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A model for the injection boundary conditions in the context of 3D simulation of Diesel Spray: Methodology and validation

机译：柴油机喷雾3D模拟中的喷射边界条件模型：方法论和验证

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摘要

Downstream Inflow Turbulent Boundary Conditions (DITurBC) are presented for the Eulerian-Eulerian Large Eddy Simulation (LES) or Reynolds Average Navier-Stokes (RANS) simulation of Diesel Sprays. These boundary conditions initiate the spray physics close to the nozzle exit, which avoids the difficulties linked to the 3D simulation of cavitation, primary break-up and turbulence in the near-nozzle region. An injector model is combined with mass and axial momentum conservation equations to obtain mean profiles of velocity, volume fraction and droplet diameter at a given distance downstream from the nozzle exit. In order to take into account the unsteadiness of the flow, velocity fluctuations are added to the mean profile. These boundary conditions are assessed by comparison with existing data on injection velocity, spray angle and velocity profiles from numerous experiments.
机译：介绍了柴油喷雾的下游流入湍流边界条件（DITurBC），用于欧拉-欧拉大涡模拟（LES）或雷诺平均纳维-斯托克斯（RANS）模拟。这些边界条件在靠近喷嘴出口处启动了喷雾物理过程，从而避免了与3D模拟在喷嘴附近区域发生气蚀，初次破裂和湍流有关的困难。喷射器模型与质量和轴向动量守恒方程相结合，以获得在喷嘴出口下游给定距离处的速度，体积分数和液滴直径的平均分布。为了考虑流动的不稳定性，将速度波动添加到平均轮廓中。这些边界条件是通过与众多实验中有关注射速度，喷雾角度和速度曲线的现有数据进行比较来评估的。

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