Flutter running waves in turbine blades cascade

0483823 - ÚT 2018 RIV PL eng A - Abstract
Půst, Ladislav - Pešek, Luděk - Byrtus, M.
Flutter running waves in turbine blades cascade.
Dynamical Systems theory and Applications - Abstracts. Lodž: Department of Automation, Biomechanics and Mechatronics, 2017 - (Awrejcewicz, J.). s. 342-342. ISBN 978-83-935312-3-3.
[DSTA 2017 “Dynamical Systems – Theory and Applications” /14./. 11.12.2017-12.12.2017, Lodž]
R&D Projects: GA ČR GA16-04546S
Institutional support: RVO:61388998
Keywords : turbine blades * running waves * flutter * aero-elastic excitations
OECD category: Applied mechanics

The existence of flutter running waves has been often observed at experimental investigation of turbine blades cascade. The presented paper is an attempt to explain origin and behavior of running flutter waves in the rotating blade cascade excited by steam flow from the stationary bladed disk. One of the possibly reasons for existence of running waves are the running periodic forces from steam wakes due to different numbers of blades of stationary and rotating wheels. On a computational model of turbine disk with 10 blades there are shown properties – velocities, directions and modes – of these forced running waves. Interaction of this kind of forced excitation with aero-elastic self-excitation – flutter – causes origin of flutter running waves. These flutter waves will be analyzed in the paper for several kinds and combinations of aero-elastic self-excitations.
Permanent Link: http://hdl.handle.net/11104/0279348