泄洪洞工作闸室及陡坡明渠段体型优化数值模拟

对九甸峡水电站右岸泄洪洞工作闸室,包括圆直段、圆变方段、方洞段、弧形闸门段、渐变段和明渠段流场进行了数值模拟。获得了水面线、压力、空化数、流速等水力要素。成功捕捉到了压力洞出口处的水翅、突扩跌坎处侧空腔和底空腔。计算结果与实测数据符合较好,根据计算结果,提出了能解决原方案负压区严重和明渠陡坡空蚀破坏问题的泄洪洞体型修改方案。

Numerical Simulation of Working Chamber of Flood Discharging Tunnel and Open Channel

The numerical simulation of Jiudianxia hydropower station right bank spillway tunnel working chamber was car-ried out .The simulated area covers the working chamber of flood discharging tunnel ,round-straight region ,round chang-ing square region ,square hole region ,tainter valve region ,transition region ,and open channel section .The obtained hydrodynamic characters include the depth of flow ,pressure distribution ,variation of cavitation ,velocity distribution and the velocity distribution along the flood discharge tunnel .Water-wing ,sudden enlargement drop-sill ,side cavity and bot-tom of the cavity have been successfully obtained .Comparison between the numerical results and model test data shows a satisfactory agreement .Based on these results ,some suggestions which can successfully solve the burden problems and the cavitation erosion have been proposed for the modification of the spillway tunnel .