Design Method of Diffuser in Rotodynamic Multiphase Pump Based on Fourth-order Distribution of Velocity Moment

doi:10.3901/JME.2022.10.280

Abstract

Abstract: Rotodynamic multiphase pumps are the key equipment for exploitation of deep-sea oil and gas resources, and the geometry of diffuser is a significant factor for transporting performance. A blade design method based on segmented fourth-order distribution of velocity moment is proposed in the present work. The distribution of diffuser velocity moment is controlled by three-stage fourth-order polynomial functions, and this distribution law is determined according to parameters of control points and corresponding point. This design method is applied to a three-stage rotodynamic multiphase pump. The seven parameters of loading at hub former control point location L_1h, loading difference between hub former and latter control points ΔL_h, loading at shroud former control point location L_1s, loading difference between shroud former and latter control points ΔL_s, former control point m₁, latter control point m₂, start loading coefficient k₀ are selected, and an orthogonal optimization of 7 factors and 3 levels L₁₈(3⁷) is carried out for diffuser geometry. After design and optimization of diffuser, the pump efficiency under single-phase and multi-phase conditions are improved by 6.73% and 4.10%, respectively. The comparison between flow fields before and after optimization shows that, the range and degree of flow separation in diffuser have been suppressed.

Key words: rotodynamic multiphase pump, diffuser, fourth-order distribution of velocity moment, design method, optimization

CLC Number:

TG156

LIU Ming, TAN Lei, CAO Shuliang. Design Method of Diffuser in Rotodynamic Multiphase Pump Based on Fourth-order Distribution of Velocity Moment[J]. Journal of Mechanical Engineering, 2022, 58(10): 280-288.

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