摆动水翼的摆动方式对水体推进影响分析北大核心CSCD

小河道流域水体流通性差,自净能力低,而传统泵站在超低扬程工况下存在运行效率低、振动大、噪声强等一系列问题。为解决小河道需求适宜水动力问题,本文研究摆动水翼三种摆动方式的水体推进性能,建立摆动水翼计算模型,结合Realizable k-ε湍流模型与动网格技术进行数值计算,并对水体推进效果较好的摆动方式进行实验研究。结果表明:方式三始终产生推力,方式一和方式二既产生推力,也产生阻力;涡的形成与演变是水体推进性能影响的关键因素;方式三的推进效率及泵效率均显著高于方式一和方式二;在固定频率下,方式三中流量约为490 L·s^(-1)扬程约为0.0281 m时,最大效率约为34.1%,远高于方式一、方式二的8.6%、9.4%。摆动水翼进行水体推进有着扬程低、流量大等优点,应用于小河道流域有着独特优势。

Analysis on influence of swinging modes of swing hydrofoil on water propulsion

Small river channels have poor water circulation and low self-purification capacity, while the traditional pumping station suffers from the problem of vibration, cavitation and low efficiency at ultra-low lift operating conditions. To enhance the hydrodynamic force of such rivers, we developed a swing hydrofoil and its calculation model, and studied its water propulsion performance of three swing modes. Numerical calculations were made by using the combination of the realizable k-ε turbulence model and the dynamic grid technology, and the swing mode with better water propulsion effect was tested experimentally. For this hydrofoil, results showed that Mode 3 produced only thrust, while Mode 1 and Mode 2 produced both thrust and resistance. The formation and evolution of vortices are the key factors affecting the performance in water body propulsion. Both propulsion efficiency and pump efficiency are significantly higher in Mode 3 than in those of the other two modes. At a specific frequency with a flow rate of 490 L?s-1 and a lift head of 0.0281 m, Mode 3 has its maximum efficiency of 34.1%, significantly higher than 8.6% of Mode 1 or 9.4% of Mode 2. Swing hydrofoils for water propulsion have the advantages of low lift and large flow, manifesting unique advantages in application to small river basins.