Effects of Volute Curvature on Performance of a Low Specific-Speed Centrifugal Pump at Design and Off-Design Conditions

Author:

Alemi Hamed1,Nourbakhsh Seyyed Ahmad1,Raisee Mehrdad1,Najafi Amir Farhad1

Affiliation:

1. Hydraulic Machinery Research Institute, School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran 1439955961, Iran e-mail:

Abstract

The effects of the volute geometry on the head, efficiency, and radial force of a low specific-speed centrifugal pump were investigated focusing on off-design conditions. This paper is divided into three parts. In the first part, the three-dimensional flow inside the pump with rectangular volute was simulated using three well-known turbulence models. Simulation results were compared with the available experimental data, and an acceptable agreement was obtained. In the second part, two volute design methods, namely, the constant velocity and the constant angular momentum were investigated. Obtained results showed that in general the constant velocity method gives more satisfactory performance. In the third part, three volutes with different cross section and diffuser shape were designed. In general, it was found that circular cross section volute with radial diffuser provides higher head and efficiency. Moreover, the minimum radial force occurs at higher flowrate in circular volute geometry comparing to rectangular cross section volute.

Publisher

ASME International

Subject

Mechanical Engineering

Reference15 articles.

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2. Experimental and Theoretical Study of the Flow in the Volute of a Low Specific-Speed Pump;J. Fluid Dyn. Res.,2001

3. Application of Different Turbulence Models in Unsteady Flow Simulations of Radial Diffuser Pump;Forsch. Ingenieurwes.,2010

4. Cheah, K. W., Lee, T. S., Winoto, S. H., and Zhao, Z. H., 2008, “Numerical Analysis of Impeller–Volute Tongue Interaction and Unsteady Fluid Flow in a Centrifugal Pump,” 4th International Symposium of Fluids Machinery and Fluid Engineering, Beijing, China, Nov. 24–27, pp. 24–27.

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