Vaporization and combustion of liquid spray in a cylindrical shape combustor were studied numerically. In model calculation, mixture of liquid drops and air was assumed to be ejected from the center-hole and the assisting air from the concentric annulus with swirling. Eulerian-Lagrangian scheme was adopted for the two phase calculations, and the interactions between the phases were considered with PSIC model. Also adopted were the infinite conductivity model for drop vaporization, the eddy break-up model for reaction rate, and k-ε model turbulence calculations. Gas flow patterns, drop trajectories and contours of temperature and mass fractions of the gas species were predicted with the swirl number, drop diameter, and the equivalence ratio taken as parameters. Calculations show that the vaporization and the consequent combustion efficiency enhance with the increase of the swirl number and/or with the decrease of the drop size, and the higher maximum temperature is attained with the higher equivalence ratio.
