水平旋流泄洪洞原型和模型的脉动压力特性对比与分析  

Comparison and analysis to characteristics of fluctuating pressure for horizontal swirl discharge tunnel between prototype and model

作　　者：洪镝[1,2] 牛争鸣[1] 南军虎[1] 吴小丽[1] 蔡楠[1] 

机构地区：[1]西安理工大学水利水电学院,西安710048 [2]黄河上游水电开发有限责任公司,西宁810209

出　　处：《水动力学研究与进展（A辑）》2010年第6期727-736,共10页Chinese Journal of Hydrodynamics

基　　金：国家自然科学基金资助项目(50579086);高校博士学科点基金资助项目(200807000007)

摘　　要：依据公伯峡水平旋流泄洪洞原型观测和反演模型试验的成果,对这种新型水平旋流内消能泄洪洞在闸门启闭过程中的脉动压力特性进行了对比与分析。研究表明环形掺气坎上游竖井段、起旋室内及水平旋流洞内压力随时间变化趋势原型和模型的基本一致,符合重力相似准则;受缩尺效应的影响,原型和模型环形掺气坎的空腔长度不同,压力差异较大;起旋室内的压力变化可分为四个阶段;原、模型相应测点的水流的优势频率均属低频,远小于建筑物的固有频率。In this paper,the results of the inversion model test are compared with that of the prototype observation of Gongboxia horizontal swirl discharge tunnel.Based on it,the characteristics of fluctuating pressure of this new type energy dissipater in the process of the gates＇ open-and-close were analyzed.The research results show that in both the prototype and the model,the pressure change with time is approximately consistent in the shaft upper ring-form aerators,in the spiral starter and horizontal swirl tunnel,and it accords with the gravity similarity principle.At the same time,due to the model scale effect,their cavity lengths of the ring-form aerators are different and the differences of pressure are also larger.Pressure changes on the wall of the spiral starter may be classified into four steps in the process of the gates＇ open.The dominant frequencies corresponding measuring points in the prototype and the model of horizontal swirl tunnel all belong to low frequencies,are far less than the inherent frequency of the building.

关 键 词：水平旋流洞 原型观测 反演模型试验 脉动压力 缩尺效应 

分 类 号：TV651.3[水利工程—水利水电工程]