I214 Visualization of secondary atomization in emulsified fuel spray flame by magnified shadow imaging

Abstract

Secondary atomization of emulsified fuel in spray flame was visualized by magnified shadow imaging. An emulsified fuel spray was injected into a flame stabilized in a laminar counterflow field. Direct photography of the flame using a color high-speed video camera and magnified shadow imaging of spray droplets using a monochrome high-speed video camera were used. As a result, "blight spots" were observed in spray flame of the emulsified fuel, whereas it was rarely observed in spray flame of n-dodecane. Observations indicated that the droplet flame rapidly expanded. This expansion was linked to secondary atomization such as puffing and micro-explosion, which were visualized by magnified shadow imaging.