A 3D numerical study of water spray flash evaporation occurring in a positive-pressure saturated vapor environment is conducted. The spray is non-uniform with a Rosin-Rammler droplet size distribution. The characteristics of the flashing spray and vapor flow field are obtained by calculating within the Eulerian-Lagrangian framework. The spray undergoes violent evaporation and significant temperature reduction in the beginning within the vicinity of the nozzle exit. As the spray develops downstream, evaporation becomes moderate. Smaller droplets are found to distribute in the spray central region with a comparatively higher evaporation rate and larger velocity variation. Meanwhile, larger droplets evaporate at a lower speed but cover a wider range. The vapor flow field near the nozzle exit is featured by high velocity and high turbulence intensity. Two sets of vortices with different scales and directions are observed in the upper and lower parts of the chamber.

进行了在正压饱和蒸汽环境中发生的水雾闪蒸蒸发的3D数值研究。喷雾不均匀，具有Rosin-Rammler液滴尺寸分布。通过在欧拉-拉格朗日框架内进行计算，可以获得闪蒸和蒸汽流场的特征。喷雾在喷嘴出口附近开始时经历剧烈的蒸发并显着降低温度。随着喷雾向下游发展，蒸发变得适中。发现较小的液滴以相对较高的蒸发速率和较大的速度变化分布在喷雾中心区域。同时，较大的液滴以较低的速度蒸发，但覆盖范围较大。喷嘴出口附近的蒸气流场具有高速度和高湍流强度的特点。