细长旋成体大迎角绕流的背涡结构与压力脉动特性  

Vortices structure and pressure fluctuation characteristics of the flowover slender body at high angles of attack

作　　者：马宇[1] 邓学蓥[1] 刘沛清[1] 郗忠祥[2] 史京玲[2] 

机构地区：[1]北京航空航天大学流体力学研究所,北京100083 [2]西北工业大学翼型研究中心,西安710072

出　　处：《空气动力学学报》2004年第2期165-170,共6页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(10172017);航空基础科学基金(02A51048);武器装备预研基金(51413020103HK0167)的资助项目.

摘　　要：在亚临界流动范围内,通过尖拱细长旋成体在无侧滑状态下的脉动压力测量,对大迎角下细长旋成体非对称背涡结构沿轴向的压力脉动特征进行了研究分析,揭示了压力的脉动幅度与频率沿旋成体轴向的变化规律及其与背涡结构之间的对应关系,并对压力脉动特征沿轴变化的原因进行了初步探讨。In order to study the pressure fluctuation characteristics of the flow over slender body at high angels of attack, an experimental of measurement of pressure include time-averaged pressure and fluctuation pressure was carried out in subcritical Reynolds number range. The pressure fluctuation on both sides along the axis of the cylinder was compared to the cross-section vortices structure, which educed by the measurement of mean pressure based on the physical model of asymmetric vortices. Three conclusions were made, the vortices structure pressure fluctuation magnitude of slender ogive-cylinder increases, and the corresponding frequency deceases as the value of x/D increases in general. Secondly the pressure fluctuation amplitude in the lower location vortex is greater and the frequency is lower than the other side on each section. The based reason for the changing of pressure fluctuation characteristics is the alternately vortex shedding along the slender cylinder axis.

关 键 词：旋成体 迎角绕流 背涡结构 压力脉动 飞行器 侧向力 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程]