折板式竖井折板间隔对水流水力特性影响分析

摘要:

为研究折板间隔对折板式竖井内水流的水力特性影响，采用Realizable k-?模型结合VOF模型对不同折板间隔的竖井进行数值计算。结果表明：折板间隔是竖井较为关键的影响因素；随着折板间隔的增大，折板上水流流态会从往复跌水流逐渐过渡为S型贴壁流，折板或壁面受到的冲击以及冲刷作用也会逐渐增大；无论折板上水流流态为往复跌水流，还是S型贴壁流，竖井消能率基本都在90%以上，受折板间隔影响较小。

Abstract:

The Realizable k-? model combined with the VOF multi-phase model was applied to the numerical simulation for three groups of baffle-drop shaft to study the effect of baffle spacing on hydraulic parameter. The results indicated that baffle spacing is the key factor in the baffle-drop shaft. With the increase of the folded plate spacing, the flow pattern on the folded plate will gradually change from reciprocating flow to S-type wall flow, and the impact and erosion on the folded plate or wall will also increase. Whether the flow pattern on the folded plate is reciprocating flow or S-type flow, the energy dissipation is above 90%, and the baffle spacing has little effect on the energy dissipation in the shaft.