| 挑坎体型对下游雾化影响的试验研究 |
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| 引用本文： | 练继建,冉聃颉,何军龄,张紫畅. 挑坎体型对下游雾化影响的试验研究[J]. 水科学进展, 2020, 31(2): 260-269. DOI: 10.14042/j.cnki.32.1309.2020.02.012 |
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| 作者姓名： | 练继建 冉聃颉 何军龄 张紫畅 |
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| 作者单位： | 天津大学水利工程仿真与安全国家重点实验室,天津300350;天津大学水利工程仿真与安全国家重点实验室,天津300350;天津大学水利工程仿真与安全国家重点实验室,天津300350;天津大学水利工程仿真与安全国家重点实验室,天津300350 |
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| 基金项目： | 国家自然科学基金重点联合基金资助项目U1765202 |
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| 摘 要： | 以解决挑流消能工在泄洪期间为提高消能率而加重下游雾化问题为目标,探究不同体型挑坎的下游雾化特性。通过水力学模型试验,对典型的非对称舌型坎、标准舌型坎、扭面贴坎和连续坎的下游水舌风分布、下游溅水雨强和不同液滴体积分布以及挑流水舌水力特性与冲刷特性进行了研究。研究表明:①各种工况下,非对称舌型坎、标准舌型坎、扭面贴坎的下游水舌风风速均大于连续坎。②对于非对称舌型坎,其溢洪道轴线左侧溅水强度大于右侧,其雨强左右两侧峰值差值最大为5.625 g/(m2·min);对于扭面贴坎,其溢洪道轴线右侧溅水强度更大,其雨强左右两侧峰值差值最大为45.125 g/(m2·min)。③随着距离水舌入水点长度增大,大粒径水滴数量和体积占比均剧烈下降;连续坎和舌型坎的挑宽均随着角度的增加而增加;冲坑深度随着角度的减小而增大。④在挑坎合适边墙侧设置扭面贴角能改善下游雾化危害,同时适当增加挑角可以减弱下游冲刷破坏。
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| 关 键 词： | 挑坎体型 挑流水舌 水舌风 雾化 水力学试验 |
| 收稿时间： | 2019-08-07 |
Effects of bucket type on flood discharge atomization |
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| LIAN Jijian,RAN Danjie,HE Junling,ZHANG Zichang. Effects of bucket type on flood discharge atomization[J]. Advances in Water Science, 2020, 31(2): 260-269. DOI: 10.14042/j.cnki.32.1309.2020.02.012 |
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| Authors: | LIAN Jijian RAN Danjie HE Junling ZHANG Zichang |
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| Affiliation: | State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300350, China |
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| Abstract: | The aim is to solve the problem of increasing the energy dissipation rate during the flood discharge with aggravating the downstream atomization, and to explore the influence of different flip buckets on atomization of downstream. Based on the physical model test, the downstream nappe wind distribution, the splash-water distribution, the hydraulic characteristics of trajectory nappe and the scour pattern were studied. The research shows that:① The downstream nappe wind speed of the asymmetrical tongue-shaped bucket, the standard tongue-shaped bucket and the curved surface bucket are generally larger than that of continuous bucket. ② For the asymmetrical tongue-shaped bucket, on the left side of spillway axis, the splash intensity is greater than that of the right sides. the maximum difference of the rainfall intensity between the left and right sides is 5.625 g/(m2·min). but for the distribution of curved bucket is opposite, on the right sides of spillway axis, the splash intensity is greater than that of the left sides. the maximum difference of the rainfall intensity between the left and right sides is 45.125 g/(m2·min).③ With the increase of the distance between the control point and the impinging piont, the number and the volume proportion of the large water droplets decreased sharply; with the increase of trajectory angle, both the trajectory nappe width of continuous bucket and tongue-shaped bucket are increase; and the depth of scour pool decreases with the decrease of trajectory angle. ④ When adopting the flip bucket whose curved surface is attached to the proper side wall, which can reduce the atomization influence; and the erosion damage of downstream can be reduced by increasing the trajectory angle. |
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| Keywords: | flip bucket type trajectory nappe nappe wind flood discharge atomization hydraulics test |
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