Change search
ReferencesLink to record
Permanent link

Direct link
Impact of the Flow on an Acoustic Excitation System for Aeroelastic Studies
Show others and affiliations
2013 (English)In: Journal of turbomachinery, ISSN 0889-504X, Vol. 135, no 3, 031033- p.Article in journal (Refereed) Published
Abstract [en]

The flow in turbomachines is highly unsteady. Effects like vortices, flow separation, and shocks are an inevitable part of the turbomachinery flow. Furthermore, high blade aspect ratios, aerodynamically highly loaded and thin profiles increase the blade sensitivity to vibrations. According to the importance of aeroelasticity in turbomachines, new strategies for experimental studies in rotating machines must be developed. A basic requirement for aeroelastic research in rotating machines is to be able to excite the rotor blades in a defined manner. Approaches for active blade excitation in running machines may be piezoelectric elements, magnetism, or acoustics. Contact-free excitation methods are preferred, since additional mistuning is brought into the investigated system otherwise. A very promising method for aeroelastic research is the noncontact acoustic excitation method. In this paper, investigations on the influence of an annular cascade flow on the blade vibration, excited by an acoustic excitation system, are presented for the first time. These investigations are carried out at the Aeroelastic Test Rig of the Royal Institute of Technology in Stockholm. By varying the excitation angle, the outlet Mach number, and the relative position of the excited blade to the excitation system, the influence of the flow on the acoustic excitation is quantified. The results show that there is a strong dependency of the excited vibration amplitude on the excitation angle if the outlet Mach number is increased, which implies that preferable excitation directions exist. Furthermore, it is shown that a benefit up to 23% in terms of excited vibration amplitude can be reached if the flow velocity is raised.

Place, publisher, year, edition, pages
2013. Vol. 135, no 3, 031033- p.
Keyword [en]
Acoustic excitation, Excitation methods, Excited vibrations, Experimental studies, Piezoelectric elements, Relative positions, Royal Institute of Technology, Turbomachinery flows
National Category
Mechanical Engineering
URN: urn:nbn:se:kth:diva-133977DOI: 10.1115/1.4007511ISI: 000326021300033ScopusID: 2-s2.0-84888017718OAI: diva2:664227

QC 20131114

Available from: 2013-11-14 Created: 2013-11-14 Last updated: 2013-11-14Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Vogt, Damian M.
By organisation
Biomedical and X-ray Physics
In the same journal
Journal of turbomachinery
Mechanical Engineering

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 41 hits
ReferencesLink to record
Permanent link

Direct link