大迎角细长体头涡结构演变的非定常现象研究  

The unsteadiness study of nose vortices in the flow over slender body at high angles of attack

作　　者：马宇[1] 刘沛清[1] 邓学蓥[1] 史京玲[1] 

机构地区：[1]北京航空航天大学流体力学研究所,北京100083

出　　处：《实验流体力学》2004年第4期72-77,共6页Journal of Experiments in Fluid Mechanics

基　　金：国家自然科学基金(10172017);航空基础科学基金(02A51048);翼型叶栅空气动力学国防科技重点实验室基金(00JS51.3.2HK01)

摘　　要：细长旋成体绕流中位于尖部附近的一对头涡在迎角增至一定程度时,会表现出很强的非定常特征,而此时后体上为类卡门涡脱落区域。为了寻找这对头涡的非定常特征随迎角变化的规律,在两个风洞中分别用两个细长体模型进行测压和流动显示实验,得到了在很大迎角下旋成体头涡的脉动频率随迎角基本呈线性变化的规律,而后体上的卡门涡脱落频率则与迎角的正弦值成正比。There is a strong unsteady characteristic aroused by the two vortices near the apex of cylinder when the angle of attack of it comes to a certain degree, while the Karman vortex street region is formed on the afterbody. In this paper, the pressure fluctuation characteristics of the two modes and the laws of the characteristics changed with the angle of attack increasing were proved in two different wind tunnels with two machined slender body models. In the nose vortices region, the relationship between the pressure fluctuation frequency and the cylinder attack is linear, and the frequency of the Karman vortex shedding is in proportion to the sine of the attack angle.

关 键 词：头涡 卡门涡脱落 压力脉动 

分 类 号：V211[航空宇航科学与技术—航空宇航推进理论与工程] V211.7