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Abstract:
The impact head, tip leakage vortex, and pressure pulsation during start-up can cause vibration and noise in the pump, and affect its hydraulic performance. The linear speed start-up method cannot solve the impact head and vibration problems. Therefore, in this study, a mixed-flow pump was investigated to explore the influence of different speed start-up schemes on the flow field and to optimize them. The rated speed was set to 1634 r/min, and numerical simulations of different start-up schemes were carried out using the standard k-ε model. Furthermore, the turbulent kinetic energy distribution of the inlet and outlet sections of the mixed-flow pump during different start-up schemes was provided. In addition, the normalized helicity and blade surface pressure for different start-up schemes were compared. Finally, an evaluation function was proposed to evaluate the stability of the flow field during start-up. The results showed that the evaluation function had four factors related to speed and acceleration during start-up. Factors α and γ were obtained based on the acceleration and speed at 0.2 s and 0.42 s during start-up, respectively. Factor β was affected by the time taken to reach the rated speed. Parameter δ was determined by the acceleration of the period before reaching the rated speed. Based on the evaluation function, a theoretical scientific selection of speed start-up scheme is proposed to improve the stability of the flow field in the pump during start-up. © 2023
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Source :
Ocean Engineering
ISSN: 0029-8018
Year: 2023
Volume: 277
4 . 6
JCR@2023
4 . 6 0 0
JCR@2023
ESI HC Threshold:35
JCR Journal Grade:1
CAS Journal Grade:1
Affiliated Colleges:
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