为在环境风洞实验中模拟污染物的扩散流场及变化情况,基于光学粒子散射理论和数字图像处理技术,并利用粒子图像测速(particle image velocimetry,PIV)技术,研制了一套具有全流场量测、非接触及低成本等特征的瞬态流场定量光学测量系统。将系统用于环境风洞模拟中,可对城市小区、街道峡谷及交通高架污染物等的扩散状况进行定性观察,还可对污染物的流场进行定量量测。可为污染物流场的理论研究、数值计算及环境规划提供参考。

Since the flow field measurement of city pollutant diffusion simulation in the environmental wind tunnel is not perfect yet,further development is needed.Using particle image velocimetry (PIV),this project,based on numerical image processing technique and optical particle scattering,aims to develop instant flow-field quantitative optical measurement and control system,which has the characteristics of non-contact,whole-field measurement,large measured area,low cost and so on.This system could not only qualitatively observe pollutant diffusion of the city biotopes,street canyons and elevated traffic,but also quantitatively measure the pollutant flow field,providing adequate data for the study on the theory of numerical calculation and environmental planning.