Analysis and optimization of an axial-radial hybrid ventilation generator's cooling structure

Abstract

This study focuses on investigating an axial-radial hybrid ventilation generator. The stator and rotor of the generator experience high losses. They are mitigated through simultaneous cooling air blown in from both sides of the generator. The stator is cooled radially and the rotor is designed with small tooth ventilation grooves. A three-dimensional simulation model is created using the cooling structure as a basis. The analysis covers the flow distribution characteristics and velocity variations of the generator, as well as the temperature distribution of major components. To verify the reliability of the simulation, the results are compared with experimental data. An orthogonal design experiment is utilized in conjunction with a numerical simulation method to optimize the generator's structure. The optimization objectives include the highest temperature of the stator and rotor windings, air friction loss, and pressure difference between the inlet and outlet. In comparison to the original scheme, the highest temperature of the stator windings decreases by 1.17% and the highest temperature of the rotor windings decreases by 3.16% in the optimized scheme. Additionally, the pressure difference between the inlet and outlet decreases by 5.56%. However, there is an increase of 9.82% in air friction loss in the optimized scheme. After conducting a thorough comparison, it has been determined that the optimized scheme outperforms the original scheme. The findings of this research hold significant guidance toward enhancing the cooling structure of the generator in the future.