The influence of blade number on the performance of cavitating propeller at inclined shaft condition

• Main Authors: CHANG, YUAN_CHEN, 張原禎
• Other Authors: KEHR Y. Z.
• Format: Others
• Language: zh-TW
• Published: 1998
• Online Access: http://ndltd.ncl.edu.tw/handle/33039304122828750027

碩士 === 國立海洋大學 === 造船工程學系 === 86 === ABSTRACT This thesis is aimed at designing a propeller which is outstanding in performance, to serve as a parent model of a new series for high speed patrol boats. A new design procedure and philisophy is estabilished to design the so- called new-section propeller. It is different from the method used for conventional NACA a=0.8 section. For the propeller of high speed craft , the performance of the new-section prepeller is measured at different cavitation numbers at the inclined shaft condition, and compared with that of Newton- Rader propeller. The experimental results show that both the efficiency of the new-section propeller and the cavitation extension on blade are better than those of the Newton-Rader propeller at the inclined shaft condition regardless cavitation numbers. For propeller of container ship, one of the most important issues is the reduction of pressure fluctuation induced by a cavitating propeller. Similarly, a design procedure and philisophy which takes account of strength problem of blade due to high skew is estabilished to design new-section propellers. The results of experiment and calculation also show that both the cavitation volume and the pressure fluctuation on ship stern induced by new- section propeller are much lower than those of NACA propeller.