北京大学学报(自然科学版)

防风网泄流区湍流的子波分析

林官明, 叶文虎   

  1. 北京大学环境学院环境科学系,环境模拟和污染控制国家重点联合实验室,北京,100871
  • 收稿日期:2002-09-18 出版日期:2003-09-20 发布日期:2003-09-20

Wavelet Analysis of Turbulent Signal in the Lee of Windbreak

LIN Guanming, YE Wenhu   

  1. Department of Environmental Sciences, State Joint Key Lab of Environmental Simulation and Pollution Control, Peking University, Beijing, 100871
  • Received:2002-09-18 Online:2003-09-20 Published:2003-09-20

摘要: 在边界层风洞中模拟了防风网附近的湍流流动,应用子波分析对防风网泄流的湍流信号进行了研究,发现与无防风网平坦条件相比,湍涡的能量及发生的频率都有显著降低。这说明,防风网在降低风速的同时也降低了湍涡发生频率,起到抑制起尘的作用。

关键词: 近地面层, 湍流相干结构, 子波分析, 起尘抑制

Abstract: The turbulent flow near the windbreak is simulated in the boundary layer wind tunnel. Wavelet analysis is used to study the turbulent signal in the lee side of the windbreak. Compared with the flow without windbreak, the turbulent energy and the frequency of vortex are reduced dramatically. The evidence shows how the wind break prevents the dust emission.

Key words: surface layer, turbulent structure, wavelet analysis, dust emission prevention

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