For internal combustion engine, the determination of combustion characteristics and subsequent emissions formation relies heavily on the fuel injection process. With the increasing demand for enhanced fuel efficiency and reduced emissions, it becomes vital to develop fundamental understanding of physical process involved in the fuel injection process. In this study, an optimal numerical approach to predict high pressure liquid injection process in the context of industrial computations has been investigated. In particular, this study focuses on the respective performance of the Partially-Averaged Navier-Stokes and Large Eddy Simulation models to predict turbulent igniting sprays. Both approaches are coupled with widely used Lagrangian Discrete Droplet Method for spray modelling. The results are validated against well established ECN Spray A case in reactive and non reactive conditions. For reacting conditions, Flamelet Genrated Manifold (FGM) combustion model is employed in the present work. Comparative study and validation against experimental data showed that PANS turbulence model allows for coarser grids while still maintaining accurate results.

中文翻译：

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LES和PAN​​S方法的高压注液过程计算研究

对于内燃机来说，燃烧特性和随后排放形成的确定在很大程度上依赖于燃油喷射过程。随着对提高燃油效率和减少排放的需求不断增加，对燃油喷射过程中涉及的物理过程进行基本了解变得至关重要。在本研究中，研究了在工业计算背景下预测高压液体注入过程的最佳数值方法。特别是，本研究重点关注部分平均纳维-斯托克斯模型和大涡模拟模型在预测湍流点火喷雾方面的各自性能。这两种方法都与广泛使用的拉格朗日离散液滴法相结合进行喷雾建模。结果在反应性和非反应性条件下针对成熟的 ECN Spray A 案例进行了验证。对于反应条件，目前的工作采用小火焰生成歧管（FGM）燃烧模型。与实验数据的比较研究和验证表明，PANS 湍流模型允许使用更粗的网格，同时仍保持准确的结果。