due to the low energy in the initial breakdown the OH-profiles were not distorted by a spark channel and shock wave. At about 1 ms the flame front was seen to separate from the continuing glow discharge. The influence of the gas mixture stoichiometry on the OH-profiles was studied.

• Research Organization: Applied Physics, Technical Development, Volvo AB, S-405 08 Gothenburg
• OSTI ID: 5907894
• Journal Information: Combust. Flame; (United States), Journal Name: Combust. Flame; (United States) Vol. 63:1-2; ISSN CBFMA
• Country of Publication: United States
• Language: English

Related Subjects

03 NATURAL GAS
034000* -- Natural Gas-- Combustion
AIR
ALKANES
CAMERAS
DISPERSIONS
DYE LASERS
ELECTRIC DISCHARGES
ELECTRIC SPARKS
EMISSION SPECTROSCOPY
FLAME PROPAGATION
FLUIDS
FLUORESCENCE SPECTROSCOPY
GASES
GLOW DISCHARGES
HYDROCARBONS
HYDROGEN COMPOUNDS
HYDROXIDES
IGNITION
IGNITION SYSTEMS
IMAGE PROCESSING
LASER SPECTROSCOPY
LASERS
LIQUID LASERS
METHANE
MIXTURES
ORGANIC COMPOUNDS
OXYGEN COMPOUNDS
PROCESSING
QUANTITY RATIO
RESOLUTION
SHOCK WAVES
SPATIAL RESOLUTION
SPECTROSCOPY
STOICHIOMETRY