Results 201 to 210 of about 4,033,948 (250)

Windage and Axial Friction Losses of High Speed Generator

2003 International Joint Power Generation Conference, 2003
Air-cooled generators have been fulfilling a wide range of applications recently. Concurrent with a low cost target, the market demands high efficiency and high performance designs. Windage and friction losses, caused by rotor rotation and cooling gas flowing through the ventilation circuits, represents one of the largest loss components in air-cooled ...
openaire   +1 more source

Numerical and experimental study of windage power loss in high-speed double helical gears considering the influence of oil-air volume ratio

Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science
The influence of windage power loss becomes significant when the gears rotating in air-oil mist with high velocities. The windage power loss is resulted from pressure drag and viscosity drag of the fluid in gearbox. Moreover, the viscosity drag is highly
Lin Wang, Zekai Du, Boyuan Zhang, Hao Li
semanticscholar   +1 more source

CFD Analysis of Gear Windage Losses: Validation and Parametric Aerodynamic Studies

Journal of Fluids Engineering, 2011
A computational fluid dynamics (CFD) method has been applied to gear configurations with and without shrouding. The goals of this work have been to validate the numerical and modeling approaches used for these applications and to develop physical understanding of the aerodynamics of gear windage loss.
Matthew J. Hill, Robert F. Kunz, Richard B. Medvitz, Robert F. Handschuh, Lyle N. Long, Ralph W. Noack, Philip J. Morris   +6 more
openaire   +1 more source

Novel Rotor Shape of Switched Reluctance Motor for Windage Loss Reduction

INTERMAG 2006 - IEEE International Magnetics Conference, 2006
This paper presents a novel switched reluctance motor rotor shape which has ribs between the rotor salient poles on the rotor outer surface. The conventional switched reluctance motor and the proposed rotor shape which is an aerodynamically cylindrical rotor but magnetically same as a conventional rotor are presented. Using this rotor, the windage loss
S. Won, J. Ahn, K. Kim, S. Lim, J. Lee
openaire   +1 more source

Windage Loss Reduction of High-Speed SRM Using Rotor Magnetic Saturation

IEEE Transactions on Magnetics, 2008
This paper presents a new approach to reduce windage loss of switched reluctance motor (SRM) by changing the rotor shape. To predict the performance of improved SRM rotor, the parametric finite element analyses are needed to get inductance profiles of the proposed rotor shape.
null Sung Hong Won, null Jaehoon Choi, null Ju Lee   +2 more
openaire   +1 more source

Computational Fluid Dynamics Simulations of Windage Loss in a Spur Gear

Turbomachinery, 2018
Windage losses arise due to the viscous dissipation of air -oil mist flow driven by the rotating faces, sides of the gears in a gearbox. The windage losses can consume up to 3% of the transmitted power.
M. Aktas, M. Yavuz, A. Ersan
semanticscholar   +1 more source

Research on Windage Power Loss of Spur Gear Base on CFD

Applied Mechanics and Materials, 2012
The paper established three-dimensional Computational fluid dynamic (CFD) model of the oil-air mixture in the gearbox after meshing by ICEM CFD simulated the turbulence model by the CFD. The method of calculate the windage power loss (WPL) of the spur gear were put forward.
Ning Zhao, Qing Jian Jia
openaire   +1 more source

Control of Shroud Leakage Loss and Windage Torque in a Low-Pressure Turbine Stage

Volume 12B: Turbomachinery — Axial Flow Turbine Aerodynamics; Deposition, Erosion, Fouling, and Icing
As new aeroengine architectures move to larger diameter fans and rotors, the associated increase in weight will need to be counterbalanced by lighter, more compact, and more efficient low-pressure turbines (LPT).
Loizos Christodoulou, Zhihui Li, Stephen Ambrose, Richard J. Jefferson-Loveday, Richard Jackson, Gary D. Lock, C. Sangan, J. Scobie   +7 more
semanticscholar   +1 more source

Investigation of Rotor Structure Influence on the Windage Loss and Efficiency of FSPM Machine

European Conference on Cognitive Ergonomics, 2018
This paper focuses on the influence on the windage loss brought by different rotor structures of flux-switching permanent magnet machines. Ribs and shrouds are added to the salient pole rotor to reduce the windage loss.
Mingda Liu, W. Sixel, Hao Ding, B. Sarlioglu   +3 more
semanticscholar   +1 more source

On windage power loss reduction achieved by flanges

Forschung im Ingenieurwesen, 2021
Y. Marchesse, M. Ruzek, F. Ville, P. Velex   +3 more
openaire   +1 more source