本文設計新型環驅式推進器與環驅式螺槳，並且製作一具可驅動單一環驅螺槳或對轉環驅式螺槳之環驅式螺槳驅動機構，與一具可在空蝕水槽驅動傳統式螺槳、導罩螺槳與對轉螺槳之傳統式螺槳驅動機構。本研究使用質點影像速度儀（PIV系統）作為觀察流場的工具，測量傳統式螺槳、環驅式有轂與無轂螺槳轉動至固定的相位角時產生的流場特性並比較其差異，以作為螺槳設計理論的參考與螺槳設計方法的驗證。
　　與傳統式螺槳同樣性能要求下的環驅式推進器，其螺槳最佳化轉速較傳統式螺槳更低，但其效率是否較高會受推進器包覆環驅式馬達的導罩形狀影響。PIV實驗結果顯示：環驅式螺槳可以減少螺槳後跡流的強度，環驅式無轂螺槳中心部份的區域流場不受螺槳影響；兩種環驅式螺槳產生的紊流與漩渦皆較傳統式螺槳小；而環驅式無轂螺槳與環驅式有轂螺槳相比，渦度較小但紊流強度較大。

　　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.

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