水利水电科技进展2017，Vol.37Issue(3)：49-54,6.DOI:10.3880/j.issn.10067647.2017.03.008
污染源位置对圆柱形水工建筑下游污染物浓度分布的影响
Effects of pollution source location on distribution of pollutant concentration downstream of cylindrical hydraulic structure
摘要
Abstract
The wake concentration fields of a cylindrical hydraulic structure with different pollution source locations ( upstream and downstream of the structure) were simulated using the Reynolds equation and RNG k-ε turbulence model. The effects of pollution source locations on the distribution of pollutant concentration downstream of the cylindrical hydraulic structure were investigated from three aspects: the time-averaged pollutant concentration, the fluctuation intensity of concentration, and the half-concentration width, which is the distance from the central line of the wake flow to the position with half of the maximum concentration. The results show that with the increase of flow path length, the transverse distribution of time-averaged pollutant concentration experienced three stages, i. e. , the bimodal structure, transition stage, and Gaussian distribution. When the pollution source was located upstream, the concentration fluctuation intensity first increased and then decreased; when the pollution source was located downstream, the concentration fluctuation intensity decreased continuously. The variation of the half-concentration width shows the same trends for the two pollution source locations:a nonlinear increase trend when 1≤x/D<15 and a linear increase trend when 15≤x/D≤30.关键词
圆柱绕流/雷诺方程/数值模拟/浓度分布/尾流Key words
flow around circular cylinder/Reynolds equation/numerical simulation/concentration distribution/wake flow分类
建筑与水利引用本文复制引用
武玉涛,任华堂,夏建新..污染源位置对圆柱形水工建筑下游污染物浓度分布的影响[J].水利水电科技进展,2017,37(3):49-54,6.基金项目
国家自然科学基金(51479218) （51479218）
一流大学与一流学科建设过渡性经费专项(1031-01601205) （1031-01601205）
