Application of sliding mesh model for flow simulation of contra-rotating screws

• Main Authors: Kao, Yu-Wei, 高育瑋
• Other Authors: Chen, De-Wei
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/91803759196171993046

碩士 === 國防大學中正理工學院 === 造船工程研究所 === 96 === A propeller is the important equipment for ship propulsion systems. For the use of a single propeller, it always appears an asymmetrical torque, and results in the stability problems regarding ship’s navigation. Compared with single propeller, the Counter-Rotating Propeller (CRP) could serve to improve the asymmetrical torque effect of the conventional propeller, and let the backward propeller to recover rotational energy from the forward propeller. The CRP is valuable for the design of ship propulsion systems. To get better understanding of CRPs, this thesis would study the fluid dynamics of them by employing the numerical simulation method. In order to investigate the rotating effect of CRP, the sliding mesh technique will be applied to resolve the mechanism of such devices. The computational results of the single propeller flow simulation have been validated with the experimental data. It reveals that the numerical method employed in this thesis could be useful for the study of the complicated propeller flow. The radius and propeller spacing of a CRP, which is the distance between the forward propeller and the backward ones, could be the important parameters to determine the propulsive efficiency of the CRP. Performing calculations on these parameters has been analyzed in this research. The numerical results obtained from this study could provide some distinct characteristics of the CRP for the propeller designers.