水力发电2024，Vol.50Issue(10)：53-58,73,7.
不同阻塞比旋流阻塞泄洪洞水力特性数值模拟研究
Numerical Simulation of the Flow in the Swirling-blocking Spillway Tunnel with Different Blocking Ratios
摘要
Abstract
The blockage implied in the horizontal swirling spillway tunnel has a unique advantage in high head spillway energy dissipation,because it can increase internal pressure of the tunnel,improve cavitation conditions and obtain higher energy dissipation rate.In order to explore the influence of different blocking ratios on the hydraulic characteristics of the water flow in the tunnel,the hydraulic characteristics of the flow in the tunnel with five blocking ratios m=0.2,0.3,0.36,0.4 and 0.5 are studied in this paper by the Realizable k-ε turbulence model and VOF method,respectively.The results show that,(a)the larger the m,the smaller the cavity diameter,and the m should not exceed 0.4 because of the unstable and fluctuant cavity swirl along the tunnel when the m is more than 0.4;(b)the pressure in the cross section of the cavity swirl is approximately concentric circle with a slightly larger at the bottom,and the pressure on the wall of tunnel with a m of 0.5 is about 2/3 larger than that of 0.2,that means a significant pressurization effect,and the pressurization effect is more obvious when the m is larger than 0.3;(c)the velocity distribution of swirling flow in the cavity is three-dimensional,in which,the tangential flow velocity is approximately centrally symmetric along the radial direction,and the axial flow velocity is approximately axisymmetric;and(d)the average velocity of the tunnel with a m of 0.5 is about 1/4 smaller than that of 0.2,so the deceleration effect is also significant.The pressurization and deceleration effect of blockage is helpful to improve the cavitation conditions of the flow in the tunnel,making it suitable for the flood discharge and energy dissipation with higher water head.In summary,the blocking ratio m between 0.3 and 0.4 is more suitable.关键词
水平旋流/阻塞/阻塞比/空腔旋流/水力特性/泄洪洞Key words
horizontal swirling/blockage/blocking ratio/cavity rotary flow/hydraulic characteristics/spillway tunnel分类
建筑与水利引用本文复制引用
龙建,李奇龙,李大贵,王立杰..不同阻塞比旋流阻塞泄洪洞水力特性数值模拟研究[J].水力发电,2024,50(10):53-58,73,7.基金项目
水能资源利用关键技术湖南省重点实验室开放研究基金资助项目(PKLHD201804) （PKLHD201804）
陕西省自然科学基础研究计划一般项目(青年)(2019JQ-064) （青年）
