scholarly journals Visualization of whirlwind (non-stationary vortex) structures aimed to the improvement of cooling systems of electric power devices

2020 ◽  
Vol 12 (2) ◽  
Author(s):  
A.Yu. Varaksin ◽  
K.K. Denshchikov ◽  
M.V. Protasov ◽  
M.E. Romash
Keyword(s):  
Electric Power ◽  
Vortex Structures ◽  
Power Devices ◽  
Cooling Systems ◽  
Stationary Vortex

Stationary Vortex Structures in an Ideal Fluid

1998 ◽  
pp. 181-240
Author(s):  
V. K. Andreev ◽  
O. V. Kaptsov ◽  
V. V. Pukhnachov ◽  
A. A. Rodionov
Keyword(s):  
Ideal Fluid ◽  
Vortex Structures ◽  
Stationary Vortex

scholarly journals Reduction of heat sink common-mode currents in switching mode power supply circuits

2011 ◽  
Vol 9 ◽  
pp. 317-321 ◽  
Author(s):  
J. Kulanayagam ◽  
J. H. Hagmann ◽  
K. F. Hoffmann ◽  
S. Dickmann
Keyword(s):  
Electric Power ◽  
Power Supply ◽  
Heat Sink ◽  
Filter Design ◽  
Experimental Results ◽  
Power Devices ◽  
Common Mode ◽  
Switching Mode Power Supply ◽  
Switching Mode

Abstract. In this paper, a new filter design for a heat sink is presented. The parasitic couplings between electric power devices and the heat sink are responsible for common-mode currents. The main focus is on the reduction of these currents to reduce the heat sink radiation. For this purpose a new filter design is proposed. In addition, experimental results are shown to validate the proposed filter.

Polycrystalline HTS material for bearings and electric power devices

2001 ◽  
Vol 357-360 ◽  
pp. 843-851 ◽  
Author(s):  
F.N. Werfel ◽  
U. Flögel-Delor ◽  
R. Rothfeld ◽  
D. Wippich ◽  
T. Riedel
Keyword(s):  
Electric Power ◽  
Power Devices

Investigation of Stationary Vortex Structures in the Model Combustion Chamber

2012 ◽  
Vol 7 (2) ◽  
pp. 56-65
Author(s):  
Elizaveta Anokhina ◽  
Dmitriy Dekterev ◽  
Sergey Shtork ◽  
Sergey Alekseenko
Keyword(s):  
Combustion Chamber ◽  
Numerical Study ◽  
Turbulence Models ◽  
Vortex Structures ◽  
High Definition ◽  
Work Area ◽  
Commercial Package ◽  
Stationary Vortex ◽  
Vortex Combustion ◽  
Laser Light Source

This work focuses on experimental and numerical study of stationary vortex structures in a model of vortex combustion chamber of the tangential type. The experiments included the visualization of vortex structures in the work area using a laser light source and a digital high-definition cameras. The calculations were performed using a commercial package STAR-CCM +. From known turbulence models have been chosen the most suitable for the problem under investigation. In the calculations we obtained results that agree well with experimental data, which confirms the adequacy of employed numerical model

Potential Electric Power Applications for Magnesium Diboride

2001 ◽  
Vol 689 ◽  
Author(s):  
Paul M. Grant
Keyword(s):  
Critical Temperature ◽  
Electric Power ◽  
Magnesium Diboride ◽  
Commercial Production ◽  
Power Delivery ◽  
End User ◽  
Power Devices ◽  
Rapid Improvement ◽  
Substantial Progress ◽  
Critical State Parameters

ABSTRACTThe newly discovered superconductor, MgB2, has significant potential for a number of electric power applications, even though its critical temperature, TC, is “only” 39 K. In recent months, there has been rapid improvement in its critical state parameters, JC and H*, properties crucial to deployment in power devices, which now rival NbTi at 4.2 K, and equal or surpass many of the high temperature superconducting copper oxide perovskites in the 20 – 25 K range. Moreover, substantial progress has been achieved in realizing wire embodiments that appear economically scalable to commercial production. In this paper, we will review several opportunities to exploit these developments for transformer and electric cable applications, and hint at the possibility of a novel and visionary power delivery system centered on an MgB2-based dc cable cooled by gaseous or liquid hydrogen supplying both electrical and chemical energy to the end user.

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