THERMAL SCIENCE

International Scientific Journal

INFLUENCE OF RUNNING CONDITIONS ON RESONANT OSCILLATIONS IN FRESH-AIR VENTILATOR BLADES USED IN THERMAL POWER PLANTS

ABSTRACT
High frequency cyclic load of fresh air supply to ventilator blades in thermo energetic facilities can cause the occurrence of fretting in the pressed overlap of ventilator shaft and socket. These loads can be generated by the resonant oscillations of ventilator blades and thermal residual stress due to welding. To prevent running in resonant conditions, the manufacturer of the ventilator defined a procedure of adjusting blades natural frequency in the process of production, as well as period control during exploitation period. The numerical simulations and the accelerations measured and presented in this paper, enabling analysis of mass changes and rotation rate effects on resonant oscillations occurrence in fresh air ventilator.
KEYWORDS
PAPER SUBMITTED: 2008-10-20
PAPER REVISED: 2008-11-01
PAPER ACCEPTED: 2009-02-11
DOI REFERENCE: https://doi.org/10.2298/TSCI0901139T
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2009, VOLUME 13, ISSUE 1, PAGES [139 - 146]
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© 2017 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence