考虑动量和浮力通量耗散的烟气抬升解析模式

An Analytic Model Considering Dissipation of Momentum and Buyancy Flux for Plume Rise

环流湍流对烟流抬升有重要的作用。本文考虑了环境湍流引起的烟流的动量和浮力通量耗散，导出了烟流抬升的控制方程，给出了烟流的轨迹方程和中性条件下热浮力烟流的终极抬升高度。在烟囱附近，轨迹方程接近２／３次律；当下风距离增大时，与２／３次律有明显偏离并逐渐变平。与外场试验资料的比较表明，本模式能较好地模拟浮力烟流的轨迹和终极高度。

Ambient turbulence has an important effect on plume rise. in this paper, considering the dissipation of plume momentum and buoyancy by ambient turbulence, we derive the governing equation of the bent-voer plume and give the trajectory equation and the final rise height formula of buoyant plume under neutral conditions. Near the stack, the trajectory equation is approximately the two-thirds law,whereas as the downwind distance becomes larger, the trajectory is depart from that the law appreciably and levels off gradually. Compared to the field experiments, this model simulates well the final rise as well as the trajectory of buoyant plumes.