Abstract
To investigate the unsteady flow characteristics in centrifugal pump, the flow field in a low-specific-speed centrifugal pump with complex impeller is numerically simulated under different conditions. The RNG κ-ɛ turbulence model and sliding mesh are adopted during the process of computation. The results show that the interaction between impeller and volute results in the unstable flow of the fluid, which causes the uneven distribution of pressure fluctuations around the circumference of volute. Besides the main frequency and its multiple frequency of pressure fluctuations in the centrifugal pump, the frequency caused by the long blades of complex impeller also plays a dominant role in the low-frequency areas. Furthermore, there exists biggish fluctuation phenomenon near the tongue. The composition of static pressure fluctuations frequency on the volute wall and blade outlet is similar except that the fluctuation amplitude near the volute wall reduces. In general, the different flow rates mainly have influence on the amplitude of fluctuation frequency in the pump, while have little effect on the frequency composition.
Similar content being viewed by others
References
CUI Baoling, ZHU Zuchao, LIN Yonggang, et al.: Numerical Simulation of Flow in Semi Open Centrifugal Impeller with Long-short Blade, Journal of Zhejiang University (Engineering Science), vol.41, pp.809–813, (2007). (in Chinese)
ZHANG Yuliang, LI Yi, ZHU Zuchao, et al.: Computational Analysis of Centrifugal Pump Delivering Solid- liquid Two-phase Flow during Startup Period, Chinese Journal of Mechanical Engineering, vol.27, pp.178–185, (2014).
Zhu Rongsheng, Su Baowen, Yang Ailing, et al.: Numerical Investigation of Unsteady Pressure Fluctuations in Centrifugal Pump, Transactions of the Chinese Society for Agricultural Machinery, vol.41, pp.43–47, (2010). (in Chinese)
José González, Carlos Santolaria.: Unsteady Flow Structure and Global Variables in a Centrifugal Pump, Journal of Fluids Engineering, vol.128, pp.937–946, (2006).
Jorge L. Parrondo-Gayo, Jose Gonzalez-Perez, Joaquin Fernandez-Francos: The Effect of the Operating Point on the Pressure Fluctuations at the Blade Passage Frequency in the Volute of a Centrifugal Pump, Journal of Fluids Engineering, vol.124, pp.784–790, (2002).
Hong Wang, Hiroshi Tsukamoto: Experimental and Numerical Study of Unsteady Flow in a Diffuser Pump at Off-design Conditions, Journal of Fluids Engineering, vol.125, pp.767–778, (2003).
K.W. Cheah, T. S. Lee, S. H. Winoto, et al.: Numerical Flow Simulation in a Centrifugal Pump at Design and Off-Design Conditions. International Journal of Rotating Machinery, vol.2007, (2007).
Zhifeng Yao, Fujun Wang, Lixia Qu, et al.: Experimental Investigation of Time-Frequency Characteristics of Pressure Fluctuations in a Double-Suction Centrifugal Pump, Journal of Fluids Engineering, vol.133, (2011).
Author information
Authors and Affiliations
Additional information
This work was supported by the National Natural Science Foundation of China granted No. 51276172
Rights and permissions
About this article
Cite this article
Cui, B., Chen, D., Xu, W. et al. Unsteady flow characteristic of low-specific-speed centrifugal pump under different flow-rate conditions. J. Therm. Sci. 24, 17–23 (2015). https://doi.org/10.1007/s11630-015-0750-x
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11630-015-0750-x