Inverse Design and Optimization of Low Specific Speed Centrifugal Pump Blade Based on Adaptive POD Hybrid Model

Document Type : Regular Article

Authors

1 School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou, Gansu, 730050, China

2 Key Laboratory of Fluid machinery and Systems, Lanzhou University of Technology, Lanzhou, Gansu, 730050, China

10.47176/jafm.15.02.33031

Abstract

To improve the prediction accuracy of the surrogate model and reduce the calculation cost for hydraulic optimization design of centrifugal pump impeller, an inverse design and optimization method based on adaptive proper orthogonal decomposition (APOD) hybrid model was proposed. Initial samples were designed by perturbing blade control parameters of the original model. The samples were classified using the K-means clustering algorithm, and the adaptive samples were selected according to the category of the objective sample. The snapshot set is composed of blade shape parameters and the CFD flow field data in impeller, which is decomposed into a linear combination of orthogonal bases by the proper orthogonal decomposition (POD) method to predict the objective parameters. According to the objective load distribution, the low specific speed centrifugal pump was inversely designed by using the APOD model, and its initial blade was obtained. And then, the flow field corresponding to disturbed blade shape was predicted using the APOD method, so as to evaluate the gradient of the objective function to design variables. Finally, the initial blade was optimized by the gradient descent method. The results show that the APOD hybrid model method can be employed to accomplish the blade inverse design and the flow field prediction in the optimization design of centrifugal impeller, which significantly reduces the numerical calculation cost and improves the accuracy of the flow field prediction.

Keywords


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Volume 15, Issue 2 - Serial Number 63
March and April 2022
Pages 453-464
  • Received: 21 May 2021
  • Revised: 18 September 2021
  • Accepted: 11 October 2021
  • First Publish Date: 31 January 2022