스큐 변화에 따른 추진기 소음 특성에 관한 연구

Abstract

Noise reduction and control is an important problem in the performance of underwater acoustic system and on the habitability of the passenger ship for crew and passenger. Furthermore, sound generated by a propeller is critical in underwater detection and is often related to the survivability of the vessel especially for military purpose. Generally propeller noise is often the dominant noise source of marine vehicle. Therefore, it is important to analyze the dominant noise source of underwater propeller and its characteristics. This paper presents a numerical study on noise of underwater skew propeller. A brief summary of numerical methods with verification and results are presented. The flow field is analyzed with potential-based panel method, and then the time dependent pressure and sheet cavity volume data are used as the input for Ffowcs Williams-Hawkings formulation to predict the far-field acoustics. Through this study, the dominant noise source of underwater propeller is analyzed, which will provide a basis for proper noise control strategies.