淮安二站枢纽导流墙对前池渗流特性影响研究OA

In order to study the optimization scheme of the shape of the diversion wall in the front pond of Huai'an Second Station Hub,hydraulic physical model tests were carried out based on the engineering design,and the changes in the flow state and hydraulic monitoring parameters of the front pond were compared under different shapes of the inlet holes of the diversion wall.Research has shown that the cross-section where the peak water level in the pool is located exhibits hysteresis variation characteristics depending on the length of the inlet hole.The larger the hole length,the higher the pool water level,but the overall amplitude of the water level decreases after the hole length is 1.2 m.In the operating conditions of low inlet flow rate of 25 m3/s and high flow rate of 100 m3/s,the flow velocity in the pool shows a"growth decrease stability"and"growth decrease"variation,respectively,and the flow velocity variation is consistent in the same flow condition.The length of the hole is negatively correlated with the flow velocity.The influence of hole edge length on time averaged pressure has stage interval characteristics,with differences in variation between 0.3-0.9m and 1.2-1.8m.However,the time averaged pressure value is positively correlated with the hole edge length,and the increase becomes more significant after the hole edge length is 1.2 m.