Fluid Field And Temperature Field Analysis And Calculation Of A 300MW Large Turbo Generator

As the key part of the power system,the large turbine generator is closely related to the stability of the power system,power quality and power demand.For improving turbine generator unit capacity while maintaining the output power stability,the electromagnetic load must be improved,the all generator ventilation and temperature distribution should be learned in order to ensure the reliable operation of large turbine generator.It is very important to accurately calculate the distribution of the rotating rotor duct flow field,rotor temperature distribution and stator fluid and temperature distribution,and all research results can provide the useful reference for the further design of the large turbo-generators.In this paper,the 3D fluid field and temperature field distribution of the rotor and stator for a 300MW hydrogen-water-cooled turbo-generator are investigated,the main work is as follows:Firstly,the rotor ventilation model of 300MW large turbine generator is built by using UG software.Based on the principle of fluid mechanics,the bilateral ventilation fluid field distribution,single-sided ventilation fluid field distribution and the radial duct fluid distribution at different rotation speeds are investigated by using Fluent software,the hydrogen and air pressure on the ventilation duct is studied and compared,and the results demonstrate the advantage of bilateral ventilation.Secondly,the rotor 3D temperature field model is built by using UG software and the initial inlet hydrogen velocity is calculated according to the calculation results of rotor ventilation flow field.The rotor winding heat energy is loaded into Fluent as body heat source,according to the heat transfer theory and large turbine generator cooling technology knowledge,the rotor temperature field distribution is investigated by using Fluent software.From the perspective of radial angle,the slot temperature that is closed to the rotor big tooth is minimum and the slot temperature that is far from rotor big tooth is maximum.From the perspective of axial angle,the rotor temperature showed a trend of first increasing and then decreasing in the middle of rotor.After that,the effect of rotor surface loss on the rotor temperature variation is analyzed.Finally,the stator 3D temperature field model is built by using UG software.The stator core heat source can be obtained by using Ansoft Maxwell,the stator winding heat source and core heat source are loaded into Fluent software to the coupling calculation of stator fluid field and temperature field.Then the fluid field and temperature field distribution of large turbo generator are obtained,the results demonstrate the advantage of hydrogen-water-cooled system.The effect of stator water pipe blockage on stator winding and main insulation is also investigated,it is found that two low bar water pipe blockages have a great influence on the low winding and low insulation temperature.