摘要
为探究支洞设置消力池时主、支洞交汇区域水力特性,采用RNG k-ε紊流模型结合VOF方法对某工程交汇泄洪洞水流进行了三维数值模拟。结果表明,交汇区域主洞右边墙处水深先增加后减小,左边墙处先减小后增加,下泄较长距离后横向水位趋于一致;交汇口侧下游附近最大负压随交汇角增大而增大;交汇角减小时,分离区最低水位位置向主洞下游移动,交汇区底板最大压强也随之减小,在交汇角为30°时压强值最小为1580 Pa;各交汇角度时,主、支洞水流均未出现拍顶现象,洞顶余幅满足要求。与未设置消力池时对比,发现出坎水流水体流速减小,对主洞主流的冲击减弱;将部分结果与模型试验数据进行对比,吻合良好。
For exploring the hydraulic properties of the confluence flow of spillway tunnel with stilling basin in the branch tunnel,the RNG k-εturbulent model and VOF method are applied to simulate the water flow of confluence spillway tunnel.The results show that,(a)the water depth at the right wall of the main tunnel increases at first and then decreases,the change of water depth at the left wall is opposite to the value of right one,and then the water level becomes uniform at downstream;(b)the maximum negative pressure appears at the downstream of confluence and increases with the increasing of confluence angle;(c)when the confluence angel decreases,the lowest water level of the separation zone moves to the downstream of main tunnel,the maximum pressure on the floor are of main tunnel also decreases,and the maximum pressure will lowered to 1580 Pa corresponding to 30°confluence angel;and(d)the arches of main and branch tunnels are not submerged by water flow at each confluence angel,so the remaining height of tunnel meets the requirements.The flow velocity at the bucket outflow and the impact to the main flow of main tunnel are less than the corresponding value without stilling basin,and the simulation results are in good agreement with the data obtained in experiments.
作者
邱春
文俊
QIU Chun;WEN Jun(Changzhou Vocational Institute of Mechatronic Technology,Changzhou 213164,Jiangsu,China;State Key Laboratory of Hydraulics and Mountain River Engineering,Sichuan University,Chengdu 610065,Sichuan,China;Shanghai Investigation,Design&Research Institute Co.,Ltd.,Shanghai 200335,China)
出处
《水力发电》
CAS
2021年第5期71-76,共6页
Water Power
关键词
三维数值模拟
泄洪洞
消力池
交汇角
交汇水流
3D numerical simulation
spillway tunnel
stilling basin
confluence angle
confluence flow
