Structure of temperature fluctuations in a turbulent boundary layer
Structure of temperature fluctuations in a turbulent boundary layer
复制标题
湍流边界层中温度波动的结构
DOI：
10.1063/1.861990
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发表时间：
1977
影响因子：
4.6
通讯作者：
H. Q. Danh
中科院分区：
文献类型：
--
作者：
R. Antonia;H. Q. Danh
温度波动的统计测量在一个轻微加热的边界层以及下游的壁面热通量的阶跃变化。测量包括概率密度函数和温度的频谱和它的时间导数的分布，以及偏度和平坦度因子的分布。这些结果进行了比较与现有的数据的速度及其时间导数。雷诺数依赖的高阶矩的雷诺数/雷诺数是在定性协议由Frenkiel和Klebanoff获得的速度导数数据。在粘滞子层和粘滞子层的外区，（λ_c/λ_t）_2的光谱均呈现幂律行为，但两个区域的指数不同。
Statistics of temperature fluctuations are measured in a slightly heated boundary layer well downstream of a step change in wall heat flux. Measurements include probability density functions and spectra of temperature ϑ and of its time derivative ∂ϑ/∂t, and distributions of the skewness and flatness factors of ϑ and ∂ϑ/∂t. These results are compared with existing data for the velocity and its time derivative. The Reynolds number dependence of high order moments of ∂ϑ/∂t is in qualitative agreement with that obtained by Frenkiel and Klebanoff for velocity derivative data. Spectra of (∂ϑ/∂t)2 exhibit a power law behavior both in the viscous sublayer and in the outer region of the layer, but the exponent is different in the two regions.