Unsteady Study on the Influence of the Angle of Attack of the Blade on the Stall of the Impeller of the Double-Suction Centrifugal Pump

Hao Wang, Yibin Li (), Yunshan Kong, Shengfu Zhang and Teng Niu
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Hao Wang: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Yibin Li: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Yunshan Kong: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Shengfu Zhang: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Teng Niu: School of Energy and Power Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Energies, 2022, vol. 15, issue 24, 1-21

Abstract: In order to clearly show the influence on the rotating stall of the impeller of a double-suction centrifugal pump, this paper, using the numerical simulation method of Shear Stress Transform (SST), analyzes the effects of different inlet angles of the blade on hydraulic performance, internal flow field and pressure pulsation in the impeller. The results show that the small angle of attack of the blade inlet scheme can effectively suppress the impeller rotation stall and that the design point head and efficiency are increased by 6.4% and 5.7% respectively. This paper, using turbulence intensity to determine the generation of rotating stall, proposed that the average of turbulence intensity exceeding 2% is a necessary condition for the generation of rotating stall and discovered that the standard deviation of the big angle of attack of the scheme is always greater than that of the small angle being analyzed by the impeller pressure pulsation. The basic critical frequencies of blade inlet pressure pulsation with components of a low frequency is dominated by the impeller rotating frequency F 0 and its harmonic frequencies 2F 0 , and 3F 0 , but the basic critical frequencies of blade outlet pressure pulsation is governed by Blade Passing Frequency (BPF). The research results can provide some theoretical support for stall research and hydraulic performance optimization of a double-suction pump.

Keywords: angle of attack; double-suction centrifugal pump; rotating stall; internal flow; pressure pulsation (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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