Coherent Structures in a Fully Developed Turbulent Pipe Flow
Coherent Structures in a Fully Developed Turbulent Pipe Flow
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充分发展的湍流管流中的相干结构
DOI：
10.1299/jsme1958.29.1156
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发表时间：
1986
期刊：
影响因子：
--
通讯作者：
Y. Kobashi
中科院分区：
文献类型：
--
作者：
Nozomi TANIFUJl;Makoto Lchijo;S. Iida;Y. Kobashi
对完全发展的紊流管内的相干结构进行了实验研究。测量了壁面压力波动与速度波动的两个分量之间的时空相关性，以及这些波动的条件采样相对于爆发的行为。结果表明，爆流平均对流速度与中心速度的比值约为0.68，爆流有助于产生壁面压力波动的高频分量，并且存在从壁面附近向流动中心区域延伸的大规模相干结构。并将所得结果与充分发展的湍流平面边界层流动进行了比较。
Coherent structures in a fully developed turbulent pipe flow are studied experimentally. The space-time correlations between wall pressure fluctuations and two components of velocity fluctuations, and behavior of those fluctuations conditionally sampled with respect to bursts are measured. According to the results, a factor of the averaged convection velocity of the burst to the center velocity is about 0.68, the bursts contribute to the production of higher frequency components of the wall pressure fluctuations, and further, there exist large scale coherent structures which extend from near the wall to the center region of the flow. Moreover, these results are compared with those of the fully developed turbulent plane boundary layer flow.