Print Email Facebook Twitter Cavitation tunnel analysis of radiated sound from the resonance of a propeller tip vortex cavity Title Cavitation tunnel analysis of radiated sound from the resonance of a propeller tip vortex cavity Author Pennings, P.C. Westerweel, J. Van Terwisga, T.J.C. Faculty Mechanical, Maritime and Materials Engineering Department Marine and Transport Technology Date 2016-03-18 Abstract The goal of this study is to test the hypothesis that the resonance of a tip vortex cavity is responsible for high-amplitude broadband pressure-fluctuations, typically between 40 and 70 Hz,Hz, for a full scale propeller. This is achieved with a model propeller in a cavitation tunnel. Simultaneous high-speed video shadowgraphy and sound measurements show that a steady tip-vortex cavity behind a propeller in a uniform inflow does not produce significant sound in the relevant range of 0.5–1.2 kHzkHz. The addition of an upstream wake does result in high amplitude sound. It appears that the dominant sound frequency is directly related to the resonance of the tip vortex cavity. A model for the tip-vortex cavity-resonance frequency, using a Proctor vortex model, is able to give an accurate description of the dominant sound frequencies. Subject cavitationhydrodynamic noisepropellervortex dynamics To reference this document use: http://resolver.tudelft.nl/uuid:b778ef55-39ad-494d-a6ce-e3906f019748 Publisher Elsevier ISSN 0301-9322 Source https://doi.org/10.1016/j.ijmultiphaseflow.2016.03.004 Source International Journal of Multiphase Flow, 83, 2016 Part of collection Institutional Repository Document type journal article Rights © 2016 The AuthorsThis is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/) Files PDF 330456.pdf 3.88 MB Close viewer /islandora/object/uuid:b778ef55-39ad-494d-a6ce-e3906f019748/datastream/OBJ/view