Investigation on characteristics of pressure fluctuation in a centrifugal pump with clearance flow
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DOI 10.1007/s12206-020-0818-8
Journal of Mechanical Science and Technology 34 (9) 2020 Original Article DOI 10.1007/s12206-020-0818-8 Keywords: · Centrifugal pump · Clearance flow · Frequency spectra · Numerical calculation · Pressure fluctuation
Investigation on characteristics of pressure fluctuation in a centrifugal pump with clearance flow Lulu Zheng1, Xiaoping Chen2, Wei Zhang2, Zuchao Zhu2, Jinglei Qu1, Mengmeng Wang1, Xiaojie Ma1 and Xueli Cheng1 1
Correspondence to: Xiaoping Chen [email protected]
Citation: Zheng, L., Chen, X., Zhang, W., Zhu, Z., Qu, J., Wang, M., Ma, X., Cheng, X. (2020). Investigation on characteristics of pressure fluctuation in a centrifugal pump with clearance flow. Journal of Mechanical Science and Technology 34 (9) (2020) 3657~3666. http://doi.org/10.1007/s12206-020-0818-8
Received February 26th, 2020 Revised
May 3rd, 2020
Accepted June 24th, 2020
Faculty of Mechanical Engineering, Henan Institute of Technology, Xinxiang, Henan 453003, China, National-Provincial Joint Engineering Laboratory for Fluid Transmission System Technology, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
2
Abstract
Clearance flow has great impact on pressure fluctuation of centrifugal pumps. Numerical calculations are performed to study the pressure fluctuation characteristics of centrifugal pump with wear ring clearance, especially in the regions of interaction between main flow and clearance flow (IMC) and clearance. The accuracy of numerical calculations is illustrated by comparing the experiments of performance and pressure fluctuation. Results show that, in clearance region the pressure fluctuation is still governed by blade passing frequency (fBPF). Its amplitude of dominate frequency of pressure fluctuation becomes larger as the probe approaches the impeller exit. In IMC region, the pressure fluctuation at impeller outlet is dominated by fBPF. However, the dominate frequency at the entrance of impeller is less than fBPF. In addition, as the flow rate increased, the amplitude of dominate frequency of pressure fluctuation increases at impeller entrance, whereas an inverse trend is observed at wear ring clearance region.
† Recommended by Editor Yang Na
1. Introduction
© The Korean Society of Mechanical Engineers and Springer-Verlag GmbH Germany, part of Springer Nature 2020
Strong pressure fluctuation has important influence on the stability and safety of centrifugal pump operation, which is widely used as key equipment in aerospace, hydraulic engineering, petrochemical and coal chemical industries [1-7]. Unsteady pressure fluctuation, which is closely associated with the main flow and clearance flow, directly affects the pump comprehensive performance. A large number of research work has been done on pressure fluctuation of the centrifugal pumps, which is mainly focusing on the main flow [8-22]. Spence and Amaral-Teixeira [8] analyzed the pressure geometric parameters on the pressure fluctuation of a pump, by extracting the date from 15 monitoring points. Intense pressure
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