采用激光衍射瞬时浓度场测量系统和图像处理系统,对不同高架与周围建筑高度比下污染点源绕建筑对流扩散进行了风洞实验.Fluent双相耦合模型与实验进行了相互校核,得到了建筑的各个高度层面污染分布、不同高度比下的污染扩散及污染分布随时间变化的规律.不同高度比对污染对流扩散具有明显的影响,建筑各高度层面污染浓度分布也存在明显差别.当高度比较小时,污染将堆积在建筑物底层.污染分布随时间变化有助于了解污染对流扩散的时间效应.结果可以为高架与周围建筑规划提供参考与依据.
Wind tunnel experiment was carried out to investigate the diffusion and dispersion of point source air pollution distribution in different heights of surrounding over-head roads and buildings.Laser Diffraction Instantaneous Pollutant Concentration Field Measurement System and Image Processing System were employed.Numerical simulation using Fluent and two-phase couple model was carried out,(1)Pollutant distribution in different heights of the building;(2)Pollutant dispersion in different height of the building;(3)Temporal variation of the pollutant distribution,were obtained and compared with the experiment.The result showed that:Height has significant effect on the diffusion and dispersion of the pollutant;obvious difference can be observed in the pollutant concentration distribution in different heights.Pollutant will tend to accumulate in the bottom of the building when the height ratio is small.Temporal variation of the pollutant concentration distribution can help understanding the time effect of the pollutant diffusion and dispersion,and the result of this paper can serve as a reference in planning of the construction of the over-head road and surrounding buildings.
参考文献
| [1] | MURAKAMI S .Current Status and Future Trends Im Computational wind Engineerining[J].Journal of Wind Engineering and Industrial Aerodynamics,1997,67/68:3-34. |
| [2] | Ping H et al.Numerical Simulation of Air Flow in a Urban Area with Regularly Alignad Blocks[J].Journal of Wind Engineering and Industrial Aerodynamics,1997,67:281-291. |
| [3] | 吴文权.流体绕多个钝体不稳定分离流动数值仿真[J].华东工业大学学报,1997(03):1. |
| [4] | 王远成,吴文权,黄远东,卢曦.建筑物周围绕流流场的三维数值模拟[J].工程热物理学报,2004(02):235-237. |
| [5] | H G C Woo;J A Peterka;J E Cermak .Wind Tunnel Measurements in the Wakes of Structures NASA-CR-2806,N77-19716[R].,1977. |
| [6] | Liedtke J;Leitl B;Schatzmann M.Dispersion in a Street Canyon:Comparison of Wind Tunnel Experiments with eld Measurements[A].Southampton:WIT Press,1999:806-810. |
| [7] | Michael Schatzmann;Bernd Leitl;Joachim Liedtke .DISPERSION IN URBAN ENVIRONMENTS Comparison of field measurements with wind tunnel results[J].Environmental Monitoring and Assessment: An International Journal,2000(1/2):249-257. |
| [8] | Gui L.;Fei R.;Merzkirch W. .A digital mask technique for reducing the bias error of the correlation-based PIV interrogation algorithm[J].Experiments in Fluids: Experimental Methods and Their Applications to Fluid Flow,2000(1):30-35. |
| [9] | Meinhart C.D.;Zhang H. .The flow structure inside a microfabricated inkjet printhead[J].Journal of Microelectromechanical Systems: A Joint IEEE and ASME Publication on Microstructures, Microactuators, Microsensors, and Microsystems,2000(1):67-75. |
| [10] | 卢曦,吴文权.瞬时浓度场的激光片光测量研究[J].工程热物理学报,2005(04):587-589. |
| [11] | 卢曦,李宋,吴文权.污染扩散瞬时浓度场测量方法的研究[J].计量学报,2006(01):84-87. |
| [12] | 李宋,吴文权,程云章.不稳定浓度场的非线性特征实验研究[J].工程热物理学报,2006(04):592-594. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%