Impact of the Geometrical Form on the Enhancement of Heat Transfer in Grooved Rotor of Electrical Machines

Abstract

In this paper, we studied numerically using ANSYS Fluent software the heat transfer by convection in an annulo-cylindrical space of an axial air flow between a rotor rotating at constant angular velocity and a fixed stator. The aim of this work is to study the impact of the geometric shape mounted on the rotor on the improvement of heat transfer in electrical machines. For this purpose, the SST (Shear Stress Transport) model has been employed to predict the thermal effect inside the grooves. The simulated results are given in terms of streamlines, isotherms, temperature profiles and local Nusselt numbers. The results show that the trapezoidal shape «b=10mm» is interesting from a thermal point of view compared to other configurations (rectangular and trapezoidal «b=30mm» shapes).