
Research on the Optimization of Gradual Expanding Stilling Basin
Zhi-ya HE, Peng-peng XIANG, Zhang-hua HONG, Wen-chao LIU
Research on the Optimization of Gradual Expanding Stilling Basin
In the hydraulic model test of Edie reservoir, it was found that the repelled downstream hydraulic jump occurred in the gradual expanding stilling basin, and the flow state was poor, which could not meet the requirements of energy dissipation and scouring prevention. In order to solve this problem, numerical analysis software FLOW-3D was used to explore the influence of the body type parameters of the gradual expanding stilling basin on the flow state, inundation degree, energy dissipation rate and so on in the stilling basin, The results show that: for the gradual expanding stilling basin with the repelled downstream hydraulic jump, increasing the height of the tail can significantly improve the inundation degree, the appropriate height of the tail sill can not only improve the flow state in the stilling basin, but also control the energy dissipation rate to a reasonable range; the increase of diffusion angle and pool length has little effect on the inundation degree and energy dissipation rate and is not beneficial to improving the flow state. Based on the results, a reasonable shape parameters was recommended and verified by physical model. The research results can provide a reference for design optimization in the same type of engineering.
stilling basin / FLOW-3D / numerical simulation / model test {{custom_keyword}} /
Tab.1 Body parameters of different combinations of the stilling basin表1 不同组合消力池体型参数 |
组次 | 扩散角/(°) | 池长/m | 尾坎高/m | 影响因素 |
---|---|---|---|---|
1 | 3.0 | 38 | 0 | |
2 | 3.5 | 38 | 0 | 扩散角 |
3 | 4.0 | 38 | 0 | |
4 | 3.0 | 39 | 0 | 池长 |
5 | 3.0 | 40 | 0 | |
6 | 3.0 | 41 | 0 | |
7 | 3.0 | 38 | 0.5 |
尾坎高度 |
8 | 3.0 | 38 | 1.0 | |
9 | 3.0 | 38 | 1.5 |
Tab.2 Comparison between numerical model and physical model data表2 数值模型与物理模型数据对照表 |
参数 | 消力池进口 | 跃前断面 | 跃后断面 | 消力池出口 | ||||||
---|---|---|---|---|---|---|---|---|---|---|
水深/ m | 流速/ (m·s-1) | 水深/ m | 位置 | 流速/ (m·s-1) | 水深/ m | 位置 | 流速/ (m·s-1) | 水深/ m | 流速/ (m·s-1) | |
数值模型 | 0.84 | 20.89 | 1.27 | 9.20 | 20.51 | 6.20 | 32.50 | 2.73 | 5.92 | 3.02 |
物理模型 | 0.80 | 22.75 | 1.43 | 9.53 | 21.35 | 6.19 | 34.33 | 4.32 | 6.19 | 3.15 |
Tab.3 Flow velocity and characteristic hydraulic parameters of each scheme表3 各组次方案流速及特征水力参数 |
组次 | 入池流速/ (m·s-1) | 收缩断面 | 跃前断面 | 出池流速/ (m·s-1) | ||||
---|---|---|---|---|---|---|---|---|
流速/(m·s-1) | 水深/m | Froude数 | 流速/(m·s-1) | 水深/m | Froude数 | |||
第1组 | 20.89 | 21.95 | 0.66 | 8.63 | 20.51 | 1.27 | 5.81 | 3.02 |
第2组 | 21.39 | 22.09 | 0.64 | 8.82 | 21.70 | 1.23 | 6.25 | 2.86 |
第3组 | 20.95 | 21.58 | 0.63 | 8.68 | 20.32 | 1.12 | 6.13 | 2.62 |
第4组 | 21.39 | 22.07 | 0.58 | 9.26 | 21.18 | 1.29 | 5.96 | 3.38 |
第5组 | 20.95 | 22.10 | 0.57 | 9.35 | 18.91 | 1.37 | 5.16 | 3.97 |
第6组 | 20.96 | 21.35 | 0.55 | 9.20 | 17.79 | 1.25 | 5.08 | 4.04 |
第7组 | 21.38 | 22.07 | 0.74 | 8.20 | 20.56 | 1.29 | 5.78 | 6.60 |
第8组 | 21.38 | 22.01 | 0.87 | 7.54 | 20.68 | 1.32 | 5.75 | 5.73 |
第9组 | 17.04 | 22.34 | 0.92 | 7.44 | 21.37 | 1.30 | 5.99 | 6.46 |
Tab.4 Energy dissipation rate and submergence degree of water jump of each schemes表4 各组次方案消力池水跃消能率及淹没度 |
组次 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
---|---|---|---|---|---|---|---|---|---|
水跃消能率/% | 70.72 | 71.45 | 72.26 | 71.27 | 71.48 | 72.35 | 71.15 | 68.48 | 65.50 |
淹没度 | 0.83 | 0.84 | 0.84 | 0.81 | 0.81 | 0.80 | 0.87 | 1.08 | 1.27 |
Tab.5 Characteristic parameters of hydraulic jump in stilling basin表5 消力池水跃特征参数 |
工况 | 参 数 | |||||
---|---|---|---|---|---|---|
收缩断面流速/(m·s-1) | 收缩断面Froude数 | 跃后水深实测值/m | 池末水深hT /m | 淹没系数 | 水跃消能率/% | |
消能防冲水位 | 23.10 | 8.56 | 6.05 | 6.69 | 1.11 | 68.4 |
设计水位 | 24.76 | 8.95 | 6.51 | 7.56 | 1.16 | 58.5 |
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