不同出水口淹没深度的轴流泵性能及内部湍流特征

Performance and internal turbulence characteristics of axial flow pump with different outlet submerged depth

为了研究不同出水口淹没深度的轴流泵性能及内部湍流特征,以1600QZB-85轴流泵为研究对象,以CFX为平台,基于标准k-ε湍流模型,开展了0.8 n~1.2 n工况下的轴流泵出水口在不同淹没深度下的数值仿真研究。结果表明:叶轮转速一定,轴流泵的效率和扬程随着出水口淹没深度的增加呈现先增大后减小的特征;转轮区的湍动能损耗随着出水口淹没深度的增加,其湍动能损耗呈现小幅变化,呈现先减小后增大趋势,且湍动能损耗在叶轮区呈现非对称分布;在出水口淹没深度为5 m时,轴流泵内部流场最好,偏离最佳淹没深度越多,内部流场越紊乱。出水口淹没深度相同,在额定叶轮转速的工况下,轴流泵的效率最高。上述研究结果对于深入研究转轮区压力与内部湍流特征、提高轴流泵泵站运行效率等具有一定的意义。

In order to study performance and internal turbulence characteristics of axial flow pumps with different submerged depths of outlets,the 1600QZB-85 axial flow pump was taken as a research object,and CFX was used as the platform.Based on the standardκ-εturbulence model,the numerical simulation research of axial flow pump outlets under 0.8 n-1.2 n working conditions under different submerged depths was carried out.The results showed that the efficiency and head of the axial flow pump increased first and then decreased with the increase of submerged depth of outlet when the impeller speed was constant.The turbulent kinetic energy loss in the runner region presented a small change with the increase of submerged depth of outlet,which decreased first and then increased,and the turbulent kinetic energy loss presented an asymmetric distribution in the impeller region.When the submerged depth of outlet was 5 m,the internal flow field of the axial flow pump was the best,and the more the deviation from the optimal submerged depth,the more disordered the internal flow field was.The efficiency of axial flow pump was the highest under the condition of rated impeller speed with the same submerged depth of outlet.The above research results had a certain significance for the in-depth study of the pressure and internal turbulence characteristics of the runner region and the improvement of the operation efficiency of the axial flow pump station.