阻塞式复合内消能泄洪洞强剪切水气两相流的水力特性研究  

Study on Hydraulic Characteristics of Strong Shear Water-Gas Two-Phase Flow in Blocking Diffusion Section of Blocking Swirl Discharge Tunnel

作　　者：侯慧敏[1] 杨紫海 尚露露 王豫扬 HOU Hui-min;YANG Zi-hai;SH ANG Lu-lu;WANG Yu-yang(School of Energy and Power Engineering.Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学能源与动力工程学院,甘肃兰州730050

出　　处：《水电能源科学》2022年第8期127-130,152,共5页Water Resources and Power

摘　　要：为了揭示复合内消能泄洪洞空腔旋流在经过阻塞和扩散后形成的旋转扩散强剪切水气两相流的水力特性,采用Realizableκ-ε紊流模型和VOF法结合模型试验结果对强剪切水气两相流的水力特性进行研究。结果表明,强剪切水气两相流在洞内形成了一种快速贴壁面流动的水流保护层,防止空蚀空化;压强沿程先增大后减小,且随过流断面增大,最大负压由洞中心向洞底偏移;洞内流速沿程呈波动式减小,洞底与洞顶流速呈反对称变化;紊动能和耗散率沿程先增大后减小,且水气混掺越剧烈紊动能和耗散率变化越大。可见强剪切水气两相流对内消能泄洪洞起到了较好的保护和消能作用。In order to reveal the hydraulic characteristics of the strong shear water-gas two-phase flow formed by the swirling flow in the cavity of the compound internal energy dissipation spillway tunnel after blocking and diffusion,the Realizableκ-εturbulence model and VOF method were used to study the hydraulic characteristics of the strong shear water-gas two-phase flow.The results show that the strong shear water-gas two-phase flow forms a water flow protection layer with fast wall-attached flow in the tunnel,which prevents cavitation.The pressure increases first and then decreases,and the maximum negative pressure shifts from the center of the hole to the bottom of the hole as the cross section increases.The flow velocity in the tunnel decreases in a fluctuating manner along the tunnel path,and the flow velocities at the bottom and top of the tunnel show an antisymmetric change.Turbulent kinetic energy and dissipation rate increased first and then decreased along the course,and the more severe the water-air mixing,the greater the change of turbulent kinetic energy and dissipation rate.Strong shear water-gas two-phase flow has good protection and energy dissipation effect on internal energy dissipation spillway tunnel.

关 键 词：复合内消能泄洪洞 阻塞扩散段 强剪切水气两相流 水力特性 

分 类 号：TV135[水利工程—水力学及河流动力学]