Abstract Liquid fuel atomization in transverse uniform gaseous flow, i.e., crossflow, is widely utilized in aircraft engines and is considered an important aspect for engine development. The atomization-evaporation process of liquid fuel jet spray in the vicinity of a nozzle in crossflows is investigated by a detailed numerical simulation using an Eulerian/Lagrangian framework. The Eulerian framework is applied for each gas or liquid continuum fluid phase, whereas the Lagrangian framework is applied for the dispersed droplets generated by the atomization process. To capture the gas-liquid interface with an accurate surface tension in the Eulerian framework, a coupled Levelset and volume-of-fluid (CLSVOF) method is used. The evaporation of Lagrangian droplets is considered by a non-equilibrium Langmuir-Knudsen evaporation model. The results show that the trends of the jet trajectory and primary breakup behavior of liquid column are well captured and in good agreements with the previous experimental and analytical studies. The aerodynamic Weber number significantly influences the primary breakup behavior and the vortex development and morphology behind the liquid column, which tends to drastically change the evaporation process as well.

中文翻译：

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横流中液体燃料射流的雾化和蒸发过程：使用欧拉/拉格朗日方法的数值研究

摘要 横向均匀气流中的液体燃料雾化，即横流，广泛应用于飞机发动机，被认为是发动机发展的一个重要方面。通过使用欧拉/拉格朗日框架的详细数值模拟，研究了在横流喷嘴附近液体燃料射流喷雾的雾化-蒸发过程。欧拉框架适用于每个气体或液体连续流体相，而拉格朗日框架适用于雾化过程产生的分散液滴。为了在欧拉框架中以精确的表面张力捕获气液界面，使用了耦合水平集和流体体积 (CLSVOF) 方法。拉格朗日液滴的蒸发由非平衡 Langmuir-Knudsen 蒸发模型考虑。结果表明，射流轨迹的趋势和液柱的初级破碎行为得到了很好的捕捉，并且与之前的实验和分析研究非常吻合。空气动力学韦伯数显着影响初级破碎行为以及液柱后面的涡流发展和形态，这也往往会极大地改变蒸发过程。