强浮升烟流终极抬升高度的确定

THE DETERMINATION OF FINAL RISE HEIGHT OF STRONG BUOYANT PLUMES

对强浮升烟流,采用通常意义上确定的抬升高度计算污染物浓度分布尤其是地面最大浓度会造成较大的误差。我们认为此时应取地面浓度达最大值处为烟流抬升的截止点。在这一假设条件下,本文得出了强浮升烟流的终极抬升高度计算公式和地面最大浓度距离计算公式。美国PPSP试验资料验证了我们的主要结论。

For (he strong buoyant plumes, if the final rise height is determined according to the usually used meaning, the calculated concentration field especially the maximum ground-level concentration will be resulted in some larger error. In this condition, we suggest that the plume rise should be terminated at Xm at which maximum ground-level concentration occurs. Under such hypothesis we have developed formula to calculate the final rise height and distance of maximum ground-level concentration. The PPSP field data in United States have justified our main conclusions.