SINGLE PHASE MODELLING OF AN AEROENGINE SPIRAL BEVEL GEAR USING A CONE AND MOMENTUM-SOURCE APPROACH

摘要

This paper presents a methodology to computationally model in single phase a spiral bevel gear and shroud using momentum sources. Previous work has shown that detailed modelling of flow behaviour, particularly windage power loss, for spiral bevel gears is too computationally expensive at present for any domain larger than a few teeth . Here, a significantly less computationally intensive modelling approach utilizing momentum sources is developed. In the momentum source model the complex gear-shroud geometry is replaced by a smooth cone with momentum sources used to generate the required flow behaviour at system or sub-system level. A geometrically detailed CFD model was created and used to calibrate the momentum source model. As reported here, the correct bulk axial, radial and azimuthal velocity components, as well as correct mass flow rates, can be generated by the momentum source model. A preliminary CFD model of a chamber containing a single rotating element has been developed and is also reported.