平底差动坎水舌分散的研究
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摘要
结合平底差动坎物理模型试验,研究其结构参数及水力参数对其水舌分散的影响。提出水舌分散系数,通过试验观察,水舌分散系数随着来流弗氏数Fr0和结构挑角φ增大而增大,随着相对坎槽宽度b/B的增大而减小。通过数据拟合得到临界弗氏数,以此对水舌流态进行判别。与传统连续坎消能工相比,本文所提出的平底差动坎消能工的消能率可提高15%左右。
Combined with the physics model test of the differential bucket, the paper studies the influence of structural parameters and hydraulic parameters on the flow nappe dispersion,and then, the distribution coefficient of the flow nappe is proposed.Through experimental observation, the flow nappe dispersion coefficient increases with the increase of the water flow Freund number Fr0 and the structure pick angle φ, and decreases with the increase of the relative bucket groove width b/B.The critical Freund number is obtained by data fitting to discriminate the flow nappe flow state. Compared with the energy dissipator of the traditional continuous bucket, the energy dissipation rate of the differential bucket energy dissipator can be increased by about 15%.
Combined with the physics model test of the differential bucket, the paper studies the influence of structural parameters and hydraulic parameters on the flow nappe dispersion,and then, the distribution coefficient of the flow nappe is proposed.Through experimental observation, the flow nappe dispersion coefficient increases with the increase of the water flow Freund number Fr0 and the structure pick angle φ, and decreases with the increase of the relative bucket groove width b/B.The critical Freund number is obtained by data fitting to discriminate the flow nappe flow state. Compared with the energy dissipator of the traditional continuous bucket, the energy dissipation rate of the differential bucket energy dissipator can be increased by about 15%.
引文
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[4]虞佳颖,陈菊芬,陈振华,藏振涛.挑流消能预留冲刷坑的数值模拟研究[J].水利规划与设计,2018(08):93-96.
[5]尹韬,邱勇,李京蔚,罗鹏,赵丽华.基于试验研究的挑流消能机理分析[J].水利规划与设计,2017(07):103-105+165.
[2]童显武主编.高水头泄水建筑物收缩式消能工[M].北京:中国农业科技出版社,2000.
[3]Heller V,Hager W H,Minor H E. Ski jump hydraulic[J].Journal of Hydraulic Engineering,ASCE,2005(5):347-355.
[4]虞佳颖,陈菊芬,陈振华,藏振涛.挑流消能预留冲刷坑的数值模拟研究[J].水利规划与设计,2018(08):93-96.
[5]尹韬,邱勇,李京蔚,罗鹏,赵丽华.基于试验研究的挑流消能机理分析[J].水利规划与设计,2017(07):103-105+165.