The paper describes results of propeller cavitation noise experiments in non-uniform wake fields. Two propellers different in design with respect to the dominant type of cavitation have been investigated. The experiments were carried out with a planning boat, designed for cavitation noise research. The boat operates on a lake under acoustical free field conditions. A small acoustic range with a suspended hydrophone is used for recording the radiated noise. The objective of these tests is to disclose the influence of propeller design and wake fields upon cavitation noise. Compared to uniform flows, the cavitation inception speed is lower, but the increase of noise with speed is less. Whether the noise intensity of a propeller exposed to bubble cavitation is higher than a propeller designed for sheet cavitation depends on characteristics of the non-uniform wake fields. Further the propeller exposed to sheet type cavitation exhibit a noisy form of cloud cavitation in wake areas which cause decreasing angle of attack on the propeller blades.
Model tests on noise characteristics of propeller cavitation in wake flow
Modellversuche über das Geräuschverhalten der Propellerkavitation in der Sogströmung
1989
8 Seiten, 17 Bilder, 10 Quellen
Conference paper
English
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