Design of mixed flow pump and its numerical and parametric analysis using computational fluid dynamics

Document Type : Original Article

Authors

1 Master's degree, Malek Ashtar University of Technology, Tehran, Iran

2 Associate Professor, Malik Ashtar University of Technology, Tehran, Iran

3 Assistant Professor, Malik Ashtar University of Technology, Tehran, Iran

Abstract

Mixed-flow pumps have a wide application, high efficiency and wide range of head changes. One of the most important issues in Mixed-flow pumps is transient operation. AS for the complexity of Mixed-flow pump geometry and complexity in simulation, especially in the transient state, transient flow analysis in Mixed-flow pump has been less discussed. In this paper, a Mixed-flow pump was designed using CFturbo software and analyzed during steady state and transient process using CFX software. To ensure the correctness of the numerical results, a validation was carried out that the numerical results were in good agreement with the Experimental results. two parametric studies including the effect of changing the blade outlet angle in four different angles in the steady state and two angles in the transient state and the effect of changing the pump rotational speed on its performance were investigated. The efficiency with the increase of blade exit angle up to 26 degrees, the efficiency increased and then decreased, and by changing the blade outlet angle from 22.5 to 31 degrees, the pump head increases by about 23%. The head is proportional to the increase or decrease in speed and the efficiency decreased with the reduction of the rotational speed compared to the design point, and there was no significant change with the increase of the rotational speed compared to the design point. During the transient process, a maximum momentary pressure was observed which is about 27% higher than the design head. Pump head changes in this case are divided into three steps. In the first step, the head increases linearly, then in the second step, a momentary maximum pressure occurs, in the last step, the head curve tends to be stable.

Keywords

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History

  • Receive Date: 16 October 2023
  • Revise Date: 22 December 2023
  • Accept Date: 30 January 2024
  • Publish Date: 19 February 2024

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