Prediction and Design of the External Characteristic Curve of Multistage Centrifugal Pump Based on Twin Support Vector Regression

doi:10.3901/JME.2024.14.364

Abstract

Abstract: Obtaining the external characteristic curve of a multistage centrifugal pump accurately and quickly is of great significance to the judgment of the pump performance index in the design process. The existing methods based on computational fluid dynanics(CFD) numerical simulation rely on the experience of designers, calculation time, and low accuracy of off-design points. Therefore, a prediction method of centrifugal pump external characteristic curve based on twin support vector regression(TSVR) is proposed. According to the complex characteristics of the multistage centrifugal pump flow channel, 10 structural parameters and flow are selected as the model input. The complex nonlinear relationship between structural parameters and external characteristic values is established by the TSVR method, and the external characteristic curve of the multistage centrifugal pump is predicted. Compared with the test results, the proposed method can better predict the performance indicators, and the average relative errors of head, efficiency, and axle work are 1.71%, 3.56%, and 3.36% respectively. In addition, compared with BP neural network, the root-mean-square error of TSVR for head and efficiency prediction is significantly reduced. At the same time, the prediction speed and accuracy of the TSVR model are far better than that of traditional CFD numerical calculation in the whole operating range. The comparison results show that the proposed method can improve the speed and accuracy of performance curve prediction of multistage centrifugal pumps, and can provide technical support for the fast prediction and efficient design of multistage pumps.

Key words: centrifugal pump, support vector regression, numerical simulation, multiple working conditions, performance prediction

CLC Number:

TH311

TONG Zheming, MA Xinhang. Prediction and Design of the External Characteristic Curve of Multistage Centrifugal Pump Based on Twin Support Vector Regression[J]. Journal of Mechanical Engineering, 2024, 60(14): 364-377.

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