SIZE AND HYDRATION CHARACTERISTICS OF LABORATORY SIMULATED JET ENGINE COMBUSTION AEROSOLS

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Abstract
Size and hydration characteristics for laboratory simulated jet engine combustion aerosols are reported and the validity of these simulated data is discussed. The jet fuels JP4, JP5, JP8 and JET A were burned in laboratory burners designed to simulate the lean pre-mixed, pre-vaporized advanced combustor concept. Significant quantities of aerosols were detected and in most cases their size and hydration properties were similar. Dry particle size distributions were single mode extending over the diameter range 0.014 to 0.200 microns, with peak diameters in the range 0.020 to 0.050 microns. The distributions were observed to vary with combustion stoichiometry, increasing the peak particle diameter as the combustion stoichiometry shifted from leaner to richer conditions. Critical supersaturation spectra for each fuel are presented. A mean ratio of cloud condensation nuclei to condensation nuclei (CCN/CH) has been calculate for each fuel: JP4 = 32%, JP5 = 42%, JET A = 39%, and JP8 = 35% indicating that in general 30 – 40% of the combustion aerosols generated with these laboratory burners can be considered cloud condensation nuclei.