船尾流場中のプロペラ性能 : 第一報:船尾伴流とプロペラ縮流の影響

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Effects of wake, propeller flow contraction and rudder on propeller performance characteristics have been studied theoretically and experimentally in order to understand performance characteristics of propeller working in the flow field behind ship and to improve the propeller efficiency. In this paper, the effects of wake and propeller flow contraction are descrived as the 1st report. Performance characteristics of propeller designed for a reefer were calculated fully in uniform flow and in wake flow by using non-linear propeller lifting surface theory. These results showed that energy loss between the root and 0.6 radius increased in the wake flow in comparison with that in uniform flow. Wake propeller, which pitch near the root part was lowered in order to improve propeller efficiency, was designed and tested in the towing tank with conventional propeller (original propeller). The results of these model tests showed that efficiency of the wake propeller was 1.5% lower in uniform flow and was 2.9% higher in the wake flow than those of the original propeller. At the same time, thrust coefficients and torque coefficients of the two propellers (original propeller espcially) decreased by from 14% to 20% in the wake flow comparing with those in uniform flow. Theoretical consideration clarified that the propeller flow contraction decreased the effective wake and decreased thrust coefficients and torque coefficients of the two propellers necessarily. Especially, the flow contraction of the original propeller became larger because of the large induced velocity near the root part. The above-mentioned difference of propeller efficiency 2.9% in the wake flow was considered to be caused by the wake distribution and the difference of the propeller flow contractions.
社団法人日本船舶海洋工学会の論文
1989-08-25

船尾流場中のプロペラ性能 : 第一報:船尾伴流とプロペラ縮流の影響

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