Abstract
A model is developed which describes the phase-change process (evaporation) of fuel droplets in a gas turbine engine combustor. To develop this model we have employed the conservation laws (droplet momentum, heat and mass transfer). Specifically, we used Newton's second law of motion in conjunction with the thermal expansion of the droplet. In this study the droplet density is considered to be a function of temperature, ρ p = ρ p (T p ). As a consequence, the thermal expansivity α = -ρ p -1 (dρ p /dT p ) is introduced, which has a significant effect on the evaporation process. Furthermore, the conditions on the droplet's surface are determined by taking into account the effect of surface tension on the fuel vapor pressure. The droplet characteristics such as position, velocity, temperature, and diameter are described by a system of six ordinary differential equations, which are solved numerically using a variable step Runge-Kutta algorithm of order 5(4). Due to the above conditions, our results differ from those reported in the literature [1-5J.
Published Version
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