| 摘要: |
| 计算水流的恢复距离可以知道下游引航道口门区的通航水流条件是否受到了上游电站在不同泄流工况下的影响，进而可为电站的调度运行提供参考。本文以景洪电站为研究背景，分析了纯发电、控泄发电及敞泄停机这三种工况下的水流沿程分布情况，并与无坝全断面泄流工况的水流沿程分布情况进行了比较，提出了水流恢复距离的概念，计算了不同工况下的水流恢复距离。结果表明，两侧泄流的恢复距离均大于中段泄流的恢复距离，泄流宽度所占的比例越大，恢复距离越短，泄流流量越大，恢复距离越长。通过对全断面泄流工况和极限泄流工况在引航道口门区水流条件的对比可知，当水流恢复距离大于引航道的长度时，相对应的泄流工况会造成引航道口门区的水流条件明显的变化，此时需要考虑电站泄流对下游通航的影响。 |
| 关键词: 关 键 词：复杂边界 分散泄流 全断面泄流 恢复长度 数值模拟 |
| DOI： |
| 分类号:U642 |
| 基金项目: |
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| Study on the Flow Recovery Distance under Different Discharge Conditions of Hdro-junction |
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Jiang Ziwei1,2, Xu Guangxiang1,2
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1.School of River &2.Ocean Engineering,Chongqing Jiaotong University
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| Abstract: |
| By calculating the recovery distance of water flow, it can be known whether the navigable flow condition in the downstream approach entrance area is affected by the upstream power station under different discharge conditions, which can provide a reference for the dispatching operation of the power station. Takeing Jinghong Hydropower Station as the research background, this paper analyses the flow distribution along the river under three conditions: pure power generation, controlled discharge power generation and open-discharge shutdown, and it compared with the flow distribution under the condition of full sectional discharge without dam. The concept of flow recovery distance is put forward, and the flow recovery distance under different conditions is calculated. The results show that the recovery distance of both sides is larger than that of the middle section. The larger the proportion of discharge width, the shorter the recovery distance, the larger the discharge, the longer the recovery distance. By comparing the flow conditions in the approach entrance area under the full sectional discharge and the limit discharge condition, it can be seen that when the water recovery distance is greater than the length of the approach channel, the flow conditions in the approach entrance area will obviously change under the corresponding discharge condition, then the influence of the discharge from the power station on the downstream navigation should be considered. |
| Key words: Complicated boundary Dispersed discharge Full sectional discharge Recovery distance Numerical simulation |
