Study on vibration characteristics of evaporative cooling rotor of vertical hydro-generator
With the development of hydro-generators towards large capacity and high speed,higher requirements have been imposed on rotor cooling technology.Evaporative cooling technology is an efficient cooling method that relies on the heat absorption during the phase transition of the cooling medium.However,current evaporative cool-ing rotor schemes require a certain amount of liquid cooling medium to be stored on the rotor.In order to investigate the relationship between the liquid cooling medium on the evaporative cooling rotor and the rotor vibration character-istics,this paper preliminarily establishes a pipe-cooled evaporative cooling structure based on a prototype model of a vertical hydro-generator.The influence of evaporative cooling medium on the natural frequency of the rotor at dif-ferent liquid level heights was studied.The results show that with the increase of liquid level height,the pressure of the cooling medium on the pipe wall gradually increases,and there is no significant effect on the natural frequency of the rotor itself.The work presented in this paper provides certain guidance for subsequent optimization of the e-vaporative cooling structure of rotors,as well as further research on the coupling relationship between liquid cooling medium and rotor vibration characteristics.
hydro-generatorrotor evaporative coolingpipeline internal coolingnatural frequency
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