| 静止环境中有阻力圆盘浮力射流特性的研究——(II)流场特性分析 |
| |
| 引用本文： | 方神光,槐文信.静止环境中有阻力圆盘浮力射流特性的研究——(II)流场特性分析[J].水科学进展,2004(5). |
| |
| 作者姓名： | 方神光 槐文信 |
| |
| 作者单位： | 武汉大学水资源与水电工程科学国家重点实验室，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，湖北武汉 430072 |
| |
| 基金项目： | 教育部优秀教师资助计划资助项目(2003 99)~~ |
| |
| 摘 要： | 在数值计算成果的基础上,对阻力圆盘浮力射流的流场进行了分析和总结,基于轴线流速的变化规律将盘后流场分为3个区域:回流区、过渡区和自相似区。得到了回流区的长度随弗劳德数F0、孔口直径D/d以及盘离孔口的距离H/d的变化规律,并得到了工况为H/D=1,D/d=2,6和H/D=3,D/d=2在不同弗劳德数F0条件下的横截面上的流速分布和达到自相似区的最小长度;结果表明弗劳德数F0的大小是决定绕流流态的主要因素;同时分析了由正常绕流发展到非正常绕流的压力场变化,发现由于弗劳德数F0的增大而导致流场中出现的第三个负压中心的大小和位置与绕流是否能正常发生存在密切的关系。
|
| 关 键 词： | 浮力射流 回流区 轴线流速 压力场 流场 静止环境 阻力圆盘 |
Research on the behavior of obstructed round buoyant vertical jets in static ambient, 2, analysis on the behavior of flow field |
| |
| FANG Shen-guang,HUAI Wen-xin.Research on the behavior of obstructed round buoyant vertical jets in static ambient, 2, analysis on the behavior of flow field[J].Advances in Water Science,2004(5). |
| |
| Authors: | FANG Shen-guang HUAI Wen-xin |
| |
| Abstract: | Based on a series of numerical calculations, the behavior of flow field in obstructed round buoyant vertical jet is summarized and analyzed. Based on the axial line velocity distribution, the flow after the disc can be divided into three regions: i.e. recirculation region, transitional region and self-similar region. The laws of the length of recirculation region varying with Froude number F_0, port diameter D/d and the distance H/d of the disc from the port are got. The velocity distribution charts in cross sections and the least length from the disc needed for reaching self-similar area in different Froude number under three different conditions of H/D=1,D/d=2,6 and H/D=3,D/d=2 are also obtained. And it is found that Froude number is the key factor to decide which flowing pattern in the field. The pressure distribution changing in the flow area for three kinds of flow patterns is ana lyzed and it is found that the magnitude and location of the third negative pressure center caused by the increase of Froude number are closely related to flow patterns. |
| |
| Keywords: | buoyant jets recirculation region axial velocity pressure field flow field static ambient obstructed round |
| 本文献已被 CNKI 等数据库收录！ |
