The suppression of soot particle formation in laminar and turbulent diffusion flames

Conference · Thu Jan 01 04:00:00 EST 1987

OSTI ID:5212016

Kennedy, I M

A range of aliphatic hydrocarbon fuels have been burned on a porous cylindrical burner which was housed in a small wind tunnel. The approach flow velocity was adjusted so that the formation of particles was suppressed and the flame turned blue. This defined a critical velocity gradient for the stagnation point flame at which the soot inception chemistry of the flame could not cope with the rate of mixing of reactants imposed by the strain rate of the flow. Measurements of the fluoresence of polyaromatic species with an excimer pumped dye laser indicated that their formation rate in flames of the lightly sooting fuels such as ethane was very sensitive to the flow field. Fluoresence measurements in a heavily sooting fuel such as propene were not as sensitive to the velocity gradient of the flow. Measurements were made of the height to the onset of soot formation in vertical, turbulent diffusion flames of the same fuels. It was found that numerical calculations of the mean scalar dissipation rates at this location in a jet were in reasonably good agreement with the values which were derived from the laminar, counter-flow flame experiments.

• OSTI ID: 5212016
• Report Number(s): CONF-870484-
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
025000* -- Petroleum-- Combustion
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
AIR POLLUTION ABATEMENT
ALKENES
AROMATICS
BURNERS
COMBUSTION CONTROL
COMBUSTION PRODUCTS
CONTROL
DIFFUSION
EMISSION
EMISSION SPECTROSCOPY
FLAMES
FLUID FLOW
FLUORESCENCE
FLUORESCENCE SPECTROSCOPY
FUELS
HYDROCARBONS
INHIBITION
LAMINAR FLOW
LIQUID FUELS
LUMINESCENCE
ORGANIC COMPOUNDS
POLLUTION ABATEMENT
POLYCYCLIC AROMATIC HYDROCARBONS
PROPYLENE
SOOT
SPECTROSCOPY
THERMAL DIFFUSION