Abstract
The possibility of increasing cooling airflow inside a hydrogenerator rotor fan is investigated. The rotor fan has a heat dissipation problem and it is suggested to investigate the increase of cooling airflow by fan redesign. The cooling airflow passes through many air ducts in the rotor and stator cores. To reduce the computational efforts, these ducts are simulated as porous media. The computational domain is discretized by hexahedral structured mesh. The rotating reference frame is used for rotating boundaries. Continuity and momentum equations are solved and the realized k–e turbulence model is applied. Results show that a big vortex is produced at the inlet of rotor fan which causes energy dissipation. Therefore, a new impeller is introduced at the rotor fan entrance to correct the inlet airflow. Results indicate that improving the rotor fan geometry can increase the cooling airflow rate by 19%.
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