摘要
本文用激光测速技术和VIFA技术研究了平板湍流边界层的猝发频率与雷诺数的关系,本文给出,在雷诺数Re_θ=320到1470的范围内,以边界层内部参量无量纲化的猝发频率f^+户基本保持不变,其值为0.0105,而以边界层外部参量无量纲化的猝发频率,则随Re_θ的增加而增加,这一结果,是对Blackwelder(1983)实验结果的补充和扩展,伹与早期的结果相反。
Employing laser Doppler anemometry and VITA technique, the bursting frequency in turbulent boundary laryers has been measured over the Reynolds-number range 320-1470. The result indicates that when the average bursting frequency is scaled with the variables appropprite for the wall region, the non-dimensional frequency is constant and independent of Reynolds number. When the same duta are plotted using the .cuter vatiables of boundary layer to normalize the bursting frequency, it indicats that the non-dimensional frequency increases as the Reynolds number increases. This is in agreement with the results of Blackwelder et al. (1983) who used hot wire anemometry and VITA technique.
出处
《力学学报》
EI
CSCD
北大核心
1989年第4期391-395,共5页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金
关键词
湍流
边界层
猝发频率
雷诺数
turbulent boundary layer, bursting frequency, conditional sample
