EXPERIMENTAL STUDY OF VENTILATED SUPERCAVITIES WITH A DYNAMIC PITCHING MODEL

• Published in: Journal of Hydrodynamics Vol. 20; no. 4; pp. 456 - 460
• Main Authors: LEE, Qi-tao, XUE, Lei-ping, HE, You-sheng
• Format: Journal Article
• Language: English
• Published: Singapore Elsevier Ltd 01.08.2008; Springer Singapore
• Subjects: Engineering; Engineering Fluid Dynamics; Hydrology/Water Resources; impact; Numerical and Computational Physics; pitching motion; Simulation; supercavitating flow; ventilated cavitation; water tunnel; 俯仰运动; 冲击实验; 气穴现象; ventilated cavitation; supercavitating flow; water tunnel; impact; pitching motion
• ISSN: 1001-6058; 1878-0342; 1000-4874
• DOI: 10.1016/S1001-6058(08)60080-3

An investigation of the ventilated supercavitation for a supercavitating vehicle pitching up and down in the supercavity was carded out in a high-speed water tunnel. The emphasis is laid on the understanding of the interaction of the vehicle aft body with the cavity boundary. The flow characteristics were measured and the stability of supercaviting flow with different pitching frequencies and amplitudes was analyzed. In particular, the objectives of this study are to understand the effect of the impact upon the cavity distortion, and to quantify the impact process by investigating the evolution of the pressure inside the cavity and then the loads on the vehicle during the pitching motion. It is also shown that the evolution of the pressure detected in different,as inside the supercavity, is coherent and uniform during the periods of the pitching motion. This study is of direct relevance to reliable and accurate prediction of hydrodynamic loads associated with the slamming and impact on supercavitating vehicles.