本研究目的為針對螺槳處於低前進係數狀態下之單獨螺槳性能改善，探討螺槳之導緣改變成類似座頭鯨之鰭狀肢突節外形的影響。本文使用B系列螺槳之B4-70為導緣變化之母體，設計兩種不同形式之導緣突節變化，於拖航水槽分別對各個螺槳進行單獨螺槳性能實驗以及毛線流場可視化實驗，探討分析實驗之結果並比較其性能之差異性。實驗結果顯示:導緣有變化之螺槳於低前進係數(J=0~0.55)時推力與轉矩係數變小，效率並沒有明顯的改善，而在高前進係數(J＞0.55)時導緣有變化之轉矩係數下降較推力係數小，故效率略為下降。流場可視化結果顯示:毛線於導緣突節正後方沒有比較明顯的擺動或是偏移現象，這與二維翼型結果不同，原因可能是未達失速範圍，突節之效果不好，而導緣後掠與扭轉之影響則需進一步探討。

The purpose of this study of propeller performance improvement at low propeller advance coefficient is to explore effect of the leading edge change that is similar to the humpback whales’ flipper Protuberances. In this paper, the experiment of B-series propeller (B4-70) with two different forms of leading edge change were carried out in a towing tank, including propeller performance experiments and visualization of propeller flow field. The results of performance experiments show that the efficiency of leading edge changes is not better at low advance coefficient (J=0~0.55), but slightly declines at high advance coefficient (J＞0.55). Flow visualization results showed that the tufts behind leading-edge protuberances do not have obvious swinging, meaning that vortex and turbulence is not strong. This is different from 2-dimensional wing with protuberances. The reason is probably that most part of the propeller did not reach stall regime, such that the effect of protuberances is not obvious. The effect of swept leading edge and twisted blade needs further study.

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