Investigation of Cavitation Noise in Cavitating Flows around an NACA0015 Hydrofoil

To provide theoretical basis for cavitation noise control, the cavitation evolution around a hydrofoil and its induced noise were numerically investigated. A modified turbulence model and Zwart cavitation model were employed to calculate the flow field and predict the cavitation phenomenon accuratel...

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Bibliographic Details
Published in:Applied sciences 2019-09, Vol.9 (18), p.3736
Main Authors: Yu, An, Wang, Xincheng, Zou, Zhipeng, Tang, Qinghong, Chen, Huixiang, Zhou, Daqing
Format: Article
Language:English
Subjects:
acoustic characteristic
Acoustics
Cavitation
cavitation noise
Cavitation number
Computational fluid dynamics
Hydraulic engineering
Hydrofoils
Investigations
Leading edges
NACA0015 hydrofoil
Noise
Numerical analysis
Spectra
Trailing vortices
Turbulence models
Viscosity
Vortices
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Summary:To provide theoretical basis for cavitation noise control, the cavitation evolution around a hydrofoil and its induced noise were numerically investigated. A modified turbulence model and Zwart cavitation model were employed to calculate the flow field and predict the cavitation phenomenon accurately. Then, the acoustic analogy method based on the Ffowcs Williams-Hawking (FW-H) equation was applied to analyze the cavitation-induced noise. Seven cavitation numbers were selected for analysis. Acoustic power spectral density (PSD) and acoustic pressure were investigated to establish the relationship between cavitation number and their acoustic characteristics. It was indicated that as cavitation number decreases, cavitation cycle length gets shorter and the magnitude of acoustic power spectral density increases dramatically. One peak value of acoustic power spectral density induced by the extending and retracting of leading-edge cavitation can be obtained under sheet cavitation conditions, while under cloud cavitation, two peak values of acoustic power spectral density can be obtained and are induced by superposition from leading-edge cavitation and trailing vortex.
ISSN:2076-3417
2076-3417
DOI:10.3390/app9183736