| 明渠水流自掺气对断面平均流速的影响 |
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| 引用本文： | 邓军,许唯临,曲景学,杨忠超,杨永全.明渠水流自掺气对断面平均流速的影响[J].水力发电学报,2003,84(4):88-94. |
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| 作者姓名： | 邓军 许唯临 曲景学 杨忠超 杨永全 |
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| 作者单位： | 四川大学高速水力学国家重点实验室,成都,610065 |
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| 基金项目： | 国家自然科学基金 ( 5 970 90 0 4)，四川大学青年科学研究基金 |
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| 摘 要： | 建立了求解明渠自掺气水流断面平均流速的理论公式，计算表明当气泡扩散到槽底，断面平均流速就增大，否则，掺气对断面平均流速影响不大；对断面平均流速的理论公式进行分析，从理论上说明了自掺气水流的速度分布必然存在一个自底面向水面方向不断增大，然后再逐渐减小的过程。分析了掺气对流速影响的原因，认为掺气水流断面平均流速增大主要是由于气泡进入了剪切层，导致掺气水流抗剪强度降低所致，而流速分布在上区减小是由于掺气使气体边界对速度的影响深入到了水流内部所致。
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| 关 键 词： | 水利工程基础学科 平均流速 理论分析 掺气浓度 |
| 修稿时间： | 2002年12月7日 |
The influence of aeration on average velocity of self-aerated chute flow |
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| Deng Jun,Xu Weilin,Qu Jingxue,Yang Zhongchao,Yang Yongquan.The influence of aeration on average velocity of self-aerated chute flow[J].Journal of Hydroelectric Engineering,2003,84(4):88-94. |
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| Authors: | Deng Jun Xu Weilin Qu Jingxue Yang Zhongchao Yang Yongquan |
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| Abstract: | A theoretical average velocity formula for self-aerated chute flow was established.The calculated results with the formula shows that the average velocity of self-aerated chute flow will increase remarkable when the air bubbles are diffused to the bottom of the chute,other wise the influence of aeration on average velocity of self-aerated chute flow is very limited.Analysis results from the velocity formula show that the velocity profile of self-aerated chute flow exists a peak,the velocity from the bottom increases firstly and then decreases to the surface along the vertical line.The reason of the influence of aeration was analysed and the results were drawn.When air bubbles get into the boundary layer,the shear stress with decrease,so the average velocity of self-aerated chute flow will increase.The velocity in the upper zone decreases,it is mainly because the inflence of the air boundary penetrates into the aerated flow |
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| Keywords: | basic discipline of hydraulic engineering average velocity theoretical analysis aeration concentration |
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