| 一种新型掺气设施的试验研究 |
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| 引用本文： | 牛争鸣,南军虎,洪镝.一种新型掺气设施的试验研究[J].水科学进展,2013,24(3):372-378. |
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| 作者姓名： | 牛争鸣 南军虎 洪镝 |
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| 作者单位： | 1.西安理工大学水利水电学院,陕西西安 710048; |
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| 基金项目： | 陕西省重点学科建设专项资金资助项目(00X901);国家自然科学基金资助项目(51166008)~~ |
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| 摘 要： | 设置在泄洪洞竖井内的环形掺气设施是不同于传统掺气技术的新创意。为了更好地认识这种新型的掺气技术,基于公伯峡水平旋流泄洪洞原型和模型试验,对环形掺气坎的通风和掺气特性进行了研究。结果表明环形通气孔的通风是由通气孔进出口的压差引起的,通风量与相对空腔长度的关系服从线性分布;环形掺气坎掺气减蚀的作用明显,其掺气是由于射流冲击竖井水体形成大尺度旋涡并挟带气泡所致,且掺气浓度沿高程呈乘幂分布;模型通风和掺气特性的缩尺效应明显。在结构设计满足要求的前提下,有必要在旋流泄洪洞的竖井段设置掺气设施,可改善水流流态,并增加消能效果。
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| 关 键 词： | 竖井 环形掺气坎 通风 掺气 水力特性 |
| 收稿时间： | 2012-04-17 |
An experimental study on hydraulic characteristics of a novel aerator |
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| NIU Zhengming,NAN Junhu,HONG Di.An experimental study on hydraulic characteristics of a novel aerator[J].Advances in Water Science,2013,24(3):372-378. |
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| Authors: | NIU Zhengming NAN Junhu HONG Di |
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| Institution: | 1.Institute of Water Resources and Hydro-electric Engineering Xi'an University of Technology, Xi'an 710048, China;2.School of Energy and Power Engineering Lanzhou University of Technology,Lanzhou 730050, China;3.Yellow River Upstream Hydropower Limited Liability Company, Xining 810209, China |
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| Abstract: | The use of an annularaerator placing in the vertical shaft of flood discharge tunnel is a new engineering idea, and is different from the traditional ones.In order to better understand this new type of technology, the ventilation and aeration characteristics of the annular aerator are studied based on the prototype and modeling experiments carried out in the gyrating discharge tunnel of the Gongboxia Hydropower Project.The results show that the ventilation is caused by the pressure difference of air vents.The relationship between the ventilation and relative cavity length follows the linear distribution.The aeration effect on the annular aerator is obvious.The jet is striking water in the shaft, and then a large-scale aerated vortex is generated with bubbles thereby contributing to the aeration forming.The aeration concentration presents a power distribution in the vertical shaft.The ventilation and aeration scale effects of models are both obvious.Therefore, the use of an annular aerator is necessary to set in the vertical shaft of gyrating discharge tunnel while satisfying the structural designs demands, which can improve the flow pattern and increase the energy dissipation significantly. |
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| Keywords: | vertical shaft annular aerator ventilation aeration hydraulic characteristic |
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