Evaporation Investigation of Single Droplet in High Temperature Fuel Gas

To understand the movement and evaporation behavior of single droplet in high temperature fuel gas,a mathematical model was proposed by considering the gas-liquid two-phase coupling.The droplet diameter,velocity and average temperature during its evaporating process and the influence of the fuel gas temperature(1 530 K - 2 130 K) and velocity(30 m/s - 60 m/s) were analyzed.The numerical results show that both higher temperature and higher velocity of fuel gas can accelerate the evaporation of droplet.When the fuel gas temperature decreases continuously along the droplet movement direction,a critical droplet diameter for evaporation exists.The evaporation time shortens with the increasing gas velocity as the droplet diameter gets lower than the critical value.However,the trend is contrary to the droplet diameter beyond that value.In the present condition(the temperature of the fuel gas drops from 2 210 K to 1 090 K along 550 mm length),the critical value is 100 μm.The evaporation investigation of a single droplet provides a foundation for the research of spray evaporation in high temperature gas.