Impeller robust-optimization design method of mixed-flow pump

Abstract

The invention discloses an impeller robust-optimization design method of a mixed-flow pump in impeller hydraulic-performance optimization technology. A robust-optimization problem is decomposed into arobust-sub-optimization problem and an optimal-sub-optimization problem for solving, an optimization result is enabled to be closer to robust-optimization indexes, a robust-optimization mathematical-model is established according to robustness definitions, a multiple-regression-analysis method is used to establish function relationship formulas between optimization objectives and optimization variables according to the established robust-optimization mathematical-model, a multi-objective genetic algorithm is combined to solve the function relationship formulas, and finally, a set of n parameters which can enable stability of hydraulic performance under uncertain flow work condition parameter disturbance to be optimized while the hydraulic performance of the mixed-flow pump is enabled to be optimized is obtained. Interference factors of random uncertainty fluctuation of flow work condition parameters of the mixed-flow pump in an actual running process are fully considered, and are considered in a process of establishing the function relationship formulas between the optimization variables and the optimized objectives.

Description

technical field [0001] The invention belongs to the optimization technology applied to the hydraulic performance of the impeller, in particular to the hydraulic optimization design method of the impeller of the mixed-flow pump, so as to improve the stability of the performance of the mixed-flow pump in actual operation and reduce its sensitivity to uncertain factors. Background technique [0002] Mixed-flow pumps are widely used because of their flow rate, large head variation range, wide high-efficiency zone, better improvement of the hump phenomenon in the performance curve in the environment of small flow and high head, compact structure, and easy aerodynamics. It is widely used in national economic fields such as power station cooling water circulation system, seawater desalination device, farmland irrigation, municipal water supply and drainage, etc. Secondly, the mixed flow pump is a type of pump that has the advantages of both the high head of the centrifugal pump and...

AI Technical Summary

Problems solved by technology

The environmental parameters, optimization variables and objective functions in these traditional optimization methods are all deterministic and cannot reflect the influence of objectively existing uncertain factors on the design scheme, and the performance of the optimal solution obtained by these traditional optimization design methods is often It is optimal under a certain working condition. Once the operating conditions change, the performance of the mixed flow pump will deteriorate sharply, the stability of operation will deteriorate, and even the condition of malfunction may occur.

After searching, no robust optimization design method has been found that takes into account the random uncertainty fluctuation of the flow condition parameters

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