为在大型环境风洞中模拟大气污染物迁移扩散状况,开发出污染物浓度激光片光测量系统和污染物发放系统。基于激光片光浓度场测量系统,风洞模拟得到城市环境下点、线和面源污染物的扩散分布图案。基于风洞试验工况的边界条件,计算流体动力学(CFD)仿真得到污染物扩散分布,CFD仿真结果和激光片光浓度测量结果,两者定性一致,达到了相互印证的效果。将研究开发的激光片光浓度场测量系统和定量采样方法相结合,有望实现风洞试验中污染物浓度场的定量测试。

In order to perform wind tunnel experimental studies on pollutant dispersion, a laser sheet light system for measuring pollutant concentration fields and a pollutant releasing system were developed. Based on the laser sheet light system for concentration measurement, the distribution patterns of pollutants released respectively from point, line and face sources under urban environments were investigated by wind tunnel experiments. Based on the boundary conditions in the wind tunnel test case, the pollutant dispersion was simulated numerically by computational fluid dynamics (CFD). The CFD results are qualitatively matched the laser sheet concentration measurements in the wind tunnel. By combining the laser sheet light system for concentration field measurement with the concentration sampling method, it will be expected to realize the quantitative measurement of pollutant concentration fields in wind tunnel modeling.