Multi-working-condition multi-target hydraulic optimization method for impeller of centrifugal pump with ultralow specific speed

Abstract

The invention discloses a multi-working-condition multi-target hydraulic optimization method for an impeller of a centrifugal pump with the ultralow specific speed. The method comprises the specific steps that the lift, the power and the efficiency of the centrifugal pump with the ultralow specific speed under various working conditions are measured; a turbulence model with the smallest error between an experiment value and worked-out values of the centrifugal pump with the ultralow specific speed under various working conditions is found out; an objective function is obtained through the combination of the maximum weighted average efficiency or the minimum weighted average power under the multiple working conditions, the minimum weighted average radial force in the impeller under the multiple working conditions and the lowest weight of the impeller, a multi-working-condition multi-target optimization model of the impeller of the centrifugal pump with the ultralow specific speed is solved on the basis of a variable complexity method-multidisciplinary feasible (VCM-MDF) optimization strategy with internal and external double-circulation structures, and an impeller overall optimal solution set is obtained; and a hydraulic model of the impeller is designed according to the impeller overall optimal solution set obtained through optimization. By means of the method, multi-working-condition multi-target hydraulic optimization can be carried out on the impeller of the centrifugal pump with the ultralow specific speed, so that the hydraulic performance of the pump is improved, and the radial force in the impeller and the weight of the impeller can also be reduced.

Description

technical field [0001] The invention belongs to the field of fluid machinery design, and particularly relates to a multi-working-condition and multi-objective hydraulic optimization method for an ultra-low specific revolution centrifugal pump impeller. Background technique [0002] Centrifugal pumps with a specific speed ≤ 30 are called ultra-low specific speed centrifugal pumps. They have the characteristics of small flow, high head, and compact structure. They have been widely used in aerospace, petrochemical and other fields. With the rapid development of aerospace, petrochemical and other industries, ultra-low specific speed centrifugal pumps are gradually developing towards high speed, high pressure and high efficiency. With the continuous expansion of the field, the application of ultra-low specific speed centrifugal pumps is becoming more and more extensive. [0003] At present, the main design methods of ultra-low specific speed centrifugal pump impeller mainly incl...

AI Technical Summary

Problems solved by technology

Use the loss extreme value method and CFD method to optimize its hydraulics, so as to find a solution with better performance, but most of the current single-objective single-working-condition hydraulic optimization is aimed at efficiency.

[0004] So far, there has been no public report on the multi-condition and multi-objective hydraulic optimization method for ultra-low specific speed centrifugal pump impellers

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