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| Simulation experiment on water pumping and vibration suppression of Francis-turbine applying honeycomb seals |
| He Lidong， Yin Dezhi， Li Chengxi， Wu Wei |
| (Diagnosis and SelfRecovery Engineering Research Center, Beijing University of Chemical Technology, Beijing 100029, China) |
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Abstract According to the structures of seal rings in Francis-turbine, the sealing model was simplified and advanced in order to reduce self-excited vibration produced by fluid in seal rings of the Francis-turbine. The experiment rig was manufactured based on the model. By measuring the rotor vibration directly, the vibration amplitude, oscillogram and frequency spectrogram between the simplified sealing model and honeycomb seals were contrasted under the conditions of various rotor eccentricity, and the vibration amplitude features of the two kinds of seals with and without imbalance mass added to the rotor were investigated. The results show that compared with the labyrinth ones, the honeycomb seal can more effectively suppress the vibration caused by rotor eccentricity and mass imbalance. The vibration behaviors are contrasted by installing water pumping device in upstream and downstream of minimal seal clearance, and the water pumping device in upstream of minimal seal clearance can significantly reduce rotor vibration.
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Received: 16 December 2009
Published: 30 May 2010
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