高压水射流结构的红外热像特征  

Structural characterization of thermal infrared images from high pressure water jet

作　　者：宫伟力[1] 赵海燕[1] 安里千[1] 

机构地区：[1]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《实验流体力学》2008年第3期31-35,共5页Journal of Experiments in Fluid Mechanics

基　　金：国家重点基础研究发展规划(973)项目(2002CB412700)

摘　　要：对高压水射流进行了红外探测,提取了射流红外辐射温度的二维与三维特征,研究了湍射流的涡旋结构、射流分段结构及其时间演化特征。结果表明:射流大尺度涡结构呈现不规则的椭圆形,随着射流雷诺数增大,涡的尺度也不断增大;拟序结构中配对的大涡并非严格对称,其强度不同、涡的精细结构也不同;大涡可由尺度、强度、旋向不同的子涡组成;射流初始段的红外辐射温度呈线性分布、主体段呈随机分布、过渡段呈出突变的特点。High pressure water jet was detected by infrared thermographs. Infrared radiation features of water jet were extracted in two and three dimensional configuration. Structures of vortex, scale of the jet segment zones and their temporal evolution process were investigated. The results demonstrate that the large vortex configuration takes a shape of irregular ellipse and its scale is increasing along with increasing of the Reynolds number; the pairing vortices in coherent structure are not strictly symmetrical in shape, their intensity and inner structure are also different. At the same time, the large eddy may consist of sub - eddies with different scale, intensity and vortex vector. Investigations also show that the infrared thermal temperature distribution in zones of establishment flow of the jet is linear, in zones of established flow random, in zones of transition flow mutational.

关 键 词：水射流 红外热像 图像处理 湍流 拟序结构 

分 类 号：TD921.5[矿业工程—选矿] O358[理学—流体力学]