Sound field properties of non-cavitating marine propellers

The sound field properties of non-cavitating marine propellers are investigated using a hybrid method, in which the FWH (Ffowcs William-Hawkings) analogy is coupled with the BEM (Boundary Element Method) approach. The investigations include both the uniform and non-uniform inflow conditions. For both conditions, the dominant sound source terms and the decay rate of the noise with regard to the distance to propeller centre are investigated. The influence of the permeable surface dimensions in the permeable FWH approach on the hydroacoustic result is also investigated. To carry out the investigations, the formulation to calculate acoustic pressure generated by the propeller wake sheet is proposed for the first time. The issues associated to coupling permeable FWH approach and BEM are also discussed, including the fictitious volume flux problem and the consideration of the ship wake field. It was found that the influence of the permeable surface dimension is little for the 1st BPF (Blade Passage Frequency), but cannot be ignored for the 3rd BPF. In the uniform inflow situation the thickness terms are found to be dominant, while in the non-uniform inflow situation the loading terms are dominant.

Subjects

underwater radiated noise

propeller

Ffowcs Williams-Hawkings

permeable FWH

BEM

DDC Class

600: Technik

620: Ingenieurwissenschaften

Funding(s)

Effiziente Methoden zur Bestimmung der vom Propeller induzierten hydroakustischen Abstrahlung

More Funding Information

Deutschland, Bundesministerium für Wirtschaft und Energie

Publication version

publishedVersion

Lizenz

https://creativecommons.org/licenses/by/4.0/

Name

jmse-08-00885.pdf

Size

1.6 MB

Format

Adobe PDF

Options

Sound field properties of non-cavitating marine propellers