Design method for mixed-flow pump impeller

Abstract

The invention discloses a design method for a mixed-flow pump impeller. The method comprises the following steps that 1, the mixed-flow pump impeller is converted from a two-dimensional wooden pattern to a three-dimensional geometrical model; 2, parameterization conversion is performed on the three-dimensional geometrical model; 3, CFD numerical simulation is performed on a parameterization mixed-flow pump; 4, a CAD geometrical modeling module, a CFD numerical simulation module and numerical optimization software are integrated by designing an optimizing platform, and the impeller is optimized. The method can avoid repeated manual work, the lift and efficiency curves of the axial-flow pump obtained through the method are improved on the original basis, the lift of each operating point is increased by 5 m or above, and the efficiency is improved by about 2%; the optimized efficiency curve is lifted on the whole, the range of a high efficiency area becomes wider, the operational stability of a pump station is improved, the operating cost of the pump station is lowered, the pump device optimizing effect is quite obvious, and the method has the good market prospect.

Description

technical field [0001] The invention relates to the technical field of fluid and power engineering, in particular to a design method of a mixed-flow pump impeller. Background technique [0002] The traditional mixed-flow pump design is only designed according to a single working condition, that is, a certain set of design flow and design head value is proposed to design the whole pump according to the use occasion, but the so-called design working condition is actually just the head-flow (H-Q) performance curve At a certain point, the mixed-flow pump designed by this method can only guarantee the design performance under ideal fluid and idealized flow conditions, and cannot meet the performance under non-design conditions. In most cases, the mixed-flow pump can not be fixed. In design conditions, and most of the time of operation is in non-design conditions. The design of the mixed-flow pump should satisfy high efficiency, moderate performance curve and good cavitation char...

AI Technical Summary

Problems solved by technology

[0002] The traditional mixed-flow pump design is only designed according to a single working condition, that is, a certain set of design flow and design head value is proposed to design the whole pump according to the use occasion, but the so-called design working condition is actually just the head-flow (H-Q) performance curve At a certain point, the mixed-flow pump designed by this method can only guarantee the design performance under ideal fluid and idealized flow conditions, and cannot meet the performance under non-design conditions. In most cases, the mixed-flow pump can not be fixed. In design conditions, and most of the time of operation is in non-design conditions

The design of the mixed-flow pump should satisfy high efficiency, moderate performance curve and good cavitation characteristics. Due to factors such as the viscosity of the mixed flow pump and various flow components, adverse flow states such as vortex, backflow, stall and de-flow will occur, and these adverse flow states will gradually increase with the degree of deviation from the design working condition. Therefore, , when designing a mixed-flow pump, we should not only focus on the hydraulic performance requirements of the design working conditions, but also consider and pay attention to the hydraulic performance requirements of non-design working conditions. In addition, the traditional design method, because of its long design cycle, can no longer adapt to the current increasingly increased production needs