| 各向同性均匀湍流近壁结构及泥沙起动 |
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| 引用本文： | 刘春嵘,呼和敖德.各向同性均匀湍流近壁结构及泥沙起动[J].海洋工程,2003,21(3):50-55. |
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| 作者姓名： | 刘春嵘 呼和敖德 |
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| 作者单位： | 中国科学院,力学研究所,北京,100080 |
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| 摘 要： | 采用振动格栅产生的各向同性均匀湍流研究了泥沙的起动。应用PTV技术和局部光学放大技术对湍流场进行了测量，发现近壁面湍流动能的指数分布规律。分析了泥沙在均匀同性湍流中的起动机制，并用概率统计理论对泥沙的起动进行了定量的描述。通过测定泥沙起动事件的概率，得到了同种泥沙在不同流动参数下起动的临界湍流动能。
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| 关 键 词： | 各向同性均匀湍流 近壁湍流结构 泥沙起动 PTV测速技术 |
| 文章编号： | 1005-9865(2003)03-0050-06 |
| 修稿时间： | 2002年7月22日 |
Homogenous turbulence structure near the wall and sediment incipience |
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| Abstract: | The sediment incipience in homogenous turbulence generated by oscillating grids is studied in this paper. The turbulent flow is measured by using PTV technique. The integral length scale and time scale of turbulence are obtained. The turbulent flow near the wall is measured by local optical magnification. It is found that the turbulent energy near the wall obeys the power law. The mechanism of sediment incipience in homogenous turbulence is analyzed. The dimensionless parameters that affect the sediment incipience are obtained based on by dimensional analysis. The sediment incipience is described by using static theory. The incipient turbulent energy for the same sediment with different flow parameters is calculated by measuring the probability of incipient events. |
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| Keywords: | homogenous turbulence turbulent structure near the wall sediment incipience PTV technique |
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