河流中单向性同流扩散器近区的稀释

Dilution Analysis for near Field of Unidirectional Diffusers in River

用三维湍浮力流模式结合混合有限分析法对河流中单向性同流扩散器的近区稀释特性进行精确的数值分析，所得结果与Ｐａｒｒ的试验资料吻合良好，进而给出了稀释度在近区的经验公式，并且分析了浮力射流的分叉现象和吸附现象以及出现这两种现象的原因，发现水面对稀释有延迟作用，对分叉有促进作用。

This paper simulates the mixing mechanics of submerged, multi port diffusers used to discharge heated water from stream electric power plants, and households into shallow receiving waters. The 3 dimensional turbulence modelling and the hybrid finite analytic method are used to predict the dilution behavior of near field for multiple jets in river. The predicted dilutions are good by comparision with available laboratory measureents. A empirical formula for temperaturs dilution in near fields for this kinds is given. It is very interesting that there are bifurcation and Coanda effect in this kind flow.