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A Computational Investigation of Gear WindageA CFD method has been developed for application to gear windage aerodynamics. The goals of this research are to develop and validate numerical and modeling approaches for these systems, to develop physical understanding of the aerodynamics of gear windage loss, including the physics of loss mitigation strategies, and to propose and evaluate new approaches for minimizing loss. Absolute and relative frame CFD simulation, overset gridding, multiphase flow analysis, and sub-layer resolved turbulence modeling were brought to bear in achieving these goals. Several spur gear geometries were studied for which experimental data are available. Various shrouding configurations and free-spinning (no shroud) cases were studied. Comparisons are made with experimental data from the open literature, and data recently obtained in the NASA Glenn Research Center Gear Windage Test Facility. The results show good agreement with experiment. Interrogation of the validative and exploratory CFD results have led, for the first time, to a detailed understanding of the physical mechanisms of gear windage loss, and have led to newly proposed mitigation strategies whose effectiveness is computationally explored.
Document ID
20130000783
Document Type
Contractor Report (CR)
Authors
Hill, Matthew J. (Pennsylvania State Univ. Philadelphia, PA, United States)
Kunz, Robert F. (Pennsylvania State Univ. Philadelphia, PA, United States)
Date Acquired
August 27, 2013
Publication Date
December 1, 2012
Subject Category
Mechanical Engineering
Report/Patent Number
W911W6-06-2-0002
E-18542
NASA/CR-2012-217807
Funding Number(s)
WBS: WBS 877868.02.07.03.01.01.01
CONTRACT_GRANT: NNX07AB34A
CONTRACT_GRANT: NNC10CA35C
Distribution Limits
Public
Copyright
Public Use Permitted.

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