【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。更多还原

【Abstract】 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 changed 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.更多还原