Scaling effects on cavitation noise.

H. Soyama, Y. Ito, R. Oba

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

Abstract

In order to clarify the scaling effects on cavitation noise, the acoustic power of the noise, the power spectra, and the corresponding cavitation characteristics for four similar flat-hydrofoils with chord length C from 53 mm to 160 mm was measured. The measurements were performed under similar conditions at the same flow velocity and at the same cavitation-nuclei size-distribution in test water. The scaling effects on the acoustic power I was determined to be a power law: I alpha Cn in the ultrasonic range in a wider cavitating range. The exponent n took the value 1.4 or 6.2, depending on the types of cavitation. The exponent 1.4 corresponded to the initiation state of fine-bubble- cavitation distributed spanwise within the laminar separation bubble near the leading edge, while the exponent 6.2 corresponded to a transient cavitating state accompanied with erosive bubble-clouds or vortex cavitation, "abrupt cavity separation", and shedding of large bubble clouds. (A)

Original languageEnglish
Title of host publicationINT. SYMP. ON CAVITATION NOISE AND EROSION IN FLUID SYSTEMS - 1989. PAPERS PRESENTED AT WINTER ANNUAL MEETING OF THE AMERICAN
PublisherNew York, U.S.A., American Society of Mechanical Engineers
Volume88 )
ISBN (Print)0791804232, 9780791804230
Publication statusPublished - 1989

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