Steady and Unsteady Flow Characteristics inside Short Jet Self-Priming Pump

Hao Yu, Chuan Wang, Guohui Li, Hongliang Wang (), Yang Yang (), Shaohui Wu, Weidong Cao and Shanshan Li
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Hao Yu: College of Mechatronics Engineering, Hainan Vocational University of Science and Technology, Haikou 571126, China
Chuan Wang: College of Mechatronics Engineering, Hainan Vocational University of Science and Technology, Haikou 571126, China
Guohui Li: International Shipping Research Institute, GongQing Institute of Science and Technology, Jiujiang 332020, China
Hongliang Wang: College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China
Yang Yang: College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China
Shaohui Wu: College of Hydraulic Science and Engineering, Yangzhou University, Yangzhou 225009, China
Weidong Cao: High-Tech Key Laboratory of Agricultural Equipment and Intelligentization of Jiangsu Province, Jiangsu University, Zhenjiang 212013, China
Shanshan Li: State Key Laboratory of Ecohydraulics in Northwest Arid Region, Xi’an University of Technology, Xi’an 710048, China

Sustainability, 2023, vol. 15, issue 18, 1-23

Abstract: Due to their great efficiency and minimal loss, self-priming jet pumps are frequently employed in a variety of sectors for sustainable development. A short jet self-priming pump’s steady and unsteady flow characteristics are investigated numerically in this study using a standard k-ε turbulence model. The precision and dependability of the numerical calculations used in this work are demonstrated by the less than 2% difference between the pump performance data from the numerical calculation and the external characteristics test results for each flow condition. It was found that due to the perpendicularity of the nozzle axis to the impeller axis, the high-flow velocity zone in the nozzle gradually deviates to the side away from the impeller under high-flow conditions. Backflow is generated on the side close to the impeller, where eccentric vortices are created. As time progresses, the asymmetry of the low-pressure zone within the impeller becomes more pronounced under high-flow conditions, and the fluid is unable to form a stable vortex structure at a specific location. This is an important cause of impeller vibration and noise. The nonlinear vibration at the impeller inlet is less periodic, while the increase in flow rate can make the nonlinear vibration generated within the impeller more regular and stable. This reflects the fact that the fluid flow at small flow rates is more likely to be affected by the blade configuration and the shape of the flow channel, which leads to fluid instability and discontinuity. For various flow rates, the main frequency of the pressure pulsation is higher at the impeller intake (W 1 ) than it is in the impeller channel (W 2~7 ). Additionally, the pressure pulsation is more frequent before 10 times the rotational frequency, with no significant regularity. This suggests that the impeller and injector rear chamber dynamic and static interference impacts may have some bearing on the pressure pulsation. The pressure pulsation coefficients (W 2~7 ) in the impeller at different flow rates show an exponentially decreasing trend with the increase of multiples of five in the rotation frequency. The equations for the relationship between C P and 5 N F were obtained, respectively: C P-Q1 = 0.07044 × exp(−0.2372 N F ), C P-Q3 = 0.06776 × exp(−0.2564 N F ), C P-Q5 = 0.07005 × exp(−0.2884 N F ). The findings of this study contribute to understanding the flow inhomogeneities inside the pump as well as the analysis of the internal pump vibration, enhancing the jet pump’s efficiency and lifespan.

Keywords: short jet self-priming pump; unsteady; impeller; flow field; pressure pulsation (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2023
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