摘要
利用电子束荧光技术对高超声速平板边界层中的扰动现象进行实验研究,实验在炮风洞中进行,自由流马赫数为7.8,单位长度雷诺数为3.5×107/m,测量了平均密度分布、脉动密度分布,并获得了湍流密度脉动的互相关分布和频谱分布。实验结果表明在过渡区中有序与随机现象并存。
The perturbation phenomena in hypersonic flat plate boundary layer are investigated wi th electronic beam fluorescence technique in a gun wind tunnel.Mach number of fr ee stream is about 7.8 and Reynolds number per unit length is 3.5×107/m.Avera ge density distribution and fluctuation desity distribution are measured.The cor relation distribution of turbulent density fluctuation and frequency spectrum di stribution is obtained.Our experimental results show that the phenomena are coex isted in order and at random in transition area.
出处
《流体力学实验与测量》
CSCD
2000年第4期51-57,共7页
Experiments and Measurements in Fluid Mechanics
基金
国家自然科学基金资助!(19372067)
关键词
高超声速平板边界层
电子束荧光
扰动
hypersonic flat plate boundary layer
electronic beam fluores cence technique
turbulent density fluctuation
chaos