掺气设施后水流的挟气量规律研究  

The Rule of Air Entrainment Flow Downstream of an Aerator

作　　者：徐立洲[1] 刘昉[1] 刘卓[1] 

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《中国农村水利水电》2016年第4期162-165,169,共5页China Rural Water and Hydropower

基　　金：国家自然科学基金青年科学基金项目(51209158);国家科技支撑计划(2013BAB05B05)

摘　　要：掺气减蚀是在高速水流情况下减免泄水建筑物空蚀破坏的一项重要措施,而挟气量是衡量掺气设施效果的指标之一。在某电站泄洪洞原型观测试验的基础上,进行三维数值模拟,将原型观测与数值模型数据相结合,进而建立更加完备的试验数据体系,通过数据分析,并综合利用其他原型观测资料进行规律性探索,得出掺气设施后水流的挟气量与空腔长度、腔内负压以及来流紊动强度等因素的经验公式。For the air entrainment to alleviate cavitation is an important measure to derate cavitation from the high velocity discharge structure,the quantity of entrained air of the flow is one indicator to measure the effect of aerators.Based on the prototype observation experiment of the spillway tunnel in one hydropower station,this paper carries on the three-dimensional numerical simulation,and combines the results and the prototype observation data.As a result,one more comprehensive test data system is established.Combining the analysis of the experimental data with other prototype observation data,this paper explores the regularity of the simulation results and the prototype observation data.Making use of this regularity,this paper gets the relationship between the quantity of entrained air of the flow which is behind the aerator device and these factors which are cavity length,negative intra-articular pressure and the flow turbulence intensity and so on.

关 键 词：掺气减蚀 挟气量 原型观测 数值模拟 

分 类 号：TV131.34[水利工程—水力学及河流动力学]