Numerical Analysis and Experimental Study of Unsteady Flow Characteristics in an Ultra-Low Specific Speed Centrifugal Pump

Yangyang Wei, Yuhui Shi, Weidong Shi () and Bo Pan
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Yangyang Wei: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
Yuhui Shi: National Research Center of Pumps, Jiangsu University, Zhenjiang 212013, China
Weidong Shi: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Bo Pan: Shandong Xinchuan Mine Electromechanical Equipment Co., Ltd., Jining 272300, China

Sustainability, 2022, vol. 14, issue 24, 1-15

Abstract: Low specific speed centrifugal pumps are widely used in urban water supply, agricultural irrigation, petrochemical and other fields due to their small flow rate and high head. Therefore, the study of unsteady flow characteristics plays a vital role in its safe and stable operation. In this paper, numerical simulation and experimental methods are used to explore the unsteady performance of the pump. The results show that the fluctuations of the external characteristic such as head, shaft power and energy loss are due to the periodic disturbance of the flow field of pump. But the transient performance of shaft power and head shows different changing trends due to different influencing factors. In this paper, the transient process of hydraulic performance is divided into three stages according to the causes and characteristics of hydraulic fluctuations. Most of the hydraulic losses occur inside the impeller, so the impeller flow field determines the level of time average hydraulic performance. Although the hydraulic loss of the spiral case is small, it is greatly affected by the rotor-stator interaction, which affects the strength of the hydraulic fluctuation. This study is of great significance to the mechanism of rotor-stator interaction and the stable operation of low specific speed centrifugal pumps.

Keywords: low specific speed; transient pulsation; hydraulic performance; rotor-stator interaction (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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