拉瓦尔喷管内射流凝结流动数值研究

The Eulerian dispersed phase method combining the flow governing equations, nucleation model and droplet growth model was adopted to clarify the influence of condensation on the flow field, and the influence of nozzle geometry and gas humidity on the condensation state. The models with nozzle radius ratio of 2, 3, 4, 5 and gas humidities of 10%, 30%, 50%, 70%, 90%, 100% were numerically simulated. The results showed that the influences of condensation effect no the flow field were obvious and the temperature of condensation flow field was higher than non-condensation condition because of the latent heat released by vapor condensation. With the increase of the nozzle radius ratio, the droplet radius at the exit of nozzle axis increased. The droplet appeared closer to the throat and the droplet radius at the exit of axis was larger with the increase of nozzle half angle. The relationship between gas humidity and droplet size was nonlinear, and the droplets appeared closer to throat with higher gas humidity.