In order to study the separation characteristics of the aeroengine dynamic pressure oil-air separator, this paper uses the coupling method of PBM and CFD two-fluid model to study the influencing factors such as cylinder diameter, cylinder length, and other factors on the separator performance. The flow field structure, velocity, gas volume distribution, separation efficiency, and gas and liquid holdup rate in the separator under different operating conditions are analyzed. Combined with the analysis results of the cylinder diameter and the cylinder length, the influence law of length-diameter ratio on separation efficiency is summarized. The optimum length-to-diameter ratio that maximizes the separation performance of the separator is obtained in this research, which provides a reference for the design and improvement of the separator. The results show that, as the diameter of the cylinder increases, the separation efficiency increases first and then decreases. When d_sep = 16 mm and d_sep = 18 mm, the separator reaches its maximum efficiency, which is about 93%. With the increase of the cylinder length, the separation efficiency first increases and reaches the maximum when l₂ = 90 mm and then decreases slowly. When the separator cylinder is either too long or too short, it will cause the separation performance to decrease. There is an optimal aspect ratio. There is an optimal aspect ratio, and the separation performance of the separator is the best when the aspect ratio is between 5 and 6.

中文翻译：

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长径比对动压油气分离器性能影响的数值研究

为研究航空发动机动压油气分离器的分离特性，本文采用PBM与CFD双流体模型的耦​​合方法，研究影响分离器的气缸直径、气缸长度等因素。表现。分析了不同工况下分离器的流场结构、流速、气体体积分布、分离效率、气液截留率。结合筒径和筒长的分析结果，总结了长径比对分离效率的影响规律。本研究得到了使分离器分离性能最大化的最佳长径比，为分离器的设计和改进提供了参考。结果表明，随着圆筒直径的增大，分离效率先增大后减小。什么时候d _sep  = 16 mm 和d _sep  = 18 mm，分离器达到最大效率，约为 93%。随着筒体长度的增加，分离效率先增加，在l ₂  = 90 mm时达到最大值，然后缓慢下降。分离筒过长或过短都会导致分离性能下降。有一个最佳的纵横比。有一个最佳的纵横比，纵横比在5～6之间时隔板的分离性能最好。