Numerical simulation of air flow distribution in large air-cooled turbo generator rotor at different rotation speed and inlet pressure

A physical model of three-dimensional half axis rotor of one 110MW air-cooled turbo-generator was created by the Gambit software. Static Cartesian coordinates mathematical model was transformed to reference rotational coordinate model to simulate. Flow field of the model was simulated numerically according Finite Volume Method by the Fluent software. The effect of rotor rotation speed and inlet pressure on the distribution of air mass flow rate of axial inlet, end duct, sub-slot and radial ducts ventilation was analyzed. Distribution of air flow rate in the rotor under experimental abnormal state is different to actual normal working state.