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| Unsteady hydrodynamic excitation characteristics in centrifugal pump |
| Yang Minguan1, Wang Xingning1, Gao Bo1, Zhang Ning1, Wang Jun2 |
| 1.School of Energy and Power Engineering, Jiangsu University, Zhenjiang, Jiangsu 212013, China; 2.China Zhongyuan Engineering Corp, CNNC, Shanghai 200233, China |
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Abstract The structural mesh and k-ω turbulence model were used to study the unsteady flow cha-racteristic of whole flow field in a centrifugal pump and to analyze the unsteady excitation characteristic under different working conditions.This study focused on the analysis of pressure pulsation at different locations under different working conditions and a hydrodynamic forces on the single blade, discussed the influence factor that induced the radial loading of the single blade under each revolution.It shows that, the blade passing frequency is the dominant frequency both in the pressure pulsation frequency spectrum and the impeller radial force spectrum, while the shaft frequency is the main excited frequency in the radial hydrodynamic force on a single blade.The radial force on the single blade increased with the flow, the force on single blade under low flow rate conditions is nonuniform obviously while it′s uniform close to the rated conditions or BEP.By analyzing the unsteady excitation characteristic of the single blade,the phenomenon of jet-wake at the trailing edge close to the tongue can change the blade loading significantly,the radial hydrodynamic forces is sensitive and directly related to the change of the flow structure near the volute tongue.
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Received: 26 March 2014
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