| Summary: | 碩士 === 國立成功大學 === 系統及船舶機電工程學系碩博士班 === 94 === This research investigates the design and the flow characteristics of rim-driven propulsor. The flow characteristics of the wake behind a rotating propeller were studied using a PIV (particle image velocimetry) system in a cavitation channel. Two specially-designed mechanisms were used to drive a single conventional propeller and counter rotating conventional propellers in the cavitation channel, and to drive a single rim propeller and counter rotating rim propellers, respectively. Propellers under studied included a rim propeller with hub, a rim propeller without hub, and a conventional propeller to compare the flow characteristics of different propellers, and to improve the method and process of propeller design.
It is found that the RPM of an optimized rim-propulsor is lower than the conventional propeller at same performance requirements, but its efficiency is highly influenced by the shape of the duct in which the PM motor is installed. The result of experiment shows that the flow fluid in the center zone is not affected by rotating blades by the rim-propeller without hub. The vortex and turbulence of two kinds of rim propellers are weaker than the conventional propeller. The vorticity of the rim-propeller without hub is smaller than the rim-propeller with hub, but the turbulence intensity is larger.
|
|---|
