Analysis of Unsteady Pressure Fluctuation in a Semi-Open Cutting Pump

Weidong Cao, Jiayu Mao and Wei Li
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Weidong Cao: Research Institute of Fluid Engineering Technology, Jiangsu University, Zhenjiang 212013, China
Jiayu Mao: Research Institute of Fluid Engineering Technology, Jiangsu University, Zhenjiang 212013, China
Wei Li: China National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China

Energies, 2020, vol. 13, issue 14, 1-15

Abstract: In order to understand the pressure fluctuation characteristics of a semi-open cutting pump, the three-dimensional unsteady flow fields were calculated. External and internal flow characteristics of four schemes with different relative angles between the rotary cutter and the impeller were studied. The pressure fluctuations in the lower plate, the upper plate, the clearance between the rotary cutter and the fixed cutter, the first section in volute and nearby parts of the tongue were all analyzed, which are all the places that pressure distributions are greatly affected by the static and dynamic interaction, and at the same time, the force on the impeller was also analyzed. The results show that the fluctuations at different positions change periodically; the main frequency is blade frequency. The amplitude of pressure fluctuation decreases from near the rotating part to far away, from near the tongue to far from the tongue. Due to the influence of both impeller and rotary cutter, the pressure fluctuation on the lower plate is the largest. The pressure fluctuation is affected by flow rate, the larger the flow rate, the greater the pressure fluctuation. The radial and axial forces of the impeller change periodically with time, and the number of wave peaks and wave valleys is the same as the number of blades.

Keywords: cutting pump; unsteady pressure; rotary cutter; radial force; axial 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: 2020
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