Oxides of Nitrogen Emissions from a Burning Fuel Mist

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Abstract
An essentially monosized ambient temperature and pressure fuel mist in air was generated by vaporizing and then condensing n-dodecane in nitrogen gas and later adding oxygen. Drop size was determined from the Fraunhofer diffraction pattern produced by passing a light beam through the mist. Oxygen concentration in the air around the drops, overall air-fuel ratio and fuel burning rale were measured. Oxides of nitrogen from the laminar mist flames, expressed as an emission index—milligrams of NOx as NO per gram of fuel burned—ranged from 0.1 to 3 and increased rapidly as droplet size was varied from 6 to 20 μm, The rate of increase for sizes from 20 to 35 μm was less rapid. Heterogeneous burning, with visible centers of combustion in a non-luminous flame was observed for all drop sizes. Probe results showed NOx was formed in the thick flame zone. The NO2 /NOx mole ratio increased with drop size, reaching 0.99 for the drops of 35 μm diameter.

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