翼身融合水下滑翔机翼梢小翼减阻效应研究

This paper aims to explore the effect of winglet equipped in blended wing body (BWB) underwater gliders.Com- putational fluid dynamics (CFD) method was used to obtain the fluid dynamic characters of BWB underwater gliders.The drag reduction efficient of different glider models with different height,sweep angle and slope angle under variable angles of attack were obtained and analyzed.Wake flow of different models was observed and the principles of drag reduction were analyzed.Comparisons between different models reveal that the vortex in wake flow is significantly affected by the winglet in a certain velocity.A proper winglet helps reducing the vortex magnitude and inhibits the occurrence of the vortex.As a result,the drag decreases in certain angles of attack.