ROLLING MOMENT CHARACTERISTIC ANALYSIS OF WRAP-AROUND FINS
A lot of numerical and experimental studies indicate that wrap-around fins (WAFs) configuration exhibits a self-induced rolling moment even at angle of attack zero. It depends on the unequal pressure distributions over both sides of the fin. So we try to prove this special aerodynamic characteristic with a theoretical method. According to the transonic small perturbation potential theory as well as the transonic small perturbation potential equation, this paper found the expressions of the WAFs convexity and the concave pressure coefficient at subsonic and supersonic by solving the Laplace equation and the Bessel function of imaginary argument, and analyze the phenomena of WAFs rolling moment generation at angle of attack zero, and discuss the reason. The flow field of a projectile with WAFs is solved by numerical method to check the pressure distributions of the two surfaces of the wing at subsonic and supersonic respectively. The computational result is accordant to the theoretical analysis results. It is proved that the complicated pressure distribution of the wing surfaces leads to the particular characteristic of rolling moment.
CHEN Xin-hong ZHAO Run-xiang
School of Power Engineering, Nanjing University of Science & Technology, No. 200 Xiaolingwei Street, Nanjing, Jiang Su Province, China
国际会议
25th International Symposium on Ballistics(第25届国际弹道会议)
北京
英文
266-269
2010-05-17（万方平台首次上网日期，不代表论文的发表时间）