Study On Heat Transfer Characteristics Of Rotor Radial Ventilation Structure Of The Primary Helium Circulator Driven Motor

As the only active equipment in the primary circuit of HTGR,the safe and stable operation of helium fan driven motor is directly related to the safe and stable operation of HTGR.The accurate design of the wind path structure is an important link to ensure the safe and stable operation of the helium fan driven motor.The research on the heat transfer characteristics of the rotor radial ventilation structure in the helium environment is the premise to achieve the reasonable design of the wind path structure.It has important engineering value for the research and development of the drive motor with helium as the heat transfer medium and safe and stable operation,and has important theoretical significance for the design and analysis of the heat transfer structure with helium as the heat transfer medium of the motor.In this dissertation,the basic theories of fluid dynamics and fluid heat transfer are described in detail by referring to the relevant documents of high-temperature gas cooled reactor,helium fan,helium flow characteristics and heat transfer characteristics,and heat transfer calculation of ventilation structure in the motor,providing theoretical support for the calculation of fluid field and temperature field of the drive motor.The local ventilation structure model of the motor rotor driven by the helium fan is established.The fluid field of the local ventilation structure of the motor rotor is calculated by coupling the finite element method.The fluid distribution laws under the two motion states,different cooling media and different ventilation structures are compared and analyzed.An experimental platform is built according to the proportion of the model to verify the accuracy of the research law,and the rotor motion state The corresponding relationship between the physical properties of the cooling medium and the cooling structure and the fluid flow characteristics in the air duct provides a theoretical reference for the study of the distribution law of the convective heat transfer coefficient.The fluid structure coupling model of the local rotor of the helium fan driven motor is established,and the corresponding boundary conditions are given.The effects of the rotor motion state,the physical properties of the medium,and different ventilation and cooling structures on the heat dissipation coefficient of the inner wall surface of the radial air duct and the rotor temperature are compared and analyzed.The effects of the internal flow characteristics of the air duct on the heat dissipation coefficient changes at different positions on the inner wall surface are specifically analyzed,The rotor temperature is calculated and studied according to the distribution law of surface heat dissipation coefficient.In order to study the ventilation and cooling structure of the motor rotor in more detail and improve the heat dissipation performance of the motor,this dissertation proposes two optimization schemes and compares and analyzes the rotor temperature and cooling effect under each scheme to obtain the optimal scheme.The research results of this dissertation provide a reference for the calculation of motor rotor temperature and the optimization of motor ventilation and cooling structure,summarize the flow and heat transfer laws of the cooling medium inside the motor rotor,and provide a reference for the design and theoretical analysis of motor ventilation and cooling structure under the high-temperature and high-pressure helium environment.