明槽支流交汇区水动力特性PIV试验研究  

Experimental Study on Hydrodynamic Characteristics of Open Channel Tributary Intersection Area Based on PIV Technology

作　　者：吴菲 白凤朋 陈雪妮 刘瑞芬 杨中华[4] 王超 尹炜 WU Fei;BAI Feng-peng;CHEN Xue-ni;LIU Rui-fen;YANG Zhong-hua;WANG Chao;YIN Wei(College of Civil Engineering and Environment,Hubei University of Technology,Wuhan 430068,China;Changjiang Water Resources Protection Institute,Wuhan 430051,China;Key Laboratory of Ecological Regulation of Non-point Source Pollution in Lake and Reservoir Water Sources,Changjiang Water Resources Commission,Wuhan 430051,China;State Key Laboratory of Water Resources and Hydropower Engineering Science,Wuhan University,Wuhan 430072,China)

机构地区：[1]湖北工业大学土木建筑与环境学院,湖北武汉430068 [2]长江水资源保护科学研究院,湖北武汉430051 [3]长江水利委员会湖库水源地面源污染生态调控重点实验室,湖北武汉430051 [4]武汉大学水资源与水电工程科学国家重点实验室,湖北武汉430072

出　　处：《水电能源科学》2023年第11期111-115,共5页Water Resources and Power

基　　金：国家自然科学基金项目(U2040210)。

摘　　要：针对低流量比条件下明槽干支流交汇支流汇入区水流结构十分复杂的问题,基于物理模型试验的方法,采用PIV粒子图像测速技术观测不同交汇条件下明槽支流时均流速及三维流速空间分布,分析支流流场的变化特征。结果表明,汇流比较小时,由于干流水体的顶托作用,支流表层水体会出现不同程度上的回流现象,底层水体顺流汇入干流,且有较为明显的斜向混合界面;随着汇流比的增大,干流对支流左岸水流结构影响逐渐减小。在交汇角为30°、90°时,靠近支流右岸的水流结构受干流水体顶托作用影响最大;在交汇角为150°时,支流基本处于回流状态,交汇口处形成最大回流流速区。研究结果可为库区支流营养盐富集导致水华频发等研究提供理论支撑。Under the condition of low flow ratio,the flow structure of the inlet area of tributaries is very complicated.Based on physical model test and PIV particle image velocimetry technology,the average velocity distribution and three-dimensional velocity spatial distribution of open channel tributaries under different intersection conditions were observed,and the variation law of the flow field of tributaries was analyzed.The results show that when the confluence is relatively small,the surface water of the tributaries will have reverse reflux phenomenon to varying degrees due to the top supporting effect of the main stream water,while the bottom water flows downstream to the main stream,and there is a relatively obvious oblique mixing interface.With the increase of the confluence ratio,the influence of the main stream on the flow structure of the left bank of the tributary decreases gradually.When the intersection angle is 30° and 90°,the water flow structure near the right bank section is most affected by the water top support of the main flow.When the intersection angle is 150°,the tributaries are basically in reverse reflux state,and the maximum reflux velocity area is formed at the intersection.The results can provide theoretical support for the study of frequent bloom caused by nutrient enrichment in tributaries of reservoir area.

关 键 词：PIV 干支流交汇 流场变化 水动力特性 

分 类 号：TV131[水利工程—水力学及河流动力学]