Abstract
The composition of major stable species, including nitric oxide, and the temperature were measured within the diffusion flames around simulated ethanol droplets burning in air at atmospheric conditions. Nitric oxide measurements were also made with ethanol seeded with various percentages of a nitrogen containing compound (pyridine). The fuel droplet was simulated by a 1.2 mm porous carbon sphere supported by a fine stainless steel fuel line. Quartz microprobes, quartz coated thermocouples of platinum platinum-13% rhodium , a gas chromatograph, and a chemiluminescent analyzer were used. The results include documentation of significant oxygen penetration to the simulated droplet surface, and pyrolysis and partial oxidation of ethanol near the surface. The measured nitric oxide concentrations for both pure ethanol and pyridine seeded ethanol were greater than expected in spite of measured flame temperatures considerably lower than predicted.
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