Constructal design of gas-cooled electric power generators, self-pumping and atmospheric circulation

Bejan, A

Lorente, S

Lee, J

Kim, Y

2017-08-09T15:54:18Z

2017-08-09T15:54:18Z

2015-08-24

© 2015 Elsevier Ltd. All rights reserved. Rotating electric machines generate heat volumetrically, and are cooled by forced convection aided by the self-pumping effect. In this paper we focus on the fundamental relationship between the internal flow architecture of the gas cooled winding and its thermal performance, which is represented by the nearly uniform distribution of peak temperature throughout the winding volume. We show that the cooling passages can be sized such that the volumetric cooling is most effective. From this finding follows the number of passages and their distribution through the heat generating volume. The principle is developed analytically, and it is then validated based on numerical simulations of the cooling architecture. The paper also reports the thermodynamics basis of the self-pumping effect, and its natural occurrence as free convection in general, which includes atmospheric circulation.

0017-9310

https://hdl.handle.net/10161/15203

Elsevier BV

International Journal of Heat and Mass Transfer

10.1016/j.ijheatmasstransfer.2015.07.015

Constructal design of gas-cooled electric power generators, self-pumping and atmospheric circulation

Journal article

647

655

Duke

Mechanical Engineering and Materials Science

Pratt School of Engineering

Published

91