水力发电学报2013，Vol.32Issue(3)：101-107,7.
公伯峡水平旋流泄洪洞水力特性研究
Study on hydraulic characteristics of horizontal spiral flow in the Gongboxia discharge tunnel
摘要
Abstract
The hydraulic characteristics of aerated spiral flows in the Gongboxia horizontal discharge tunnel and their scale effects were studied through theoretical analysis and comparison of a prototype experiment with laboratory tests on two models of different scales.The results are as follows.1) The tunnel discharge meets the design requirement,and the model discharges follow the Froude law of similarity.2) The flow rotation angle varies exponentially in the range from 20° to 90°.Along the tunnel,the pressure is lowered and takes a fluctuating trend,and its dominant frequency is low.3) The diameter of air cavity is in the range of 4.0 ～7.5m,and the maximum flow velocity in the range of 37.0 ～39.3m/s.Along the tunnel,circumferential components of velocity is decreasing while axial component is increasing.4) Air flow in the air vent is produced by a difference in the inlet and outlet pressures,and it becomes greater on the model of larger scale that shows greater water flow velocity in the tunnel and hence greater self-aeration capacity.Measurements of the negative pressure in the cavity and the air velocity in the air vent indicate that the pore diameter of the aeration ring is relatively small.5) This horizontal spiral flow is well aerated,and the air concentration in the vertical shaft is distributed in power law.Scale effects of flow aeration in the tunnel are significant.(6) The horizontal spiral flow tunnel has a high efficiency of energy dissipation.关键词
水力学/水平旋流/试验研究/水力特性/原型/缩尺效应Key words
hydraulics/ horizontal spiral flow / experimental study / hydraulic characteristic / prototype/ scale effect分类
建筑与水利引用本文复制引用
南军虎,牛争鸣,洪镝,朱静,吴小丽..公伯峡水平旋流泄洪洞水力特性研究[J].水力发电学报,2013,32(3):101-107,7.基金项目
国家自然科学基金资助项目(50579086) （50579086）
陕西省重点学科建设专项资金资助项目 （）
