Original title: Numerical simulations of aeroelastic instabilities in turbine blade cascade by modified Van der Pol model at running excitation
Authors: Pešek, Luděk ; Šnábl, Pavel ; Prasad, Chandra Shekhar ; Delanney, Y.
Document type: Papers
Conference/Event: Computational mechanics 2022. Conference with international participation /37./, Srní (CZ), 20221107
Year: 2022
Language: eng
Abstract: Apart from rotary test rig for evaluation of structural dynamics of the bladed wheels, the control flutter experiments has been performed on the linear cascade model in the subsonic wind tunnel in the Institute of Thermomechanics, of CAS, in Prague. These experiments are aimed at stability evaluation of the cascade at running waves or at stability limit testing by flow speed changes or by force impulses of blades. The onset of flutter and its spreading in the cascade are observed, too. The linear cascade model consists of five NACA010 blades. All the blades can be separately excited with electromagnetic torque excitation mechanism and all of them are instrumented to measure the aerodynamic moments which can be used to calculate the aerodynamic work. A more details about the linear blade cascade experimental set up can be found in [1-2]. To predict a dynamic behaviour in the blade cascade, we have been dealing with simplified theoretical modelling of the aeroelastic instability in turbine blade cascade [3-5]. Due to the application of the reduced cascade model consisting of simple elements – springs, rigid bodies, linear dampers – and aeroelastic forces introduced by analytical Van der Pol model, it facilitates to study the dangerous states of vibration of such complicated turbine parts [6-9]. This study is aimed at examination of aeroelastic instabilities of 10-blade cascade at running excitation that arises due to the wakes flowing from stator the blades to the rotating blades. They cause forced excitation in the narrow frequency range.
Keywords: bladed wheels; rotary test; structural dynamics
Project no.: GA20-26779S (CEP)
Funding provider: GA ČR
Host item entry: COMPUTATIONAL MECHANICS 2022, ISBN 978-80-261-1116-0
Note: Související webová stránka: https://www.kme.zcu.cz/compmech/download/proceedings/CM2022_Conference_Proceedings.pdf#section*.36

Institution: Institute of Thermomechanics AS ČR (web)
Document availability information: Fulltext is available at the institute of the Academy of Sciences.
Original record: https://hdl.handle.net/11104/0340300

Permalink: http://www.nusl.cz/ntk/nusl-521014


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Research > Institutes ASCR > Institute of Thermomechanics
Conference materials > Papers