放水塔消能井尺寸优化试验研究

Experimental Study on Size Optimization of Energy Dissipation Well in Outlet Tower

为保证放水塔内消能井在结构安全的情况下消能效果最好,通过模型试验研究消能井不同尺寸对底板压强、底板脉动特性及其他水力参数的影响,以放水塔的直径D0为衡量标准改变井深或井径,分别在井深H0为0.5D0、0.77D0、D0、1.5D0和井径D为D0、1.33D0、1.67D0的情况下进行研究。结果表明:随着消能井深度和直径的增大,底板时均压强逐渐减小且分布趋于均匀,脉动压强频率峰值越低,越有利于结构稳定,消能效果越好。兼顾结构安全和施工成本对消能井尺寸进行优化,其合理的尺寸为H0/D0=0.77、D/D0=1.00或H0/D0=0.50、D/D0=1.33。

In order to ensure the best energy dissipation effect of energy dissipation wells in water release tower under the condition of structural safety,the influence of different sizes of energy dissipation wells to the floor pressure,floor fluctuation characteristics and other hydraulic parameters was studied by model test.Taking the diameter D0 of the outlet tower as the measurement criterion,changing the well depth H0 or diameter D is studied under the conditions of H0=0.5×D0,H0=0.77×D0,H0=1×D0,H0=1.5×D0 and D=1×D0,D=1.33×D0,D=1.67×D0.The results show that the larger the depth and diameter of energy dissipation wells,the smaller and more uniform the timeaverage pressure on the floor,the lower the peak frequency of fluctuating pressure,the better the structural stability and energy dissipation effect.Considering structural safety and construction cost,the size of energy dissipation wells is optimized.The reasonable size of energy dissipation wells is H0/D0=0.77,D/D0=1.00 or H0/D0=0.50,D/D0=1.33.