Engineering Mechanics

International Conference

Proceedings Vol. 15 (2009)


ENGINEERING MECHANICS 2009

NATIONAL CONFERENCE WITH INTERNATIONAL PARTICIPATION
May 11 – 14, 2009, Svratka, Czech Republic
;
Editors: Jiří Náprstek and Cyril Fischer

Copyright © 2009 Institute of Theoretical and Applied Mechanics, Academy of Sciences of the Czech Republic, v.v.i., Prague

ISBN 978-80-86246-35-2 (printed, Extended Abstracts)
ISSN 1805-8248 (printed)
ISSN 1805-8256 (electronic)

list of papers scientific commitee

Stability of Q-Y characteristic of centrifugal pump
F. Pochylý, M. Haluza, S. Drábková
pages 989 - 996, full text

At the pumps of low specific speed it is possible, that near the point of Y zero discharge the Q-Y characteristic is unstable ( 0 ). This phenomenon of Q unstable Q-Y characteristic causes big pressures and discharge pulsations, which are characterized by self- excited oscillations of the systems. It is not recommended to run the pump between points of unstable characteristic. For this pump it is impossible to work in exacting operations (atomic power stations, heating plant stations, chemical industry). The stability conditions (Y, Q) are analyzed on the basis of dissipation function. It is assumed, that power input of the pump is linear function of the discharge. Governing equations are NavierStokes equations and continuity equation for incompressible fluid in modification in dependence on swirl velocity


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All papers were reviewed by members of the scientific committee.


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