摘要
折板是折板消能竖井的关键结构。本文以模型试验为依托,测试了折板消能竖井的水力特性,分析了不同典型位置折板的功能及布置准则,结果显示：首层折板的主要功能为承接和调节水流,使其平顺地跌向次层折板,首层折板与竖井入流口的间距是影响首层折板功能发挥的主要因素,该值过大易引起水流不能跌至首层折板或水流直接冲击中隔板等不利现象;中间层折板的主要功能为消能,折板间距是影响其功能发挥的主要因素,折板间距过大会影响消能效率,过小会影响过流能力;水下折板的主要功能为消能和除气,根据试验资料,当水下折板至少设置2~3层时,即可良好地满足其功能需求。
The baffles are the key structure of the baffle-drop shafts. With the help of physical model tests, the flow patterns in the baffle-drop shafts were tested, and the functions of the baffles with its de- signing considerations were analyzed. The results were shown as follows：the top baffle was designed for car- rying and adjusting inflow, then making it flow down to the second baffle naturally. The distance between the top baffle and the shaft inlet was the chief factor which influences the top baffle arrangement and its too large evaluating could make the flow strike on the central dividing wall or the second baffle directly. The main baffles lying between the top baffle and the bottom water surface were designed for energy dissi- pation. Baffle spacing would be the chief influence factor; being too large would reduce energy dissipation while being too small would influence the flow capacity. The functions of underwater baffles were energy dis- sipation and de-aeration. According to the test results, 2-3 baffles could meet the requirements.
出处
《中国水利水电科学研究院学报》
北大核心
2015年第4期270-276,共7页
Journal of China Institute of Water Resources and Hydropower Research
基金
中国水利水电科学研究院科研专项(HY0145B16201500000)
国家自然科学基金项目(51279216)
关键词
折板功能
模型试验
折板消能竖井
工程水力学
baffle function
physical model test
baffle-drop shaft
engineering hydraulics
