应用折射率匹配技术测量复杂形状通道内的液体流场  

Liquid Velocity Measurements in Complex Geometries Using Refractive Index Matching Technique

作　　者：张超杰[1] 张鸣远[1] 卢勇[1] 孟桂祥[1] 杨建[1] 苏玉亮[1] 

机构地区：[1]西安交通大学能源与动力工程学院,西安710049

出　　处：《西安交通大学学报》2002年第11期1125-1128,共4页Journal of Xi'an Jiaotong University

基　　金：国家自然科学基金资助项目 (5 9995 46 0 ) ;国家振兴教育行动计划流体机械及工程项目

摘　　要：通过折射率匹配方法 ,应用激光多普勒测速仪测量了突缩与分叉复合管内的液体流场 .采用石英玻璃制作实验段 ,苯甲醇和乙醇的混合溶液作为流动工质 ,适当调配两种溶液的混合比例 ,使液体工质和固体壁面具有相同的折射率 ,均为 1 4 5 8,消除了壁面对测量光线的折射影响 ,拓宽了激光多普勒测速仪的应用范围 ,提高了测量精度 .测量结果表明 ,在汇流区域的下游 ,在两根管道轴线组成的水平面内 ,主流速度分布呈双峰状 ,其中较大的峰值偏向主管中正对旁路的壁面一侧 .在铅垂平面内 ,轴向速度分布呈“M”型 .The liquid flow field in a tube with a combination of a stenosis and a bifurcation was measured by using refractive index matching technique. The test section was made of quartz glass tube with a refractive index of 1.458, and a mixture of 54% benzyl alcohol and 46% ethyl alcohol with the same refractive index as that of quartz glass was chosen as working fluid, so that the effect of refraction on the tube wall was successfully eliminated. Velocity profiles upstream and downstream the bifurcation were measured with a laser Doppler anemometer (LDA), and a skewed double-peak velocity distribution was found downstream the bifurcation. The obtained data are more complete and accurate.

关 键 词：复杂形状通道 液体流场 激光多普勒测速仪 折射率匹配技术 流场测量 测量原理 

分 类 号：TK313[动力工程及工程热物理—热能工程]