| 邓军,许唯临,曲景学,董建伟.明流泄洪隧洞中自掺气水流浓度分布及其计算[J].水利学报,2002,33(4): |
| 明流泄洪隧洞中自掺气水流浓度分布及其计算 |
| Measurement and calculation of air concentration distribution of self aerated flow in spillway tunnel |
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| DOI： |
| 中文关键词: 自掺气水流 掺气浓度 泄洪隧洞 洞顶余幅 |
| 英文关键词: self aerated flow air concentration spillway tunnel remaining height |
| 基金项目: |
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| 中文摘要: |
| 通过对明渠和明流隧洞中自掺气水流的对比试验，研究了明流隧洞中洞顶的存在对掺气浓度分布的影响。试验结果表明：洞顶的存在可导致洞顶附近掺气浓度分布随高度的增加而减小的情况，同时，在水点跃移区的中上部高含气段，掺气浓度亦有所减小，甚至全断面掺气浓度均低于99%.根据有无顶盖时水点通量守恒的条件，建立了一个计算明流泄洪隧洞中自掺气水流掺气浓度分布的理论公式，并在适当的假设前提下，对公式作了简化并对洞高分别为9cm和10cm情况下，不同流量、不同余幅的掺气浓度进行了计算，计算结果与试验资料吻合较好。 |
| 英文摘要: |
| The effect of tunnel ceiling on air concentration distribution is studied experimentally.The measurement shows that air concentration decreases with the increase of elevation in the vicinity of ceiling.Besides,air concentration in water drop zone will be reduced and the maximum air concentration along the vertical line may be lower than 99%.A theoretical formula is establishedfor calculating the air concentration of self aerated flow in spillway tunnel.A simplified formula for air concentration based on reasonable assumption is proposed.The validity of the calculation is verified by experiments. |
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