High-speed water tunnels are typically used to investigate the single-phase and two-phase flows around hydrofoils for hydraulic machinery applications but their dynamic behavior is not usually evaluated. The modal analysis of an NACA0009 hydrofoil inside the test section was calculated with a coupled acoustic fluid–structure model, which shows a good agreement with the experimental results. This numerical model has been used to study the influence on the hydrofoil modes of vibration of the acoustic properties of the surrounding fluid and of the tunnel test section dimensions. It has been found that the natural frequencies of the acoustic domain are inversely proportional to the test section dimensions. Moreover, these acoustic frequencies decrease linearly with the reduction of the speed of sound in the fluid medium. However, the hydrofoil frequencies are not affected by the change of the speed of sound except when they match an acoustic frequency. If both mode shapes are similar, a strong coupling occurs and the hydrofoil vibration follows the linear reduction of natural frequency induced by the acoustic mode. If both mode shapes are dissimilar, a new mode appears whose frequency decreases linearly with speed of sound while keeping the acoustic mode of vibration. This new fluid–structure mode of vibration appears in between two hydrofoil structure modes and its evolution with sound speed reduction has been called “mode transition.” Overall, these findings reinforce the idea that fluid–structure interaction effects must be taken into account when studying the induced vibrations on hydrofoils inside water tunnels.
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October 2019
Research-Article
Numerical Investigation Into the Influence on Hydrofoil Vibrations of Water Tunnel Test Section Acoustic Modes
Wei Wang,
Wei Wang
College of Water Resources and Civil Engineering,
Beijing 100083,
e-mail: 1943459226@qq.com
China Agricultural University
,Beijing 100083,
China
e-mail: 1943459226@qq.com
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Lingjiu Zhou,
Lingjiu Zhou
1
College of Water Resources and Civil Engineering,
Beijing 100083,
China Agricultural University
,Beijing 100083,
China;
Beijing Engineering Research Centre of Safety and Energy Saving Technology for Water Supply Network System,
Beijing 100083,
e-mail: zlj@cau.edu.cn
Beijing 100083,
China
e-mail: zlj@cau.edu.cn
1Corresponding author.
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Zhengwei Wang,
Zhengwei Wang
Department of Thermal Engineering,
Beijing 100084,
e-mail: wzw@mail.tsinghua.edu.cn
Tsinghua University
,Beijing 100084,
China
e-mail: wzw@mail.tsinghua.edu.cn
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Xavier Escaler,
Xavier Escaler
Department of Fluid Mechanics,
Barcelona 08028,
e-mail: xavier.escaler@upc.edu
Universitat Politècnica de Catalunya-Barcelona Tech
,Barcelona 08028,
Spain
e-mail: xavier.escaler@upc.edu
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Oscar De La Torre
Oscar De La Torre
School of Marine Science and Engineering,
Plymouth PL4 8AA,
e-mail: oscar.delatorre@plymouth.ac.uk
Plymouth University
,Plymouth PL4 8AA,
UK
e-mail: oscar.delatorre@plymouth.ac.uk
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Wei Wang
College of Water Resources and Civil Engineering,
Beijing 100083,
e-mail: 1943459226@qq.com
China Agricultural University
,Beijing 100083,
China
e-mail: 1943459226@qq.com
Lingjiu Zhou
College of Water Resources and Civil Engineering,
Beijing 100083,
China Agricultural University
,Beijing 100083,
China;
Beijing Engineering Research Centre of Safety and Energy Saving Technology for Water Supply Network System,
Beijing 100083,
e-mail: zlj@cau.edu.cn
Beijing 100083,
China
e-mail: zlj@cau.edu.cn
Zhengwei Wang
Department of Thermal Engineering,
Beijing 100084,
e-mail: wzw@mail.tsinghua.edu.cn
Tsinghua University
,Beijing 100084,
China
e-mail: wzw@mail.tsinghua.edu.cn
Xavier Escaler
Department of Fluid Mechanics,
Barcelona 08028,
e-mail: xavier.escaler@upc.edu
Universitat Politècnica de Catalunya-Barcelona Tech
,Barcelona 08028,
Spain
e-mail: xavier.escaler@upc.edu
Oscar De La Torre
School of Marine Science and Engineering,
Plymouth PL4 8AA,
e-mail: oscar.delatorre@plymouth.ac.uk
Plymouth University
,Plymouth PL4 8AA,
UK
e-mail: oscar.delatorre@plymouth.ac.uk
1Corresponding author.
Contributed by the Noise Control and Acoustics Division of ASME for publication in the Journal of Vibration and Acoustics. Manuscript received September 14, 2018; final manuscript received May 22, 2019; published online June 17, 2019. Assoc. Editor: Sheryl M. Grace.
J. Vib. Acoust. Oct 2019, 141(5): 051015 (8 pages)
Published Online: June 17, 2019
Article history
Received:
September 14, 2018
Revision Received:
May 22, 2019
Accepted:
May 28, 2019
Citation
Wang, W., Zhou, L., Wang, Z., Escaler, X., and De La Torre, O. (June 17, 2019). "Numerical Investigation Into the Influence on Hydrofoil Vibrations of Water Tunnel Test Section Acoustic Modes." ASME. J. Vib. Acoust. October 2019; 141(5): 051015. https://doi.org/10.1115/1.4043944
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