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。
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.
作者
张鹏
段炎冲
王永强
胡江
杨胜发
李文杰
ZHANG Peng;DUAN Yan-chong;WANG Yong-qiang;HU Jiang;YANG Sheng-fa;LI Wen-jie(National Engineering Research Center for Inland Waterway Regulation,Chongqing Jiaotong University,Chongqing 400074,China;State Key Laboratory of Hydroscience and Engineering,Tsinghua University,Beijing 100084,China;School of River&Ocean Engineering,Chongqing Jiaotong University,Chongqing 400074,China;Key Laboratory of Ministry of Education for Hydraulic and Water Transport Engineering,Chongqing Jiaotong University,Chongqing 400074,China)
出处
《长江科学院院报》
CSCD
北大核心
2022年第9期77-83,共7页
Journal of Changjiang River Scientific Research Institute
基金
国家重点研发计划项目(2018YFB1600400)
国家自然科学基金项目(51679020)
重庆交通大学科研启动项目(20JDKJC-C008)。
关键词
减速流
超大尺度湍流
拟序结构
功率谱
湍动能
decelerating flow
very-large-scale motions
coherent structure
power spectra
turbulent kinetic energy
