首页 | 本学科首页   官方微博 | 高级检索  
     

基于混沌理论的明渠湍流速度特征
引用本文:夏伟,陈和春,王继保,刘超凡,陈艳超,陈仕桐. 基于混沌理论的明渠湍流速度特征[J]. 长江科学院院报, 2019, 36(12): 65-70. DOI: 10.11988/ckyyb.20180389
作者姓名:夏伟  陈和春  王继保  刘超凡  陈艳超  陈仕桐
作者单位:三峡大学 水利与环境学院,湖北 宜昌,443002
摘    要:为了揭示湍流运动的混沌特征规律,选择明渠水槽试验,采用ADV测量沿程衰减的湍流速度场,结合混沌理论,对湍流速度时间序列进行相空间重构,计算对应的混沌特征参数(延迟时间、关联维度、Lyapunov指数、Kolmogrov熵),探究明渠湍流速度混沌特征。分析结果表明:明渠湍流具有混沌特征;安装湍流控制板后,沿水深向上方向和水流方向,湍流的混沌特性不断减弱;进一步通过与湍流统计平均参数比较表明,混沌特征参数的强弱能够反映出湍流涡结构在空间耗散和消亡的变化规律。

关 键 词:明渠湍流  混沌理论  相空间重构  延迟时间  关联维度  Lyapunov指数  Kolmogrov熵
收稿时间:2018-04-18

Characteristics of Turbulent Velocity in Open Channel Based on Chaos Theory
XIA Wei,CHEN He-chun,WANG Ji-bao,LIU Chao-fan,CHEN Yan-chao,CHEN Shi-tong. Characteristics of Turbulent Velocity in Open Channel Based on Chaos Theory[J]. Journal of Yangtze River Scientific Research Institute, 2019, 36(12): 65-70. DOI: 10.11988/ckyyb.20180389
Authors:XIA Wei  CHEN He-chun  WANG Ji-bao  LIU Chao-fan  CHEN Yan-chao  CHEN Shi-tong
Affiliation:College of Water Conservancy and Environment, Three Gorges University, Yichang 443002, China
Abstract:Open channel flume experiment was performed in an attempt to reveal the chaotic characteristics of turbulent flow. The turbulent flow velocity field attenuating along the flow direction was measured using Acoustic Doppler Velocimetry (ADV). In the light of the chaos theory, phase space reconstruction of the turbulent velocity time series was performed to calculate the corresponding chaotic characteristic parameters (including time delay, correlation dimension, Lyapunov exponent, and Kolmogrov entropy). Results demonstrated that the turbulence in open channel is of chaotic characteristics. After installing the turbulence control board, the chaotic characteristics of turbulence are continuously weakened along the upward direction of water depth and the water flow direction. The aforementioned chaotic characteristic parameters were further compared with the statistical average parameters, and results proved that the chaotic characteristic parameters reflect the law of the dissipation and perish of turbulent vortex structures in space.
Keywords:turbulent flow in open channel  chaos theory  phase space reconstruction  time delay  correlation dimension  Lyapunov exponent  Kolmogrov entropy  
本文献已被 CNKI 万方数据 等数据库收录!
点击此处可从《长江科学院院报》浏览原始摘要信息
点击此处可从《长江科学院院报》下载全文
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号