The effects of swirled inflows on the evaporation of dilute acetone droplets dispersed in turbulent jets are investigated by means of direct numerical simulation. The numerical framework is based on a hybrid Eulerian–Lagrangian approach and the point-droplet approximation. Phenomenological and statistical analyses of both phases are presented. An enhancement of the droplet vaporization rate with increasing swirl velocities is observed and discussed. The key physical drivers of this augmented evaporation, namely dry air entrainment and swirl-induced centrifugal forces acting on the droplets, are isolated with the aid of additional simulations in which the inertial properties of the droplets are neglected. The correlation between swirl and dry air entrainment rate is found to be responsible for the increase of the global evaporation rate and the spray penetration length reduction, while swirl-induced centrifugal forces are found to be effective only in the jet shear layer, close to the injection orifice, for the analyzed cases.

中文翻译：

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湍流旋流射流中稀喷雾蒸发的直接数值模拟

通过直接数值模拟研究了旋流对分散在湍流射流中的稀丙酮液滴蒸发的影响。数值框架基于混合欧拉-拉格朗日方法和点滴近似。介绍了两个阶段的现象学和统计分析。观察和讨论了随着涡流速度的增加液滴蒸发率的提高。这种增强蒸发的关键物理驱动因素，即干空气夹带和作用在液滴上的涡流引起的离心力，在忽略液滴惯性特性的附加模拟的帮助下被隔离。