Fluid Flow And Temperature Field Simulation Of Rotor Of Large Turbo-Generator With Air Coolant

With the turbo generator's capacity increasing, the reliability of their components depends on the heat transfer ability of the cooling system. Therefore, the knowledge of distribution of air velocity and temperature inside all the air regions in electric machine is essential. A simulation method was present, combined with a given example of that of 150MW turbo generator with air coolant. It consists of two and three dimensional numerical modelling and boundary condition of air turbulent flow and heat transfer in and between cooling duct and rotor. The model equations were solved by the Finite Volume Method according CFD principle. And simulation results were compared with a few test data. The more accurate results of asymmetry temperature distribution on periodic surface of rotor and dirtribution property of air mass flow rate along radius duct are attained. The effect of inlet velocity of fluid on temperature distribution and configuration of rotor duct etc on air mass flow rate was analyzed. The results are helpful for optimization design of rotor cooling ducts and run security of electric machine.