Rotordynamic forces generated by discharge-to-suction leakage flows in centrifugal pumps |
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Authors: | LIU Quan-zhong WANG Hong-jie and LIU Zhan-sheng |
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Affiliation: | School of Energy and Power Engineering,Harbin Institute of Technology,Harbin 150001,China |
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Abstract: | In order to investigate the flow-induced vibration in the shroud passage of centrifugal pump and pre-dict rotordynamic forces of centrifugal pump rotor system,an analysis of rotordynamic forces arising from shrou-ded centnlugal pump is presented.CFD techniques were utilized to analyze the full three-dimensional viscous,primary/secondary flow field in a centrifugal pump impeller to determine rotordynamic forces. Multiple quasi-steady solutions of an eccentric three-dimensional model at different whirl frequency ratios yielded the rotordy-namic forces. The skew-symmetric stiffness,damping,and mass matrices were obtained by second-order least-squares analysis.Simulation of the coupled primary/secondary flow field was conducted,and the complex flow characteristcs.in the flow field of a shroud passage were achieved including the mean velocity and pressure,as well as the eddy in a large scale of flow field due to viscosity.The rotordynamic force coefficients were calculat-ed,and the results were in good agreement with those of experiment except for the direct inertial coefficient without the consideration of whirling forces from the impeller primary flow passage. |
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Keywords: | centrifugal pump shroud passages whirl rotordynamic force numerical calculation |
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