臺灣博碩士論文加值系統

本文主要目的，是以實驗探討斜軸狀況下，不同空蝕係數時之螺槳性能，
比較新翼型螺槳與Newton-Rader螺槳，並同時量測螺槳因軸傾斜而產生之
垂向力及側向力，以便計算出螺槳於斜軸狀況下對船之有效推力及真正效
率。之後，以非定常螺槳升力面理論計算螺槳於斜軸狀況下之垂向力及側
向力，比較計算上與實驗上之差異。實驗中發現垂向力大小在斜軸角度
為8度時、J值於螺槳設計點附近，垂向力大小約為推力之40% ~ 50%。此
外，斜軸下之螺槳效率明顯較平軸為低。並由實驗顯示，不論於何種空蝕
係數之下，於斜軸8度時，新翼型螺槳之效率均較Newton-Rader螺槳為高
。

This paper is aimed to study the performance of the propeller
under different cavitation numbers at inclined shaft condition,
and to compare the performance between the New-Section propeller
and the Newton-Rader propeller. In order to calculate the
effective thrust and the real efficiency for the craft, the
horizontal and vertical forces which are both created by the
propeller at inclined shaft are measured. When the inclined
shaft angle is 8 degrees and the advance coefficient is near the
propeller design point, the measrued vertical force is about 40%
~ 50% of the shaft thrust. And, the efficiency of the propeller
at 8-degree shaft inclination is significantly less than that of
the propeller with horizontal shaft. The experiment also shows
that the efficiency of the New-Section propeller is greater than
that of the Newton-Rader propeller at inclined shaft condition
regardless cavitation numbers. In addition, the "Unsteady
Propeller Lifting-Surface Theory" is applied to calculate the
vertical force produced by the propeller at inclined shaft
condition. Due to the simple mathmatical model about wake in
propeller theory, the computational results are much lower than
the measured values.