A method based on potential theory for calculating air cavity formation of an air cavity resistance reduction ship

• Published in: Journal of marine science and application Vol. 7; no. 2; pp. 98 - 101
• Main Author: 李云波 吴晓宇 马勇 王金光
• Format: Journal Article
• Language: English
• Published: Heidelberg Harbin Engineering University 01.06.2008; College of Shipbuilding Engineering, Harbin Engineering University, Harbin 150001, China
• Subjects: Cavitation number; Electrical Machines and Networks; Engineering; Fluid dynamics; Geotechnical Engineering & Applied Earth Sciences; Grooves; Holes; Machinery and Machine Elements; Marine; Mathematical analysis; Offshore Engineering; Potential theory; Power Electronics; Ships; Simulation; 势能理论; 空气穴; 阻力还原; forming of air cavity; U661.1; cavitation number; air cavity resistance reduction; potential theory
• ISSN: 1671-9433; 1993-5048
• DOI: 10.1007/s11804-008-7077-x

This research is intended to provide academic reference and design guidance for further studies to determine the most effective means to reduce a ship’s resistance through an air-cavity. On the basis of potential theory and on the assumption of an ideal and irrotational fluid, this paper drives a method for calculating air cavity formation using slender ship theory then points out the parameters directly related to the formation of air cavities and their interrelationships. Simulations showed that the formation of an air cavity is affected by cavitation number, velocity, groove geometry and groove size. When the ship’s velocity and groove structure are given, the cavitation number must be within range to form a steady air cavity. The interface between air and water forms a wave shape and could be adjusted by an air injection system.