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    기술보고서 게시판 내용
    타이틀 A Computational Investigation of Gear Windage
    저자 Hill, Matthew J.;; Kunz, Robert F.
    Keyword COMPUTATIONAL FLUID DYNAMICS;; GEARS;; MATHEMATICAL MODELS;; MULTIPHASE FLOW;; SIMULATION;; TEST FACILITIES;; TURBULENCE MODELS
    URL http://hdl.handle.net/2060/20130000783
    보고서번호 NASA/CR-2012-217807
    발행년도 2012
    출처 NTRS (NASA Technical Report Server)
    ABSTRACT A 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.

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