基于CFD的轴流式油气混输泵动叶优化设计

为研究翼型前缘半径对轴流式油气混输泵动叶性能的影响机制，基于RNG k-ε湍流模型及SIMPLEC算法对不同翼型前缘半径的动叶模型进行数值分析，分析不同模型流场中的压力、速度、气相分布规律。数值计算结果表明:增大翼型前缘半径有助于提高动叶增压能力，同时能有效减小动叶出口附近的二次流损失，并抑制轮毂侧气体滞留和流道内的气液分离现象；当含气率(GVF)为0.2时，在设计工况（Q = 100 m3/h）下，优化后的模型M4较原模型压缩级效率提高了3.45%；在小流量工况（Q = 60 m3/h）下，优化后的模型M4较原模型压缩级效率提高了1.47%，说明将翼型前缘半径增大到最大厚度的40%时，能够有效降低能量损失，提高压缩级性能。

Optimization Design of Impeller of Multiphase Pump Based on CFD Method

In order to study the influence of the leading radius of airfoil on the impeller performance of axial multiphase pump, based on RNG k-ε turbulence model and SIMPLEC algorithm, a numerical analysis of impeller models with different leading radius of airfoil was carried out. The pressure, velocity and gas phase distribution in the flow field were analyzed. The result shows that increasing the leading radius of airfoil can improve the boosting capacity of the impeller, reduce the secondary flow loss near the outlet of the impeller and suppress the phenomenon of retention of the gas and gas-liquid separation. When gas volume fraction (GVF) is 0.2, the compression unit efficiency of optimized impeller rises by 3.45% compared to the base model under design condition (Q = 100 m3/h). When Q = 60 m3/h, the compression unit efficiency of optimized impeller rises by 1.47% compared to the base model, which indicates that when the leading radius is equal to 40% of the maximum thickness, the energy loss is reduced and the performance of compression unit is improved.