Results 181 to 190 of about 6,045 (208)

Windage loss reduction study for TFTR pulse generator

17th IEEE/NPSS Symposium Fusion Engineering (Cat. No.97CH36131), 2002
In PPPL's campaign to improve operating efficiency and reduce operating costs of our large vertical shaft motor generators proved to be a fruitful area. The measured losses in the stator air cooling loop were in the area of one megawatt. Reducing these losses was the focus of a recent study by PPPL and GE Hydro. Operating data was used to calculate the
M.N. Awad, W.J. Martin
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Windage Heating of Air Passing Through Labyrinth Seals

Volume 1: Turbomachinery, 1994
The viscous drag on rotating components in gas turbine engines represents both a direct loss of power from the cycle and an input of heat into the secondary (cooling) air system. Hotter cooling air in turn means increased flow requirements. The effects of windage on performance are therefore compounded. To facilitate accurate temperature
J. A. Millward, M. F. Edwards
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Evaluation of Windage Losses for High-Speed Disc Machinery

Proceedings of the Institution of Mechanical Engineers, Part A: Journal of Power and Energy, 1992
Design and development of experimental apparatus is detailed for stator drag torque measurement as well as a method to evaluate rotor windage losses directly from air mass flow and temperature changes. Effects of air jets at the rotor rim were also investigated.
M R Etemad, K Pullen, C B Besant, N Baines   +3 more
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Reducing Gear Windage Losses From High Speed Gears

Volume 6: 8th International Power Transmission and Gearing Conference, 2000
Abstract Windage losses in gearboxes account for a large portion of the total power loss in high-speed drive trains. Very little actual data has been collected specifically quantifying these losses. Traditional techniques to measure the effects of baffles in high speed gearing applications have been done by trial and error on very ...
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Windage Loss in Larger High-Speed Gears

Proceedings of the Institution of Mechanical Engineers, Part A: Power and Process Engineering, 1984
Some preliminary measurements have been made of the windage loss in a number of larger spur gears and one helical gear, in air, and of how this windage loss is affected by speed, size, details of the gear geometry and the shape of enclosures. It is shown that for most gears the larger part of the windage loss arises from the teeth.
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Study on Windage Yaw of Ceramic Suspension String

Applied Mechanics and Materials, 2013
The windage yaw of suspension string under dynamic wind was analyzed with the method of finite element (FEM). By using finite element software ABAQUS, the windage yaw angle of suspension string under gust and pulsating wind for 500kV high voltage transmission line was also computed and compared with the result calculated by traditional statics method ...
D.Q. Zhang, L.B. Jiang, C. Wang, Z.F. Yuan, G.C. Zhang, Yan Jin Guan   +5 more
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Leakage and Windage Heating in Stepped Labyrinth Seals

Volume 1: Compressors, Fans, and Pumps; Turbines; Heat Transfer; Structures and Dynamics, 2019
Abstract Stepped labyrinth seals are used in multiple locations in the gas turbine with the intent to reduced leakage compared to straight labyrinth seals. However the selection of geometric factors in stepped labyrinth seals is critical to allow lower leakage in its operating envelope.
Kali Charan Nayak, Nomesh P. Kandaswamy, Syed Faheemulla   +2 more
openaire   +1 more source

Windage Losses in High Speed Gears—Preliminary Experimental and Theoretical Results

Journal of Mechanical Design, 2003
Power losses in high-speed gears come from the friction between the teeth (sliding and rolling), the lubrication process (dip or jet lubrication), the pumping of a gas-lubricant mixture during the meshing and the losses associated with windage effects.
Diab, Youssef, Ville, Fabrice, Changenet, Christophe, Velex, Philippe   +3 more
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A Windage Power Loss Model for Spur Gear Pairs

Tribology Transactions, 2010
This article proposes a simplified fluid mechanics–based model to predict the windage power loss of a spur gear pair operating under jet lubrication conditions. In this model, the total windage power loss is defined as the sum of (a) the losses associated with the interactions of individual gears with the air or air–oil mixture and (b) the losses due ...
Satya Seetharaman, Ahmet Kahraman
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Windage power loss reductions in high-speed gear pairs

Forschung im Ingenieurwesen, 2019
This paper deals with recent experimental and numerical research in the possible reduction of windage power losses (WPL). It is accepted that these load-independent losses become prominent over other sources in mechanical transmissions with peripheral speeds above 100 m/s as is the case in energy production, aeronautics and electric vehicles.
M. Ruzek, Y. Marchesse, F. Ville, P. Velex   +3 more
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