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Acoustic Considerations in Tip Vortex Cavitation Inception

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The prediction of the conditions when cavitation will occur is an important problem in the design and operation of quiet pumps, hydraulic machines and ship propellers. This paper presents a theoretical analysis of the inception of tip vortex cavitation from elliptic planform hydrofoils. The noise spectrum from tip vortex noise is used to estimate the extent of the rollup of the tip vortex behind the hydrofoil. The acoustic approach results in a theoretical analysis which is in good agreement with tip vortex measurements from three elliptic hydrofoils with large aspect ratios of 4, 7 and 10.2

Zusammenfassung

Die Vorhersage der Bedingungen, unter denen Kavitation auftritt, ist ein wichtiges Problem bei der Konstruktion und dem Betrieb geräuschloser Pumpen, hydraulischer Maschinen und Schiffspropellern. In dieser Arbeit wird eine theoretische Untersuchung über den Einsatz der Kavitation an Spitzwirbeln von elliptischen “Hydrofoils” vorgestellt. Das Geräuschspektrum des Spitzwirbelgeräusches wird benutzt, um die Ausdehnung des Spitzwirbels hinter der Hydrofoil abzuschätzen. Die akustische Behandlung führt zu einer theoretischen Analyse, die in guter Übereinstimmung mit Wirbelmessungen an drei elliptischen Hydrofoils mit großem Aspektverhältnis, nämlich 4,7 und 10,2 stehen.

Sommaire

Prévoir les conditions d'apparition de la cavitation est un problème important de la conception et du fonctionnement de pompes silencieuses, de machines hydrauliques et d'hélices de bateaux. Cet article présente une analyse théorique de l'apparition de la cavitation de tourbillon d'extrémité créée par des hydrofoils elliptiques de forme plane. Le spectre du bruit émis par le tourbillon d' éxtremité permet d'évaluer l'étendue du développement du tourbillon derrière l'hydrofoil. L'approche acoustique se traduit par une analyse théorique qui est en bon accord avec les mesures de tourbillons faites sur trois hydrofoils elliptiques à rapports d'axes élevés: 4,7 et 10,2.
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Document Type: Research Article

Publication date: November 1, 1993

More about this publication?
  • Acta Acustica united with Acustica, published together with the European Acoustics Association (EAA), is an international, peer-reviewed journal on acoustics. It publishes original articles on all subjects in the field of acoustics, such as general linear acoustics, nonlinear acoustics, macrosonics, flow acoustics, atmospheric sound, underwater sound, ultrasonics, physical acoustics, structural acoustics, noise control, active control, environmental noise, building acoustics, room acoustics, acoustic materials, acoustic signal processing, computational and numerical acoustics, hearing, audiology and psychoacoustics, speech, musical acoustics, electroacoustics, auditory quality of systems. It reports on original scientific research in acoustics and on engineering applications. The journal considers scientific papers, technical and applied papers, book reviews, short communications, doctoral thesis abstracts, etc. In irregular intervals also special issues and review articles are published.
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