高流速、大流量无压洞掺气设施体形优化模型试验研究
Model Test on Shape Optimization of Air Entraining Facilities in Free Flow Tunnel with High Flow Rate and Large Flow Rate
郝杰 1郝爱君2
作者信息
- 1. 新疆水利水电勘测设计研究院有限责任公司,新疆 乌鲁木齐 830000
- 2. 吉林水利电力职业学院,吉林 长春 130117
- 折叠
摘要
高水头、大流量、高流速的泄水建筑物,往往需要设置掺气设施来降低空蚀破坏.结合新疆某水利枢纽工程实例,通过开展泄洪冲沙洞水工模型试验研究,对 1 号、2 号掺气设施挑坎高度、通气孔面积、坡比及型式进行优化设计.结果表明:体形优化后,在各种工况下,掺气设施掺气效果良好,掺气空腔完整而稳定,坎下未出现较大回水等不利流态;通气孔通气顺畅,整体水流流态平顺,无水翅溅到洞顶等不利现象;沿程余幅均满足要求;过流能力和流量系数基本与原设计一致.研究结果可为类似工程的掺气设施体形研究提供指导与技术支撑.
Abstract
Spillway structures with high water head,large flow and high flow velocity often need to set up aeration facilities to reduce cavitation damage.Based on the example of a water conservancy project in Xinjiang,the hydraulic model test of flood discharge and sand flushing tunnel was carried out to optimize the design of the bucket height,ventilation hole area,slope ratio and type of No.1 and No.2 air entraining facilities.The results show that after the shape optimization,under various working conditions,the aeration effect of the air entraining facility is good,the aeration cavity is complete and stable,and there is no unfavorable flow pattern such as large backwater under the ridge;The ventilation of the ventilation hole is smooth,the overall flow pattern is smooth,and there is no adverse phenomenon such as water wing splashing to the top of the tunnel;The residual amplitude along the way meets the requirements;The flow capacity and flow coefficient are basically consistent with the original design.The research results can provide guidance and technical support for the study of the shape of air entraining facilities in similar projects.
关键词
模型试验/无压洞/掺气设施/体形优化/流态Key words
model test/free flow tunnel/air entraining facilities/shape optimization/flow regime引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据