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结合我国排放口设计的发展方向，通过数值模拟方法研究了竖管式多孔扩散器排放近区的稀释特性和数值预报模型。针对前人二维当量长孔浮射流理论不能考虑扩散器附近单个浮射流的混合特征的不足之处，提出了多孔浮射流混合前后的耦合模拟方法，建立了竖管式扩散器排放近区单侧混合的数值模型，并通过模型试验加以验证。结果表明，数值计算成果与模型试验成果基本一致，可以直接用于竖管式扩散器表层初始稀释度的预报。
Combining with the development direction of China’s vent outlet design, numerical simulation methods were used to study the dilution characteristics and numerical prediction model of the near-zone discharge of the riser porous diffuser. For the former two-dimensional equivalent long-hole floating jet theory can not consider the shortcomings of the mixing characteristics of a single floating jet near the diffuser, a coupling simulation method before and after the mixing of the porous floating jet is proposed, and the discharge of the near-end diffuser discharge near zone is established. A side-mixed numerical model was verified by model tests. The results show that the numerical calculation results are basically consistent with the model test results and can be directly used for the prediction of the initial dilution of the surface diffusion tube.