Results 161 to 170 of about 4,058 (217)

Windage Power Loss of High-Speed Generators

Advanced Energy Systems, 1997
Abstract Direct-drive electromachines that are designed to operate at higher rotating speeds will have a windage drag that is a more significant loss factor; this loss will require greater attention in the initial machine design. Switched-reluctance machines with poled rotors can further increase windage by fluid pumping and mixing ...
Edward B. Durkin, John J. Schauer
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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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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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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 Loss Models for Enclosed Cylindrical Flows Under S-CO2 Condition

Journal of Engineering for Gas Turbines and Power, 2023
Abstract A supercritical CO2 (S-CO2) Brayton cycle is expected to have high compactness, simple configuration, and competitive efficiency. These advantages originated from CO2 nonideal gas properties near the critical point. However, the strong real gas effect makes the design challenging.
Dokyu Kim, Yongju Jeong, In Woo Son, Jeong Ik Lee   +3 more
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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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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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On windage losses in high-speed pinion-gear pairs

Mechanism and Machine Theory, 2019
Abstract This article deals with the Windage Power Losses (WPL) of pinion-gear pairs rotating in air. The WPL of several disks, spur and helical gears have been measured using a dedicated test rig developed from a WPL measurement system initially used for one single pinion or disk.
Michal Ruzek, Fabrice Ville, Philippe Velex, Jean-Baptiste Boni, Yann Marchesse   +4 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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