细长体大迎角绕流的滚转角特性  

Effects of roll angle on side force distribution over slenderbodies of revolution at high angle of attack

作　　者：王刚[1] 梁新刚[1] 邓学蓥[2] 

机构地区：[1]清华大学工程力学系,北京100084 [2]北京航空航天大学飞行器设计与应用力学系,北京100083

出　　处：《实验流体力学》2004年第4期11-14,19,共5页Journal of Experiments in Fluid Mechanics

摘　　要：尖拱和钝拱细长体的截面侧向力分布呈现明显的滚转角效应。不同滚转角下尖拱侧向力沿轴向分布曲线(CC～x/D)的相位和半周期各不相同,截面侧向力随滚转角变化(CC～)呈现一定的无规律性;而钝拱CC～x/D曲线的相位和半周期基本相同,但振幅值大小依赖于滚转角,CC～分布呈完全的无规律性。尖拱模型头部的加工精度导致的微扰动使得尖拱CC～x/D分布变成型式基本一致的两簇曲线,其特征点和半周期分别对应相同,CC～分布呈现典型的双周期方波。Roll angle effects of slender bodies with three different noses are experimentally studied at high angles of attack. The side force distributions (C_C～x/D) over the pointed-nose slender (model Ι) are greatly affected by the roll angle () with different curve phases and half-cycles. The sectional side force　distributions vs the roll angle (C_C～) show some randomicity. While the curves C_C～x/D over another pointed-nose slender (model ΙΙ) turn into two curve clusters with nearly the same curve phases and half-cycles, and the curves of C_C～ show a typical bistable state. The two pointed-nose models are designed with exactly the same geometry, and are machined at the same time by encoded control except that model Ⅱ has micro-imperfectness at the nose tip due to the mismachining　tolerance. But the curves C_C～x/D over the blunted-nose slender are not affected　by basically, with same curve phases and half-cycles, and the curves C_C～ show complete randomicity.

关 键 词：细长旋成体 大迎角 非对称 滚转角效应 双稳态 

分 类 号：V211.7[航空宇航科学与技术—航空宇航推进理论与工程]