环境气压对掺气设施空腔长度的影响分析  

Analysis of Ambient Air Pressure Effect on Cavity Length of Aeration Facility

作　　者：庞博慧 张陆陈[2] 迟福东 PANG Bo-hui;ZHANG Lu-chen;CHI Fu-dong(Huaneng Lancang River Hydropower Inc.,Kunming 650214,China;State Key Laboratory of Hydrology Water Resources and Hydraulic Engineering,Nanjing Hydraulic Research Institute,Nanjing 210029,China)

机构地区：[1]华能澜沧江水电股份有限公司,云南昆明650214 [2]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,江苏南京210029

出　　处：《水电能源科学》2020年第7期114-116,121,共4页Water Resources and Power

基　　金：中国华能集团总部支持项目(HNKJ17-H21);云南省马洪琪院士2016年自由探索项目(2016HA012);华能集团公司众创项目。

摘　　要：低气压环境下泄水建筑物空化空蚀风险增大,环境气压对掺气减蚀效果的影响程度是高海拔地区高坝水力设计时需重点关注的问题。采用CFD数值仿真方法,建立跌坎和挑坎两种不同体型的掺气设施模型,分析不同环境气压下的掺气设施的空腔长度,研究环境气压对高速水流掺气效果的影响。结果表明,环境气压越低,高速水流掺气空腔长度越小,掺气效果越弱,高海拔地区高速水流防蚀设计应合理考虑环境气压的影响程度。Discharging structures have a high risk of cavitation in low air pressure environment.The impact of ambient air pressure on the aeration cavitation reduction is a scientific concern in high-dam hydrodynamic design in high altitude areas.The CFD numerical simulation method is employed to establish different aeration facility models for step-down floor and flip bucket,respectively.The cavity length of aeration facilities are analyzed under different ambient air pressures,and the impact of ambient air pressure on aeration of high-speed water flow is studied.It shows that lower ambient air pressure results in shorter cavity length of high-speed water flow and weaker aeration effect.The ambient air pressure effect should be reasonably considered in the cavitation prevention design for high-speed water flow in high altitude areas.

关 键 词：高速水流 掺气设施 环境气压 空腔长度 

分 类 号：TV135[水利工程—水力学及河流动力学]