Indexed by:期刊论文

Date of Publication:2012-05-01

Journal:KSCE JOURNAL OF CIVIL ENGINEERING

Included Journals:SCIE、EI

Volume:16

Issue:4

Page Number:465-477

ISSN No.:1226-7988

Key Words:ship's propeller jet; Laser Doppler Anemometry (LDA); zone of flow; establishment

Abstract:In the present study an experimental investigation of the time-averaged velocity and turbulence intensity distributions from a ship's propeller, in "bollard pull" condition (zero speed of advance), is reported. Previous studies have focused mainly on the velocity profile of not a rotating ship propeller but a plain jet. The velocity profile of a propeller is investigated experimentally in this study. The velocity measurements were performed in laboratory by using a Laser Doppler Anemometry (LDA). The measurements demonstrated two-peaked ridges velocity profile with a low velocity core at the centre within the near wake. The two-peaked ridges combined to be one-peaked ridge at 3.68 diameters downstream indicating the end of the zone of flow establishment. The study provides useful information from a rotating ship's propeller rather than a simplified plain jet to researchers investigating flow velocity generated from a propeller and probably resulting local scouring.