Optimal Design Method of Axial Flow Pump Spoke Parameters Based on Response Surface Model

Abstract

The invention discloses an axial flow pump spoke parameter optimization design method based on a response surface model, comprising step 1, constructing an initial axial flow pump three-dimensional model; step 2, obtaining a test scheme; step 3, obtaining a head value based on CFD; step 4 , the spoke parameters are normalized; step 5, using the complete second-order response surface model to establish an approximate model between the input value and the output value, and calling in the Matlab environment nlinfit The function solves the coefficient; step 6, using the goodness of fit R 2 , Adjusted goodness of fit R a 2 and the coefficient of variation cv As an evaluation index, test the accuracy and reliability of the model fitting; step 7, use the genetic algorithm for optimization, and obtain the optimal parameter combination of the spokes. The invention can quickly and accurately reflect the quantitative relationship between the spokes and the external characteristics of the axial flow pump, avoid the trial calculation work based on experience in the traditional method, and improve the efficiency and accuracy of spoke parameter optimization.

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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