天然明渠减速流超大尺度湍流结构特性初步研究

张鹏; 段炎冲; 王永强; 胡江; 杨胜发; 李文杰

doi:10.11988/ckyyb.20210617

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raybet体育在线院报 ›› 2022, Vol. 39 ›› Issue (9) : 77-83. DOI: 10.11988/ckyyb.20210617

水力学

天然明渠减速流超大尺度湍流结构特性初步研究

张鹏¹, 段炎冲², 王永强³, 胡江⁴, 杨胜发¹, 李文杰¹

作者信息 +

Preliminary Research on Characteristics of Very-large-scale Turbulence Motions in Decelerating Open Channel Flow

ZHANG Peng¹, DUAN Yan-chong², WANG Yong-qiang³, HU Jiang⁴, YANG Sheng-fa¹, LI Wen-jie¹

Author information +

文章历史 +

摘要

为探究天然明渠减速流中超大尺度湍流结构特性,使用声学多普勒剖面流速仪(ADCP)和声学多普勒流速仪(ADV)对重庆河段开展了单条垂线以及水面区域固定点的三维瞬时流速测量,对紊动强度、超大尺度湍流结构波长以及湍动能占比等进行了分析。初步结果显示:在天然明渠减速流中仍然存在超大尺度湍流结构,其纵向尺度在沿水深方向上表现为先增大后减小的变化趋势;减速流中超大尺度湍流结构能够在水面区域维持自身结构且携带着大部分的湍动能。

Abstract

This study experimentally examined the very-large-scale motions (VLSMs) characteristics in decelerating open-channel flow based on acoustic Doppler current profiler (ADCP) and acoustic Doppler velocimeter (ADV) measurements. Meanwhile, the turbulence intensity, VLSMs’ wavelength and turbulent kinetic energy ratio were analyzed. Statistical evidence of the presence of VLSMs in decelerating open channel flow was presented. Moreover, its streamwise scale increased first and then decreased along with the water depth. The VLSMs still exist in the water surface area of the decelerating open channel flow and occupy about 46% of the turbulent kinetic energy.

导出引用

张鹏, 段炎冲, 王永强, 胡江, 杨胜发, 李文杰. 天然明渠减速流超大尺度湍流结构特性初步研究[J]. raybet体育在线院报. 2022, 39(9): 77-83 https://doi.org/10.11988/ckyyb.20210617

ZHANG Peng, DUAN Yan-chong, WANG Yong-qiang, HU Jiang, YANG Sheng-fa, LI Wen-jie. Preliminary Research on Characteristics of Very-large-scale Turbulence Motions in Decelerating Open Channel Flow[J]. Journal of Changjiang River Scientific Research Institute. 2022, 39(9): 77-83 https://doi.org/10.11988/ckyyb.20210617

中图分类号： TV131.2

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