摘要
在迎角很大时细长旋成体背部流场沿轴向通常有两个截然不同的区域,其中卡门涡脱落区域位于后体,而头涡区域靠近旋成体头部。为了寻求两者的区别与联系,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,得到了沿旋成体轴向不同区域的压力脉动特征,即头涡的脉动幅度相对卡门涡较大,而频谱峰频率则较低,而且随着迎角的进一步增大,头涡区会完全消失。
There are two shedding modes along the slender axes when the angle of attack is very high. The Karman vortex shedding region is located in afterbody while the nose vortices region is near the apex. In this paper, the pressure fluctuation characteristics of the two modes and the laws of the characteristics changing with attack increasing were proved in two different wind tunnels with two machined slender body models. In the nose vortices region, the pressure fluctuation amplitude is greater and the frequency is lower than those in the Karman vortex street region. As the angle of attack increases, the nose vortices region will shrink and disappear at last.
出处
《流体力学实验与测量》
EI
CSCD
北大核心
2004年第2期65-70,共6页
Experiments and Measurements 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)的资助项目
关键词
细长旋成体
大迎角绕流
头涡
卡门涡
脉动压力
nose vortex
Karman vortex shedding
pressure fluctuation characteristic
