Effect of attack angle change on hydrodynamic character of supercavitating bodies

JIANG Zeng-hui, YU Kai-ping, WangChong, ZHANG Jia-zhong, HUANG Wen-hu

School of Astronautics,Harbin Institute of Technology,Harbin 150001,China,



Abstract:

A series of experiments has been done in a moderate-velocity cavitation tunnel to investigate the effects of attack angle change on hydrodynamic characters of supercavitation. Hydrodynamic characters of the aft section at various attack angles were compared. The investigation shows that hydrodynamic forces of the aft section are dependent of supercavity shapes at different attack angles,and the magnitude of hydrodynamic forces of the aft section varies with the change of attack angle. When the aft section is in the fully wetted case,the drag coefficient changes little. Lift and moment coefficients both increase with the increased attack angle,and the increase magnitude is not large. When the aft body planing is on the cavity boundary,the drag coefficient of nonzero attack angle is larger than that of zero attack angle,and the maximal lift and moment coefficients both vary obviously with the increased attack angle. In the case that the body is fully enveloped by cavity,the drag coefficient,lift coefficient and moment coefficient are nearly constant with the change of attack angles.

Key words:  ventilated supercavity  hydrodynamic character  attack angle

DOI：10.11916/j.issn.1005-9113.2009.03.023

Clc Number:U661

Fund: