中文核心期刊
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中国科技核心期刊
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Journal of Chongqing Jiaotong University(Natural Science)

Journal of Chongqing Jiaotong University(Natural Science) ›› 2008, Vol. 27 ›› Issue (3): 460-462.

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The Spectrum Analysis about Velocity Pulsation of Turbulent Flow in Clear Water

LIU Li1, YANG Cheng-yu2, HE Guang-chun2, WEI Qing-hua3   

  1. 1. School of Applied Science & Technology, Chongqing Jiaotong University, Chongqing 400042, China;
    2. School of River & Ocean, Chongqing Jiaotong University, Chongqing 400074, China;
    3. Chongqing Communication Planning Survey & Design Institute, Chongqing 400064, China
  • Received:2007-07-19 Revised:2007-10-10 Online:2008-06-20 Published:2016-11-14

清水紊流流速脉动的谱分析

刘丽1, 杨成渝2, 何光春2, 魏清华3   

  1. 1. 重庆交通大学 应用技术学院, 重庆 400042;
    2. 重庆交通大学 河海学院, 重庆 400074;
    3. 重庆交通规划勘察设计院, 重庆 400064
  • 作者简介:刘丽(1979-),女,吉林舒兰人,讲师,博士研究生,主要从事路基水毁防护研究。E-mail:LLwwqqhh@163.com;Tel:13983203268。

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Abstract: Throagh the data collected current velocity in a period of time,spectrum characteristics of velocity are transformed from current velocity pulse signal in time domain to signal in frequency domain with FFT.The conclusion of turbulent flow energy concentrates in the low frequency is drawn.It finds oat the relations betueen the width of frequency and Fr and that betaeen the width of frequency and Re.

Key words: turbulent flow, frequency analysis, stochastic process, spectrum characteristic

摘要： 通过量测一段时间内的瞬时流速分布,依据大量的试验数据,利用傅立叶变换将时域流速脉动信号转换为频域进行相关的谱分析,显示出清水紊流的能量集中于低频段附近,并找出了雷诺数与频带宽度的初步关系,弗汝德数与频带宽度的初步关系。

关键词: 紊流, 频域分析, 随机过程, 谱特性

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