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本文用流态显示技术和空间总压测量,对于钝头和尖拱形头部两个细长旋成体模型在中等和大迎角状态的复杂背涡系进行了实验研究。侧重于“二次分离区”的流动观察和测量。实验表明:在中等迎角时细长体背风面上存在有一对二次涡,它们的旋转方向相反;靠外侧的一个涡尺度较大,其旋转方向与同侧主涡相同,当同侧主涡破裂时,它也发生破裂。随迎角进一步增加此涡呈现出从物面上间断地形成和脱落。
In this paper, the fluid display technology and the total pressure measurement in space are used to study the complex vortex systems at medium and high angle of attack for two slender body models of blunt and pointed arched heads. Focus on the “secondary separation zone” of the flow observation and measurement. Experiments show that there is a pair of secondary vortices on the leeward surface of the slender body at a medium angle of attack, and their rotation directions are opposite. On the outer side, a vortex scale is larger and its rotation direction is the same as that of the same-side main vortex. When the vortex breaks, it also cracks. This vortex increases further with the angle of attack showing intermittent formation and detachment from the object surface.