渐扩段水流紊动特性试验研究  

Experimental study of turbulence characteristics of flow in divergent channel

作　　者：童思陈[1] 王亮[1] 郭荣[1] 

机构地区：[1]重庆交通大学国家内河航道整治工程技术研究中心,重庆400074

出　　处：《水力发电学报》2013年第5期109-114,共6页Journal of Hydroelectric Engineering

基　　金：国家科技支撑计划资助项目(2012BAB05B03);重庆市科委自然基金项目(CSTC;2010BB7271);重庆交通大学水利水运工程教育部重点实验室开放基金项目(SLK2010B02)

摘　　要：本文建立了由束窄段、渐扩段和放宽段组成的概化水槽试验,采用三维声学多普勒流速仪(ADV)对水流三维流速进行了采集,重点针对渐扩段水流的紊动强度、雷诺应力、脉动流速的概率分布密度、相关系数及紊动能等进行了较为深入的研究。结果表明,水流从束窄段流经渐扩段直至放宽段的过程中,水流的紊动逐渐增强至渐扩段进口达到最大,而后逐渐减小并恢复至来流状态。其中,在渐扩段进口相对水深为0.8层紊动最为强烈。本研究为进一步探讨渐扩段水流的紊动结构及输沙特性奠定了一定的基础。A generalized experiment was conducted in a flume composed of a narrow section, divergent section and wide section to study turbulence intensity, Reynolds stress, probability density functions of fluctuating velocity, correlation coefficient and turbulence energy, focusing on the divergent section. Flow velocity was measured by means of acoustic Doppler velocimeter （ADV） for 3D flow characteristics. Results show that turbulence intensity increases from the narrow section to the divergent section, and then gradually decreases from the divergent to wide section, achieving a peak at relative depth 0.2 of the divergent section inlet. This study provides a basis for further study of turbulence and sediment transport natures in divergent channel flow.

关 键 词：水力学 渐扩段 紊动特性 概化水槽 试验研究 

分 类 号：TV131[水利工程—水力学及河流动力学]