The Calculation And Analysis Of Three-dimensional Fluid Flow And Temperature Field In Air-cooled Turbogenerator Under The Ventilation Structure Improvement

The performance of generator is directly influenced by air cooled turbogenerator temperature situation, so the generator cooling condition has attracted alot of attention and the researcher’s focuses on the study of generator ventilationstructure. The generator internal air distribution are directly affected by differentventilation structure, and then the cooling condition produced very big effect. Inresponse to this condition, the following research content is done in this article.The air cooled turbo generator is taken as an example in this paper,changing the shape of stator ventilation channel, fixing a wind deflector on thestator teeth adjacent to the ventilation ducts, and changing the angle of the winddeflector, A comprehensive computational of fluid distribution and effect oftemperature on generator stator under the condition of fluid from different anglesinto the ventilation channel. In addition, stator ventilation structure is furtherchanged, and six hollow pipes are fixed in the stator windings. Then let air flowsthrough the pipes to cool the stator winding. Through the establishment of statoraxial three-dimensional model, stator internal fluid distribution is analyzed withfinite element calculation method. At the same time the temperature condition invarious parts of the generator stator are got, as well as the air cooling has doneinfluence on stator winding temperature. Finally, The basis of the above study，some research of the generator are done under steady-state negative sequencecondition: According to the principle of fluid dynamics,3D fluid and thetemperature coupling model of the rotor a circle and axis includes a ventilationgroove are established. The rotor temperature and the air flow characteristics in the trench radial distribution are calculated and analyzed under negativesequence, and the results with normal circumstance are compared. Also thegenerator of the biggest steady-state negative sequence ability is checked. Theresults of rotor temperature and the operation test data are compared, and thereliability of this method are verified.In this paper, the finite element method is used to calculate， the calculatedvalues and experimental values are compared. And the error can meet theengineering requirements, so the correctness of this method are verified. And themethods can be used on other types of turbo generator analysis.