Abstract
In order to reveal the regularity of unsteady flow of centrifugal pump under different cavitation stages, a visual closed test-bed is built to collect signals such as the distribution of cavitation bubbles at the impeller inlet and external characteristics, etc. in the process of cavitation of centrifugal pumps. Combined with the shape and distribution of bubbles captured by high-speed photography, the cavitation stage of the centrifugal pump is divided. In addition, the variation of vorticity distribution, pressure pulsation and radial force of centrifugal pump under different cavitation stages are studied using the standard k-ε turbulence model and the Kunz cavitation model. Main contributions are as follows: The cavitation bubbles can absorb the energy of vortex core to a certain extent and increase the volume of vortex core. Cavitation bubbles can also block the flow-path and induce the distortion of the internal flow field, resulting in unstable pressure waves that cause a significant increase in pressure pulsation rate. Besides, with the development of cavitation, the radial force on the impeller tends to remain invariable first and then decrease, and trajectory of the radial force changes from closed to open.
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Li Y.Q., Yuan S.W., Lai H.X., Numerical study of unsteady flows with cavitation in a high-speed micro centrifugal pump. Journal of Thermal Science, 2017, 26(01): 18–24.
Zhang N., Yang M.G., Gao B., Li Z., Vibration characteristics induced by cavitation in a centrifugal pump with slope volute. Shock and Vibration. 2015, 2015: 1–10.
Huang B., Wu Q., Wang G.Y., Research status and progress of unstable cavitating flow. Journal of Irrigation and Drainage Machinery Engineering, 2018, 36(01): 1–14. (in Chinese).
Lei T., Shan Z.B., Liang C.S., et al, Numerical simulation of unsteady cavitation flow in a centrifugal pump at off-design conditions. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2014, 228(11): 1994–2006.
Li X.J., Jiang Z.W., Zhu Z.C., et al, Entropy generation analysis for the cavitating head-drop characteristic of a centrifugal pump. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2018: 095440621775345.
Dong L., Zhao Y.Q., Dai C., Wang Y., Research on cavitation acoustic characteristics of centrifugal pump based on fluid-acoustic field coupling method. Advances in Mechanical Engineering, 2018, 10(5): 1–13.
Li Q.F., Liu C., Wang Y.K., Cavitation characteristics of pump-turbine under partial load. Journal of Drainage and Irrigation Machinery Engineering, 2017, 35(08): 680–684. (in Chinese).
Kang J.Y., Zhu R.S., et al, The influence of impeller geometric parameters on fracture cavitation performance in centrifugal pumps. Journal of Drainage and Irrigation Machinery Engineering, 2018, 36(02): 111–117. (in Chinese).
Tan L., Zhu B.S., Wang Y.C., et al, Numerical study on characteristics of unsteady flow in a centrifugal pump volute at partial load condition. Engineering Computations, 2015, 32(6): 1549–1566.
Athavale M.M., Li H.Y., Yu J., et al, Application of the full cavitation model to pumps and inducers. International Journal of Rotating Machinery, 2014, 8(1): 45–56.
Li X.J., Yu B.X., Ji Y.C., Lu J.X., Yuan S.Q., et al, Statistical characteristics of suction pressure signals for a centrifugal pump under cavitating conditions. Journal of Thermal Science, 2017(26): 47–53.
Belahadji B., Franc P., Michel M., Cavitation in the rotational structures of a turbulent wake. Journal of Fluid Mechanics. 1995, 287: 383–403.
Friedrichs J., Kosyna G., Rotating cavitation in a centrifugal pump impeller of low specific speed. Journal of Fluids Engineering, 2002, 124(2): 356–362.
Li J., Liu L.J., Li G.J., et al, Numerical study on the effect of cavitation number on the hydraulic performance of centrifugal pumps. Journal of Engineering Thermophysics, 2010, V31(5): 773–776. (in Chinese).
He M., Wang C.C., Li X.Q., Study on impeller force characteristics of cavitation flow field in centrifugal pump. General Machinery, 2017(08): 79–83. (in Chinese).
Pouffary B., Fortes-Patella R., Roboud J., et al, Numerical simulation of 3D cavitating flows: analysis of cavitation head drop in turbomachinery. ASME Journal of Fluids Engineering, 2008, 130, p.061301.
Li C.Y., Ceccio S.L., Interaction of single travelling bubbles with the boundary layer and attached cavitation. Journal of Fluid Mechanics. 1996, 322: 329–353.
Arakeri V.H., Acosta A.J., Viscous effects in the inception of cavitation on axisymmetric bodies. Journal of Fluids Engineering, 1973, 95(4): 519–527.
Belahadji B., Franc P., Michel M., Cavitation in the rotational structures of a turbulent wake. Journal of Fluid Mechanics. 1995, 287: 383–403.
Gopalan S., Katz J., Flow structure and modeling issues in the closure region of attached cavitation. Physics of Fluids, 2000, 12(4): 3414–3431.
Meng L., He M., Zhou L., et al., Influence of impeller-tongue interaction on the unsteady cavitation behavior in a centrifugal pump. Engineering Computations, 2016, 33(1): 171–183.
Li X., Gao P., Zhu Z., et al, Effect of the blade loading distribution on hydrodynamic performance of a centrifugal pump with cylindrical blades. Journal of Mechanical Science & Technology, 2018, 32(3): 1161–1170.
Huang R.F., Luo X.W., Ji B., et al., Multi-objective optimization of a mixed-flow pump impeller using modified NSGA-II algorithm. Science China Technological Sciences, 2015, 58(12): 2122–2130.
Yao Z.F., Wang F.J., Xiao R.F., et al., Experimental investigation of pressure instabilities affected by cavitation for a double-suction centrifugal pump. IOP Conference Series: Earth and Environmental Science, 2012, 15(6): 062040.
Dong L., Zhao Y.Q., Liu H.L., Dai C., Vladimirovich Gradov D, Wang Y., The effect of front streamline wrapping angle variation in a super-low specific speed centrifugal pump. Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science, 2018: 095440621877260.
Hunt J.C.R., Wray A.A., Moin P., Eddies, stream, and convergence zones in turbulent flows. Studying Turbulence Using Numerical Simulation Databases. Studying Turbulence Using Numerical Simulation Databases, 2, 1988.
Acknowledgement
This work was supported by the National Key Research and Development Program of China (2017YFC0804107), National Natural Science Foundation of China (No. 51879122, 51779106, 51509111), the association innovation fund of production, learning, and research (BY2016072-01), Zhenjiang key research and development plan (GY2017001, GY2018025), the Open Research Subject of Key Laboratory of Fluid and Power Machinery, Ministry of Education, Xihua University (szjj2015-017, szjj2017-094, szjj2016-068), Sichuan Provincial Key Lab of Process Equipment and Control (GK201614, GK201816), the Advanced Talent Foundation of Jiangsu University (15JDG052) and a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), Jiangsu top six talent summit project (GDZB-017).
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Dong, L., Shang, H., Zhao, Y. et al. Study on Unstable Characteristics of Centrifugal Pump under Different Cavitation Stages. J. Therm. Sci. 28, 608–620 (2019). https://doi.org/10.1007/s11630-019-1136-2
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DOI: https://doi.org/10.1007/s11630-019-1136-2