摘要
弯道形态的设计和量测手段的选择是弯道紊动特性试验的关键问题。现有的试验研究对弯道水流的认识基本上局限于水流的核心区域,对水面、边壁附近的紊流特性研究较少,且很多都是针对单一弯道水流结构的研究,对天然河流中常见的连续弯道形态中的流动结构研究较为缺乏。为此,设计了一种接近于河湾形态的连续弯道水槽,采用电磁流速仪测量连续变方向急弯模型上各个断面上各点的瞬时流速值,并确定了试验所需的各种参数。试验量测所得的结果可用于研究弯道水流紊动特性和断面二次流形态、验证数值模型等。
The layout of the flume bend and the selection of measuring device are of crucial importance to experimental study on bend flow.Previous investigators mostly used a simple bend in such experiments and their measurements were limited only to the mean velocities.In the experiment,a flume of consecutive bends was designed and a three-dimensional（3D） electromagnetic current meter was used for detailed measurements of the structure of turbulent flow in channel bends.Different patterns of secondary flow were obtained at various cross-sections in the bends.
出处
《实验技术与管理》
CAS
北大核心
2010年第10期87-90,共4页
Experimental Technology and Management
基金
国家自然科学基金(50979043)
水沙科学与水利水电工程国家重点试验室基金(2009-TC-2)
关键词
连续弯道
紊动结构
电磁流速仪
二次流
consecutive bends
turbulent characteristics
electromagnetic flow-velocity meter
secondary flow
