摘要
对风洞中平板湍流边界层施加局部周期性吹吸扰动,并用IFA-300热线风速仪测量了其近壁区域不同法向位置瞬时速度的时间序列信号.利用湍流边界层对数律平均速度剖面,计算湍流的壁面摩擦阻力.对平板湍流脉动速度信号用子波分析进行多尺度分解,通过条件采样以及相位平均的方法获得不同尺度下的相干结构波形和能量分布,来研究吹吸扰动对平板湍流边界层的摩擦阻力的影响.结果表明,扰动使得窄缝附近流动阻力增加,而下游区域流动阻力减小.
An experimental study was carried out to investigate the effect of local forcing on the friction drag of a turbulent boundary layer.The local forcing was given to the boundary layer flow by means of a sinusoidally oscillating jet issuing from a thin spanwise slot at the wall.The relationship among some inner-scales physical parameters,e.g.the mean-velocity profile,skin friction velocity and fluid dynamics viscosity,and the relationship between skin friction velocity and skin friction shear stress were taken...
出处
《航空动力学报》
EI
CAS
CSCD
北大核心
2009年第10期2163-2168,共6页
Journal of Aerospace Power
基金
国家自然科学基金(10832001,10872145)
关键词
吹吸扰动
摩擦阻力
湍流边界层
相干结构
子波分析
blowing and suction
friction drag
turbulent boundary layer
coherent structures
wavelet analysis
