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How far have we been? : —Summary of investigations on rotating cavity at IDG, RWTH Aachen University

Frontiers of Energy and Power Engineering in China : Volume 3, Issue 3, September 2009

Frontiers of Energy and Power Engineering in China : Volume 3, Issue 2, June 2009

Frontiers of Energy and Power Engineering in China : Volume 3, Issue 1, March 2009

Frontiers of Energy and Power Engineering in China : Volume 2

Frontiers of Energy and Power Engineering in China : Volume 1

How far have we been? : —Summary of investigations on rotating cavity at IDG, RWTH Aachen University

Content Provider	Springer Nature Link
Author	Bohn, Dieter Ren, Jing
Copyright Year	2009
Abstract	Annular cavities are found inside rotor shafts of turbomachines with an axial or radial throughflow of cooling air, which influences the thermal efficiency and system reliability of the gas turbines. The flow and heat transfer phenomena in those cavities should be investigated in order to minimize the thermal load and guarantee the system reliability. An experimental rig is set up in the Institute of Steam and Gas Turbines, RWTH Aachen University, to analyze the flow structure inside the rotating cavity with an axial throughflow of cooling air. The corresponding 3D numerical investigation is conducted with the in-house flow solver CHTflow, in which the Coriolis force and the buoyancy force are implemented in the time-dependent Navier-Stokes equations. Both the experimental and numerical results show that the whole flow structure rotating slower than the cavity rotating speed. The flow passing the observation windows in the experimental and numerical results indicates the quite similar trajectories. The computed sequences and periods of the vortex flow structure correspond closely with those observed in the experiment. Furthermore, the numerical analysis reveals a flow pattern changing between single pair, double pair, and triple pair vortices. It is suggested that the vortices inside the cavity are created by the gravitational buoyancy force in the investigated case, while the number and strength of the vortices are controlled mainly by the Coriolis force.
Starting Page	489
Ending Page	497
Page Count	9
File Format	PDF
ISSN	16737393
Journal	Frontiers of Energy and Power Engineering in China
Volume Number	3
Issue Number	4
e-ISSN	16737504
Language	English
Publisher	SP Higher Education Press
Publisher Date	2009-05-25
Publisher Institution	Chinese Universities
Publisher Place	Heidelberg
Access Restriction	Subscribed
Subject Keyword	rotating cavity buoyancy unsteady flow Energy Technology
Content Type	Text
Resource Type	Article
Subject	Energy Engineering and Power Technology

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