小底坡泄洪洞突扩突跌掺气坎水力特性

发布时间：2018-06-23 00:14

  本文选题：小底坡 + 突扩突跌　； 参考：《水力发电学报》2017年07期

【摘要】：小底坡条件下,在高水头有压弧形门后采用突扩突跌体型兼作掺气措施使用时,掺气空腔容易积水,而且主流水舌受侧墙挤压后越出水面,形成较高折冲水翅现象。采用流动特征分析与模型试验相结合的方法,认为空腔积水及折冲水翅的主要原因是两个"积水源"和一个"退水机制",强调了使射流冲击角最小化对空腔稳定及消除水翅问题起关键作用。在试验结构优化及对比分析的基础上,给出一种局部变坡消退空腔积水及改善折冲水翅的方法,同时探讨了底空腔及侧空腔的相互关系以及掺气效果的影响因素。结合具体工程,验证了优化体型沿程掺气浓度及对运行水头的适应能力。
[Abstract]:Under the condition of small bottom slope, the aeration cavity is easy to accumulate water and the mainstream water tongue can cross the water surface after the pressure arc door with high head, when the sudden expansion and falling shape are used as aeration measures, and the mainstream water tongue is extruded by the side wall, which forms the phenomenon of high flushing wings. Using the method of flow characteristic analysis and model test, It is considered that the main causes of cavity hydrops and flushing wings are two "water sources" and one "water receding mechanism". It is emphasized that minimizing jet impingement angle plays a key role in cavity stability and eliminating water wing problem. On the basis of experimental structure optimization and comparative analysis, this paper presents a method of local variable slope regression of cavity hydrops and improvement of flushing wing, and also discusses the relationship between bottom cavity and side cavity and the influence factors of aeration effect. Combined with the concrete project, the optimized aeration concentration along the range and the adaptability to the running head are verified.
【作者单位】： 南京水利科学研究院水文水资源与水利工程科学国家重点实验室;河海大学水利水电学院;
【基金】：国家自然科学基金(51379128) 国家国际科技合作专项(2015DFA01000)
【分类号】：TV135.2
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本文编号：2054851