A Study on Hydrodynamic Forces Acting on the Rudder of Fish-Shape Section with End Plates : Based on Experiments Using Rudder Models

Abstract

Abstracl R ent1y the ship equipPed soiUing rudder is on increase ． Generally ， the scilling rudder 孟 s the 五sh 『 shape section with end − plates and provides high lift pe forrrtance ． This n ！ dder can make wide range rudder a皿 gle to the maximum 70 degrees in comparison with n 。rmal one ， In addition ， it has a tendency not only to make high rudder thrust but also to maintain good perfb 蹴 e on bac ・ ard handHng ． As mentioned above ， 血 e sc 欟 ng rudder diSplays higher handling pedfqrmance ． than the no al 。ne ． especially in berthing controls ． However ． the mechanism bringing strong lift force even in 1arge rudder angle is not entirely studied yet To know the abeve mechanism will give usefU1 suggestion and inforrnation to navigator ， shipbuilder and marine engineer ． In this paper ， as the basic research clearing up this mechanism ， we examined eXperimentally the relation betwee且 the shape of fishhke rudder section and hydrodynamic forces ． And also in order to understand the mechanism ofhigh lift force ， we tried to carry out the yisualization of fluid fiow around rudder ． Kaywords ： schi 伽 9 rudder ． nudder ， visuaiization for stneam ， ． fish − shape sect ゴ on