格栅式底流消能工掺气浓度分布规律 |
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引用本文: | 葛亚飞,邱勇,吴锦钢,周鑫宇,刘毅恒. 格栅式底流消能工掺气浓度分布规律[J]. 农业工程, 2021, 11(12): 65-69 |
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作者姓名: | 葛亚飞 邱勇 吴锦钢 周鑫宇 刘毅恒 |
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作者单位: | 云南农业大学水利学院,云南昆明650201 |
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摘 要: | 格栅能够有效改善底流消能效果,减轻或者避免消力池底板发生空蚀破坏.通过水工模型试验,研究圆孔Γ形格栅不同开孔率下栅前、栅后掺气浓度变化.试验结果有以下3个方面.①消力池附壁射流区掺气浓度纵向沿程递减,格栅附近有突变;垂直轴线方向,掺气浓度中部大两侧小,峰值出现位置和入射水股主流位置正相关;竖直方向上,1/2水深以下栅前...
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关 键 词: | 空蚀破坏 开孔率 掺气浓度 水流结构 圆孔Γ形格栅 |
Distribution Law of Aeration Concentration of Grid-type Underflow Energy Dissipater |
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Abstract: | The grid can effectively improve effect of underflow energy dissipation and reduce or avoid cavitation damage to bottom of stilling pool.Through hydraulic model tests to study changes of air-entrainment concentration before and after the grid under different opening ratios of circular-hole Γ-shaped grid.Test results were as follows.①Aeration concentration in wall jet zone of stilling pool decreased longitudinally,and there was a sudden change near the grid;in vertical axis direction,aeration concentration was large and small in the middle and two sides were small,and peak position was positively correlated with main flow of incident water stream;in vertical direction,aeration concentration below half the water depth increased significantly along the height,and then change became smaller.②With addition of the grid(opening rate 34%),aeration concentration in front of the grid at position 5 and 30 cm away from entrance of stilling pool increased sharply by 41.11% and 26.82%;grid opening rate decreased from 46% to 22%,aeration concentration on upstream side of the grid(section 6)decreased from 37.75% to 20.32%,and aeration concentration on downstream side of the grid(section 7)decreased from 20.47% to 8.78%.③After the grid was added,the minimum aeration concentration value behind the grid(near the side wall)could reach 6.06%,and flow velocity at measuring point was not large,which meant that stilling pool structure including the grid was not easy to occur cavitation damage. |
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