Parametrization of blade leading and trailing edge positions and its influence on mixed-flow pump performance

Abstract

Based on the three-dimensional design platform, this article conducted parametrization of blade leading and trailing edge positions, and analyzed the influence of different position parameters on mixed-flow pump hydraulic performance and internal flow with model test and numerical simulation. The results showed that the hydraulic efficiency η of a mixed-flow pump increased slightly when the position parameter θ_h of the blade leading edge on the hub increased, and η increased significantly when the position parameter θ_t of the blade leading and trailing edge positions on the shroud increased. However, with θ_t increasing, the growth rate of η decreased. Numerical simulation has shown that by selecting a proper value of θ_t, the impeller energy conversion capacity can be effectively improved, and the distributions of static pressure and total energy can be more uniform in the flow passage. Meanwhile, with θ_t increasing, blade angle on the blade trailing edge decreased. Correspondingly, the absolute velocity in the outlet zone decreased, and the hydraulic loss in the outlet zone also decreased, which is beneficial to improving hydraulic efficiency of the mixed-flow pump. Within the value range of 7–9°, with different combinations of position parameter θ_t1 of the blade leading edge on the shroud and position parameter θ_t2 of the blade trailing edge on the shroud, the mixed-flow pump hydraulic efficiency η and blade wrap angle ϕ show a linear positive correlation, suggesting that an increase in ϕ could significantly improve impeller energy conversion capacity. Compared to θ_t1, θ_t2 has a more significant influence on ϕ and η. Thus, the value of θ_t2 should be carefully attended to during design process.

Keywords

Mixed-flow pump leading edge trailing edge numerical simulation model test hydraulic performance

Get full access to this article

View all access options for this article.

References

Zangeneh

. Compressible three dimensional blade design method for radial and mixed flow turbomachinery blades. Int J Numer Methods Fluids 1991; 13(5): 599–624.

Goto

Nohmi

Sakurai

. Hydrodynamic design system for pumps based on 3-D CAD, CFD, and inverse design method. ASME J Fluids Eng 2002; 124(2): 329–335.

van Esch

BPM

. Performance and radial loading of a mixed-flow pump under non-uniform suction flow. ASME J Fluids Eng 2009; 131(5): 051101–051101.

Yoon

Chung

. An optimum set of loss models for performance prediction of centrifugal compressors. Proc IMechE, Part A: J Power Energy 1997; 211(A4): 331–338.

Sarkar

. Performance study of a mixed flow impeller covering an unsteady flow field. Proc IMechE, Part A: J Power Energy 1992; 206(A2): 83–93.

Sarkar

. Performance prediction of a mixed flow impeller. Proc IMechE, Part A: J Power Energy 1992; 206(A3): 189–196.

Yoon

Chung

. Performance prediction of mixed-flow pumps. Proc IMechE Part A: J Power Energy 1998; 212(A2): 109–115.

Bing

Tan

Cao

. Prediction method of impeller performance and analysis of loss mechanism for mixed-flow pump. Sci China Tech Sci 2012; 55(7): 1988–1998.

Yoon

Park

. Hydrodynamic design and performance analysis of a centrifugal blood pump for cardiopulmonary circulation. Proc IMechE, Part A: J Power Energy 2005; 219(A7): 525–532.

10.

Yoon

Park

. Hydraulic performance analysis of an axial-flow main coolant pump for the system-integrated nuclear reactor. Proc IMechE, Part A: J Power Energy 2006; 220(A6): 635–640.

11.

Yoon

. Application of computational fluid dynamics to performance analysis of a Francis hydraulic turbine. Proc IMechE, Part A: J Power Energy 2007; 221(A4): 583–590.

12.

Yoon

. Hydrodynamically detailed performance analysis of a mixed-flow waterjet pump using computational fluid dynamics. Proc IMechE, Part C: J Mechanical Engineering Science 2008; 222(C9): 1861–1867.

13.

van Esch

BPM

Kruyt

. Hydraulic performance of a mixed-flow pump: unsteady inviscid computations and loss models. ASME J Fluids Eng 2001; 123(2): 256–264.

14.

Muggli

Holbein

Dupont

. CFD calculation of a mixed-flow pump characteristic from shutoff to maximum flow. ASME J Fluids Eng 2002; 124(3): 798–802.

15.

Kim

. Conceptual design optimization of mixed-flow pump impellers using mean streamline analysis. Proc IMechE, Part A: J Power Energy 2001; 215(A1): 133–138.

16.

Yoon

Kim

. A practical approach to the hydraulic design and performance analysis of a mixed-flow pump for marine waterjet propulsion. Proc IMechE, Part A: J Power Energy 2003; 217(A6): 659–664.

17.

Kim S, Choi YS and Lee KY. Design optimization of mixed-flow pump impellers and diffusers in a fixed meridional shape. In: Proceedings of the 10th Asian international conference on fluid machinery, University Teknologi Malaysia, Kuala Lumpur, Malaysia, 2009, pp.287−296.

18.

Bonaiuti

Zangeneh

Aartojarvi

. Parametric design of a waterjet pump by means of inverse design, CFD calculations and experimental analyses. ASME J Fluids Eng 2010; 132(3): 031104–031104.

19.

Kim

Ahn

Kim

. High-efficiency design of a mixed-flow pump. Sci China Tech Sci 2010; 53(1): 24–27.

20.

. Design parameter to improve the suction performance of mixed-flow pump impeller. Proc IMechE, Part A: J Power Energy 2010; 224(A6): 881–887.