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NO x formation in monodisperse fuel spray combustion
Journal article

NO x formation in monodisperse fuel spray combustion

A.A. Nizami and N.P. Cernansky
Symposium, International, on Combustion, v 17(1), pp 475-483
1979
DOI: https://doi.org/10.1016/S0082-0784(79)80048-X

Abstract

Experimental results are presented for the monodisperse fuel spray combustion of isopropanol in air. A vibrating orifice monodisperse aerosol generator supplied fuel to an aerodynamically stabilized atmospheric pressure flame in a combustion tube. Measurements were made over the full range of monodisperse operating conditions encompassing droplet diameters from 14–80 μ and equivalence ratios from 0.7 to 1.4. The data include exit plane measurements of NO and NO x , temperature profiles, and supporting emissions measurements of hydrocarbons, carbon monoxide, carbon dioxide, and oxygen. The experimental results indicate that the NO x formation in the spray combustion of isopropanol is affected by the droplet diameter, equivalence ratio, fuel feed rate and the distribution of dispersion and dilution air. The most significant effect is an observed change in NO and NO x with droplet diameter; both decrease with decreasing droplet diameter, reach a minimum around 50 microns, and then increase again to a fairly constant value. At an equivalence ratio of 1.39, a 61% reduction in NO x and 87.5% reduction in NO are observed from the maximum values recorded in the two respective modes. Possible mechanism explaining these NO x results are examined and discussed. It appears that the anomalous NO x behavior is associated with droplet interactions and the transition from a diffusive type of droplet/spray burning to that of a prevaporized and premixed case. Decreasing the droplet size results in a trend of increasing droplet interactions, which suppresses temperatures and reduces NO x . This trend continues until prevaporization and mixing effects begin to dominate and the system tends towards the premixed limit.

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