Axial flow pump spoke parameter optimization design method based on response surface model

Abstract

The invention discloses an axial flow pump spoke parameter optimization design method based on a response surface model. The method comprises the steps: 1, constructing an initial axial flow pump three-dimensional model; 2, obtaining a test scheme; 3, obtaining a lift value based on CFD; step 4, normalizing spoke parameters; 5, establishing an approximate model between the input value and the output value by adopting a complete second-order response surface model, and solving a coefficient by calling an nlinfit function in a Matlab environment; 6, taking the goodness of fit R2, the adjusted goodness of fit Ra2 and the variable coefficient CV as judgment indexes to check the precision and credibility of model fitting; and step 7, performing optimizing by adopting a genetic algorithm to obtain an optimal parameter combination of the spokes. According to the method, the quantitative relation between the spokes and the external characteristics of the axial flow pump can be rapidly and accurately reflected, trial calculation work only depending on experience in a traditional method is avoided, and the spoke parameter optimization efficiency and precision are improved.

Description

technical field [0001] The invention relates to the field of optimal design of axial flow pumps, in particular to a method for optimal design of axial flow pump spoke parameters based on a response surface model. Background technique [0002] Axial flow pumps have the characteristics of large flow, low lift, and small water loss. In recent years, they have been widely used in low-lift pumping station projects, and have played an important role in improving the ability to resist natural disasters and promoting the development and utilization of water resources. effect. In general, the axial flow pump has high hydraulic performance near the optimal working point, but it is prone to rotating stall under the small flow condition. When the pump is running under the stall condition, the internal flow of the pump is disordered, and the efficiency drops sharply. The stable "saddle area" seriously affects the safe and stable operation of the unit. Therefore, research on how to impr...

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Problems solved by technology

The improvement effect of the spoke control technology mainly depends on the selection of the geometric parameters of the spokes. However, most of the existing studies only focus on the analysis of the improvement of the internal flow field of the axial flow pump after adding spokes, and there is a lack of systematic research on the optimal design of the spoke parameters. There are many spoke parameters, and the internal flow of the axial flow pump becomes more complicated after the addition of spokes, so it is difficult to establish a quantitative functional relationship between the spoke parameters and the external characteristics of the axial flow pump. At present, the choice of spoke parameters mostly depends on the expertise of professionals. Experience, lack of systematic theoretical basis

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