泵站前池与进水池整流数值模拟

针对田山一级泵站采用闸门控制前池与进水池水位形成了闸下射流的引水特点,提出了改善前池与进水池水流流态的整流工程措施.采用雷诺时均N-S方程,结合标准k-ε湍流模型,对整流前后的前池与进水池水流流态进行了数值模拟,计算中不考虑泥沙对水流运动的影响.结果表明,采用非连续底坎、非连续挑流坎与压水板等3种整流措施相结合的方式后,前池与进水池的闸底射流长度明显变短,表面回流基本消失,断面流速分布趋于均匀,且前池与进水池底部及水泵进口附近的流速明显减小.现场试验也表明,在实施整流措施后,在两种运行工况下,泵站装置效率分别提高了1.82%和5.96%,机组振动幅度分别下降了21和52μm,且池内泥沙淤积基本消除.

Numerical simulation for fluid meliorating in both forebay and suction bay of pumping station

According to the jet feature under the sluice that formed by the water level difference in Tianshan first-stage pumping station,the efforts of fluid meliorating were put forward.The RANS equation and standard k-ε turbulence model were used to simulate the flow state,and the influence of sediment on the water flow was not taken into consideration during the simulating process.Due to the attempts of adopting discontinuous bottom sills,discontinuous trajectory sills and pressurized water board,the results show that the jet length is shorten significantly,the surface backflow disappears,the cross-section velocity distribution tends to uniform,and the velocity at the bottom of the forebay and suction bay and near the pump inlet decreases significantly.The field investigations show that the modifications adopted increase the device efficiency by 1.82% and 5.96% respectively.The vibration amplitude decreases 21 μm and 52 μm,and the sediment accumulation almost disappears in both operating conditions.