Energy Performance and Radial Force of a Mixed-Flow Pump with Symmetrical and Unsymmetrical Tip Clearances

Yue Hao, Lei Tan, Yabin Liu, Yun Xu, Jinsong Zhang and Baoshan Zhu
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Yue Hao: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Lei Tan: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Yabin Liu: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Yun Xu: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Jinsong Zhang: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China
Baoshan Zhu: State Key Laboratory of Hydroscience and Engineering, Tsinghua University, Beijing 100084, China

Energies, 2017, vol. 10, issue 1, 1-13

Abstract: The energy performance and radial force of a mixed flow pump with symmetrical and unsymmetrical tip clearance are investigated in this paper. As the tip clearance increases, the pump head and efficiency both decrease. The center of the radial force on the principal axis is located at the coordinate origin when the tip clearance is symmetrical, and moves to the third quadrant when the tip clearance is unsymmetrical. Analysis results show that the total radial force on the principal axis is closely related to the fluctuation of mass flow rate in each single flow channel. Unsteady simulations show that the dominant frequencies of radial force on the hub and blade correspond to the blade number, vane number, or double blade number because of the rotor stator interaction. The radial force on the blade pressure side decreases with the tip clearance increase because of leakage flow. The unsymmetrical tip clearances in an impeller induce uneven leakage flow rate and then result in unsymmetrical work ability of each blade and flow pattern in each channel. Thus, the energy performance decreases and the total radial force increases for a mixed flow pump with unsymmetrical tip clearance.

Keywords: mixed-flow pump; symmetrical and unsymmetrical; tip clearance; radial force (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: 2017
References: View complete reference list from CitEc
Citations: View citations in EconPapers (21)

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