大坡降旋流复合内消能泄洪洞水力特性研究  

Study on Hydraulic Characteristics of Large Gradient In-energy Dissipation Tunnel Combined the Spiral Flow Barrage with Diffusion

作　　者：曹双利[1] 郭开开[1] 牛争鸣[1] 

机构地区：[1]西安理工大学水力学研究所,陕西西安710048

出　　处：《水力发电》2013年第4期29-33,共5页Water Power

基　　金：高校博士学科点基金(200807000007);国家自然科学基金-雅砻联合基金(50579086)

摘　　要：旋流复合式内消能泄洪洞利用在旋流洞末端设置旋流阻塞与旋流扩散段,连接旋流洞和原导流洞,达到旋流洞内增压、减速、防空蚀,旋流洞段与旋流扩散段分段消能,提高作用水头和增大消能率的目的。采用Realizablek-ε紊流模型,结合模型试验对大坡降旋流复合内消能泄洪洞的水力特性进行了对比研究。结果表明,Realizable k-ε紊流模型和VOF法可以较好地模拟大坡降旋流复合内消能泄洪洞的各种水力特性,数值模拟与试验观测的流态和其他水力特性基本一致,且数值模拟还得到压强沿径向的分布规律、轴向流速和切向流速沿程与沿径向的分布规律及紊动能和耗散率沿程与沿径向的分布规律,弥补了模型试验无法对以上水力特性进行直接量测的不足。Setting spiral flow barrage and swirling diffusion segment at the end of swirling flow tunnel to connect the swirling flow tunnel and the original diversion tunnel, in-energy dissipation tunnel combined the spiral flow barrage with diffusion can achieve the purposes of pressurization, deceleration and cavitation prevention in swirling flow tunnel, and segmented energy dissipation in swirling section and swirling diffusion segment to improve water head acting and increase energy dissipation rate. By using Realizable κ-ε turbulence model and combining with model experiment results, the hydraulic characteristics of swirling flow tunnel is analyzed. The results show that the Realizable κ-ε turbulence model and the VOF method can be used to simulate the hydraulic characteristics of large gradient in-energy dissipation tunnel combined the spiral flow barrage with diffusion, and the flow regime and other hydraulic characteristics obtained by nmnerical simulation are consistent with model experiment results basically. The distribution of pressure along radial direction, and the distributions of axial velocity, tangential velocity, eddy kinetic energy and dissipation rate along flowing way and radial direction are also obtained by numerical simulation, which can not be directly measured in model experiment.

关 键 词：大坡降 旋流复合内消能泄洪洞 水力特性 模型试验 数值模拟 

分 类 号：TV651.3[水利工程—水利水电工程] TV653