This paper presents results for modelling two-phase flows between a rotating spiral bevel gear and a static shroud. The context behind this is a desire to use Computational Fluid Dynamics (CFD) as a tool for reducing heat-to-oil within gas turbine bearing chambers and gearboxes. This paper uses a solid model and mesh technique first presented in [1], and extends it to include visualisation techniques for two-phase flows. A single tooth model of a spiral bevel gear is used with a Discrete Particle Model (DPM) approach to simulate the presence of oil within the domain using FLUENT 12.0.16. Two different injections are used; the inlet to the shroud simulates the ingestion of a suspended mist from the chamber in which a gear is sitting, and the outer diameter of the gear simulates shedding of oil from the rotating gear onto the surface of the shroud. Variation of the injection velocities allows parameterisation of the destination trajectories and locations of the particles. Analysis of the results of particles injected at the inlet to the shrouded gear show that larger droplets are likely to hit the underside of the nose to the shroud, whereas particles of around 3.5 microns diameter or smaller, will travel further into the domain and hit the gear, or pass entirely through the shrouded region. Droplets injected from the outer diameter of the gear show little sensitivity to the initial velocity and strike the surface of the shroud radially outwards from their injection location. This strong concentration of particles hitting the shroud will provide a useful avenue for further two-phase modelling using a thin-film created with the discrete particle model.

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