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Experimental Study of a Low-Specific Speed Francis Model Runner during Resonance
Joint Authors
Agnalt, Einar
Solemslie, Bjørn W.
Dahlhaug, Ole G.
Østby, Petter
Source
Issue
Vol. 2018, Issue 2018 (31 Dec. 2018), pp.1-12, 12 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2018-12-23
Country of Publication
Egypt
No. of Pages
12
Main Subjects
Abstract EN
An analysis of the pressure in a runner channel of a low-specific speed Francis model runner during resonance is presented, which includes experiments and the development of a pressure model to estimate both the convective and acoustic pressure field from the measurements.
The pressure was measured with four pressure sensors mounted in the runner hub along one runner channel.
The mechanical excitation of the runner corresponded to the forced excitation from rotor-stator interaction.
The rotational speed was used to control the excitation frequency.
The measurements found a clear resonance peak in the pressure field excited by the second harmonic of the guide vane passing frequency.
From the developed pressure model, the eigenfrequency and damping were estimated.
The convective pressure field seems to diminish almost linearly from the inlet to outlet of the runner, while the acoustic pressure field had the highest amplitudes in the middle of the runner channel.
At resonance, the acoustic pressure clearly dominated over the convective pressure.
As the turbine geometry is available to the public, it provides an opportunity for the researchers to verify their codes at resonance conditions.
American Psychological Association (APA)
Agnalt, Einar& Østby, Petter& Solemslie, Bjørn W.& Dahlhaug, Ole G.. 2018. Experimental Study of a Low-Specific Speed Francis Model Runner during Resonance. Shock and Vibration،Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1215337
Modern Language Association (MLA)
Agnalt, Einar…[et al.]. Experimental Study of a Low-Specific Speed Francis Model Runner during Resonance. Shock and Vibration No. 2018 (2018), pp.1-12.
https://search.emarefa.net/detail/BIM-1215337
American Medical Association (AMA)
Agnalt, Einar& Østby, Petter& Solemslie, Bjørn W.& Dahlhaug, Ole G.. Experimental Study of a Low-Specific Speed Francis Model Runner during Resonance. Shock and Vibration. 2018. Vol. 2018, no. 2018, pp.1-12.
https://search.emarefa.net/detail/BIM-1215337
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-1215337