关键词: 沉沙池;沉沙率;数值计算;那苏瓦卡里水电站;尼泊尔;

Abstract: In water conservancy and hydropower projects, a grit chamber is generally used to reduce the sediment content, so as to reduce the adverse impact of the sediment on the water diversion and power generation system. It is very important to study the flow pattern of sand-containing water flow, sand depositing and sand flushing effect in the sand grit chamber. Based on a grit chamber of Rasuwagadhi Hydropower Station, using the theoretical formula, RNG k~ε turbulence model and volume resolution function VOF, we simulated the flow pattern of the two-phase flow of sediment in the grit chamber, and showed the deposition effect of different sand particle in the multi-diameter particle composition in detail. The results showed that the sand depositing efficiency of no less than 0.2mm was more than 95%, and the numerical results agreed with the theoretical calculation and met the engineering design requirements.

Key words: grit chamber; sand depositing efficiency; numerical simulation; Rasuwagadhi Hydropower Station; Nepal