内陆核电厂冷却塔对周围大气流动和污染物扩散影响的风洞实验研究

Wind Tunnel Experimental Study on Effect of Inland Nuclear Power Plant Cooling Tower on Air Flow and Dispersion of Pollutant

介绍了桃花江核电厂冷却塔对周围大气流动和污染物扩散影响的风洞模拟实验。以厂址为中心,应用X型热线探头探测了冷却塔等建筑群周围大气的平均流场和湍流结构,用示踪扩散实验法研究冷却塔及其所排热羽对烟囱排放污染物扩散的影响。结果表明,冷却塔对周围大气流动和污染物扩散的影响程度与烟囱和冷却塔的相对位置密切相关,风向与烟囱和冷却塔的连线平行时,受影响尤为显著。冷却塔尾流中最大速度亏损和纵向湍强扰动衰减的变化规律与Arya和Gadiyaram的相应研究有一定的差异,但两者的变化规律基本一致。冷却塔及其热羽使得近场污染物扩散显著增强,并改变了烟羽的运动轨迹。同时,冷却塔所排热羽对污染物扩散的影响还与释放源和冷却塔的相对高度有关。

A wind tunnel experiment for the effect of the cooling tower at Taohuajiang nuclear power plant on air flow and dispersion of pollutant was introduced in paper. Measurements of air mean flow and turbulence structure in different directions of cooling tower and other buildings were made by using an X-array hot wire probe. The effects of the cooling tower and its drift on dispersion of pollutant from the stack were investigated through tracer experiments. The results show that the effect of cooling tower on flow and dispersion obviously depends on the relative position of stack to cooling towers, especially significant for the cooling tower parallel to stack along wind direction. The variation law of normalized maximum velocity deficit and perturbations in longitudinal turbulent intensity in cooling tower wake was highly in accordance with the result of isolated mountain measured by Arya and Gadiyaram. Dispersion of pollutant in near field is significantly enhanced and plume trajectory is changed due to the cooling towers and its drift. Meanwhile, the effect of cooling tower on dispersion of pollutant depends on the height of release.