An investigation of methanol and methanol blended sprays using laser scattering images

The characteristics of methanol and methanol blended (M85) sprays were inve stigated under atmospheric conditions at various temperatures, ranging from non-vaporizing to vaporizing ambient conditions (298 similar to 353 K). Fr om laser scattering images, the macroscopic characteristics of the spray, s uch as the spray tip penetration and the spray angle, were determined. Entr opy concept was introduced to represent homogeneity and PIV analysis was ad opted to determine the fluid dynamic information at each location of the sp ray. The correlation between entropy and vorticity strength enabled us to f ind their relations. The effect of ambient composition, mainly of viscous e ffect as affected by CO2 levels, was investigated using PIV and entropy ana lysis. Spray width and entropy value were found to tend to decrease at incr eased CO2 levels.