Abstract

Marine centrifugal pumps are mostly used on board ship, for transferring liquid from one point to another. Based on the combination of orthogonal testing and numerical simulation, this paper optimizes the structure of a drainage trough for a typical low-specific speed centrifugal pump, determines the priority of the various geometric factors of the drainage trough on the pump performance, and obtains the optimal impeller drainage trough scheme. The influence of drainage tank structure on the internal flow of a low-specific speed centrifugal pump is also analyzed. First, based on the experimental validation of the initial model, it is determined that the numerical simulation method used in this paper is highly accurate in predicting the performance of low-specific speed centrifugal pumps. Secondly, based on the three factors and four levels of the impeller drainage trough in the orthogonal test, the orthogonal test plan is determined and the orthogonal test results are analyzed. This work found that slit diameter and slit width have a large impact on the performance of low-specific speed centrifugal pumps, while long and short vane lap lengths have less impact. Finally, we compared the internal flow distribution between the initial model and the optimized model, and found that the slit structure could effectively reduce the pressure difference between the suction side and the pressure side of the blade. By weakening the large-scale vortex in the flow path and reducing the hydraulic losses, the drainage trough impellers obtained based on orthogonal tests can significantly improve the hydraulic efficiency of low-specific speed centrifugal pumps.

Highlights

  • The low specific speed centrifugal pump is a kind of equipment that can greatly improve the head of a medium in small flow conditions, and has irreplaceable importance in marine and other fields [1,2,3]

  • This paper will use the method of combing orthogonal tests and numerical simulations to determine the degree of influence of each geometric parameter of the drainage trough on the performance of a low-specific speed centrifugal pump, and attempts to obtain a low specific speed centrifugal pump to improve the efficiency of the impeller drainage trough indicators

  • This study set out to optimize the performance of a low-specific speed centrifugal pump based on the combination of orthogonal test and numerical simulations

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Summary

Introduction

The low specific speed centrifugal pump is a kind of equipment that can greatly improve the head of a medium in small flow conditions, and has irreplaceable importance in marine and other fields [1,2,3]. It can be found that the hydraulic design of centrifugal pumps is a complex design involving multiple parameters and multiple levels, for which the orthogonal test method is highly applicable. This paper will use the method of combing orthogonal tests and numerical simulations to determine the degree of influence of each geometric parameter of the drainage trough on the performance of a low-specific speed centrifugal pump, and attempts to obtain a low specific speed centrifugal pump to improve the efficiency of the impeller drainage trough indicators. This paper analyzes the structure of the impeller drainage trough on the impact of a low specific speed centrifugal pump flow field within the impeller. The aim is to provide a certain theoretical basis for the hydraulic performance improvement of low specific speed centrifugal pumps

Geometry and Parameters
Three-Dimensional Model
Boundary Conditions
Pump Performance Validation
Determination of Orthogonal Test Schemes
Direct Analysis of Test Results
Analysis of Extreme Variance of Test Results
Flow Field Analysis
Conclusions
Full Text
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