To reduce fuel consumption of aeroengines, gearing of engines has become a trend. In geared engines, a design based on the elucidation of phenomena is necessary to achieve both high efficiency and reliability. Therefore, computational fluid dynamics (CFD) can contribute effectively to optimize its design. However, to our knowledge, examples of numerical simulation of high-speed gas-liquid two-phase flow in a planetary gear system, including multiple gear meshes and structures for oil capture, are not available in literature.

Therefore, in this study, a numerical simulation method, previously developed by our research team, was used for a planetary gear system. The key feature of our numerical simulation method is that it realizes fast and numerically stable calculations by using the volume of fluid (VOF) method and surface compression scheme for the air-liquid interface, and the porosity method for the object boundary.

To validate the accuracy of the numerical simulation method used, a planetary gear system with specifications equivalent to those of an aeroengine gear system was used. The numerical simulation and experimental test results obtained were then compared for fluid dynamic loss and oil capture flow rate. From this comparison, it was confirmed that the numerical simulation method used has a practically acceptable accuracy.

The effects of the shape of the oil capture structure on the fluid dynamic loss and oil capture flow rate were investigated using our numerical simulation. The relationship between air flow, oil flow, and fluid dynamic loss, as well as the relationship with the oil capture flow rate were then discussed.

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