风洞模拟建筑物对大气污染物扩散影响的若干问题讨论

通过相似性分析,得到了大气污染建筑物影响风洞试验应满足的基本相似条件.由一个实例研究了利用常规风洞模拟装置和测试仪器进行大气污染建筑物影响风洞试验在技术上的可行性.结果显示:由于模拟装置和仪器条件的限制,在大多数风洞试验中存在大气边界层不完全模拟和仪器响应过慢等问题,但通过合理模拟来流的主要湍流特征和改进采样方法,可以在风洞中较真实地模拟建筑物对大气扩散的影响.

Discussion on wind-tunnel simulation of the effects of buildings on pollutant dispersion

The basic similarity requirements for the wind-tunnel simulation of building-effects on pollutant dispersion were obtained by the non-dimensional analysis of the system of equations of flow and pollutant dispersion.The availabilities of using regular passive turbulence simulation and instruments techniques for building-effects wind-tunnel experiments were studied by a pratical wind-tunnel campaign.It was concluded that the incomplete simulation of atmospheric boundary layer and slow instrument responses exist in most of wind tunnels possibly due to the limitations of simulation devices and instrument conditions,however, it is possible,by simulating the key turbulence characteristics in oncoming flow and improving the sampling procedure,to give a reasonably simulation for the effects of buildings on pollutant dispersion in a wind tunnel.