Abstract
AbstractThe emitted noise and vibration induced by the unsteady flow of the centrifugal pump are always focused during its running, which is also associated with the high amplitude pressure pulsations. How to reduce pressure pulsations remains a crucial problem for the researcher considering low noise design of the centrifugal pump. In the current research, a special staggered impeller is proposed to reduce intense pressure pulsations of a centrifugal pump with ns = 69 based on alleviating rotor‐stator interaction. The numerical simulation method is conducted to illustrate the influence of staggered impeller on the pump performance and pressure pulsations, and three typical flow rates (0.8ФN–1.2ФN) are simulated. Results show that the staggered impeller will lead to the pump head increasing, and at the design working condition, the increment reaches about 3% compared with the original impeller. Meanwhile, the pump efficiency is little affected by the staggered impeller, which is almost identical with the original impeller. From comparison of pressure spectra at 20 monitoring points around the impeller outlet, it is validated that the staggered impeller contributes significantly to decreasing pressure pulsations at the concerned working conditions. At the blade passing frequency, the averaged reduction of 20 points reaches 89% by using the staggered impeller at 1.0ФN. The reduction reaches to 90%, 80% at 0.8ФN, 1.2ФN, respectively. Caused by the rib within the staggered impeller, the internal flow field in the blade channel will be affected. Finally, it is concluded that the proposed staggered impeller surely has a significant effect on alleviating intense pressure pulsation of the model pump and does not obviously alter the global performance of the pump, which is very promising during the low noise pump design considering its feasibility for manufacturing.
Highlights
As the general and common machinery, pumps are used in almost all the industrial fields, and the corresponding stable operation are strictly required in special fields, for example the nuclear power plant and petrochemical industry[1,2]
To reduce rotor stator interaction, the staggered impeller is designed, and the numerical simulation method is adopted to investigate its effect on pressure pulsation and performance
Twenty monitoring points are set around the impeller exit to obtain pressure pulsation signals, which are compared with the original impeller
Summary
As the general and common machinery, pumps are used in almost all the industrial fields, and the corresponding stable operation are strictly required in special fields, for example the nuclear power plant and petrochemical industry[1,2]. Many researchers believe that the rotor-stator interaction is determined by the flow distribution at the blade trailing edge (BTE), and by controlling the flow distribution at trailing edge of the impeller, unsteady pressure pulsation energy could be decreased[16]. From such point, Gao et al analyzed the effect of BTE shape on pump performance and unsteady pressure pulsation, and results show that the BTE shape surely affects pressure pulsation energy[17,18]. Based on the published works, unsteady pressure pulsation energy within the centrifugal pump is affected by two factors, and one is the fluid distribution characteristics at the BTE and the other is the corresponding intense interacting effect with the tongue. The obtained results in the present paper will provide a direction to control pressure pulsation energy in centrifugal pump considering its strong maneuverability
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
