Experimental characterization of 1-butanol electrospray combustion

An experimental investigation is presented on the combustion of bio-butanol electrosprays. Highresolution images were used to establish spray flame phenomenology and features such as shape, size, and stability of the spray flame. Phase Doppler Anemometry droplet size measurements were performed in both reacting and non-reacting electrosprays at several voltage and flow rate conditions. Analysis of the droplet sizing information revealed a bi-modal droplet size distribution. Evaporation time estimates were used to rationalize the results. Large droplets could pass through the flame without completely evaporating. Electrosprays of n-butanol were demonstrated to sustain flames stabilized with the assistance of electrostatics. Furthermore, these electrospray flames had characteristics substantially different from the spray flames of non-charged fuels.