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Numerical prediction of windage power losses for a spur gear in two phase media

DOI: 10.1615/THMT-18.930
pages 877-881

Murat K. Aktas
Department of Mechanical Engineering and Mechanics, Drexel University 3141 Chestnut Street, Philadelphia, PA19104 USA; Department of Mechanical Engineering TOBB University of Economics and Technology, 06560 Ankara, Turkey

A.K. Ersan
TAI Turkish Aerospace Industries, Havacilik Bulvari 17, 06980 Kahramankazan, Ankara, Turkey

M.A. Yavuz
TAI Turkish Aerospace Industries, Havacilik Bulvari 17, 06980 Kahramankazan, Ankara, Turkey


Windage losses arise due to viscous dissipation of air - oil mist flow driven by the rotating faces, sides of the gears in a gearbox. In the open literature, theoretical investigations mostly focused on the single phase (air) flow. Thus there is research need for the analysis of the windage losses under more realistic conditions. In the present study we attempt to elucidate the complex flow physics between the gears by considering the effects of oil particles in the highly turbulent air flow. The goals of this work is to develop physical understanding of the aerodynamics of gear windage loss. A spur gear geometry was considered, for which experimental and theoretical data are available. A commercial Computational Fluid Dynamics algorithm (CFD++) was utilized for the numerical simulations.Various shrouding configurations and free spinning cases are studied at different rotation speeds of the gear. The effects of the oil droplets on the windage losses were quantified.

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