The use of Computational Fluid Dynamics (CFD) is now central to the design process of aero-engine combustors, enabling optimal, safe and stable operation, increased efficiencies, and the reduction of pollutant emission. To benefit maximally from the use of CFD it is essential to account for the relevant physical phenomena, in particular the fuel spray breakup and its evaporation. Different strategies for modelling the injection of fuel spray are applied - in the simplest approach the fuel is assumed to be gaseous upon injection, in the most advanced approach the fuel is modelled, using a Lagrangian-Eulerian approach, as a liquid spray which breaks up, evaporates and eventually burns inside the combustion chamber. The effects of the various modelling strategies on the flow, temperature, and compositional fields are investigated. The radial distribution of the simulated temperature field is compared to experimental data, demonstrating that acceptable accuracy is only achieved when the fuel is modelled as a liquid spray and a two-way momentum coupling between the spray and the gas-phase is accounted for.

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带有甩油系统的航空发动机燃烧室的仿真与分析

现在，计算流体动力学（CFD）的使用对于航空发动机燃烧器的设计过程至关重要，可实现最佳，安全和稳定的运行，提高的效率并减少污染物排放。为了从CFD的使用中获得最大收益，必须考虑到相关的物理现象，尤其是燃油喷雾破裂及其蒸发。应用了不同的策略来模拟燃油喷雾的喷射-在最简单的方法中，假定燃油在喷射时为气态，在最先进的方法中，使用拉格朗日-欧拉方法对燃料进行建模，将其分解为液体喷雾蒸发并最终在燃烧室内燃烧。研究了各种建模策略对流动，温度和成分场的影响。