Research On Temperature Field Distribution And Influencing Factors Of Drive Motor For High Temperature Gas-cooled Reactor

The helium fan drive motor(hereinafter referred to as the drive motor)is the only active equipment in the first circuit of the fourth generation high temperature gas-cooled nuclear reactor.It is the core of the gas heat exchange system in the first circuit.The working environment of the drive motor is characterized by high temperature and high pressure,which challenges the long-term safe and stable operation of the drive motor.It is of great academic value and engineering significance to study the heat transfer law of driving motor working cavity and the related factors affecting heat transfer effect under high temperature and high pressure environment.This dissertation analyzes in detail the domestic and foreign literatures on the research of helium fan drive motors,discusses the development status of the topic at home and abroad,reviews the current research hotspots related to helium fan drive motors,and compares the commonly used analysis of flow and heat coupling.The method clarifies the research purpose and significance of this topic.The research content is mainly aimed at the heat transfer analysis of a 4500 k W three-phase two-pole large-scale vertical cage asynchronous motor used for the high-temperature gas-cooled reactor helium fan drive motor.While analyzing the two-dimensional transient electromagnetic field of the drive motor,it is estimated The formula for calculating the ventilation loss of the drive motor at different temperatures and different media is obtained,and various loss distributions as heat sources in thermal analysis are obtained.Based on the analysis and confirmation of a reasonable and efficient ventilation structure,a complex flow-heat coupling physical model of the driving motor was established,and the temperature field of thethree-dimensional physical model of the motor was numerically simulated based on the finite element method.The basic heat transfer and temperature distribution under working conditions are compared with the actual temperature measurement results of the project to verify the accuracy of the model.Based on the analysis of the temperature distribution of the drive motor under standard operating conditions,a study on the factors influencing the temperature distribution of the drive motor is proposed.Discussed the influence of different cooling media on the temperature distribution of the drive motor.According to the working requirements of the drive motor and through the discussion of the thermal properties,three different media are selected,and the temperature distribution of each part of the driving motor under different cooling media is calculated and compared.Also,the advantages and disadvantages of various media on the motor cooling effect are described.The different pressures of helium were used as the factors to affect the temperature distribution.The steady-state turbulence model of the drive motor was used to numerically calculate the heat transfer of helium in the drive motor compartment.The temperature variation trend of each part of driving motor under different pressure environment is simulated.,and analyzes the law that pressure affects the temperature distribution.In summary,in this dissertationthe,heat transfer law of the working cavity of helium-driven motor is explored,and the influencing factors of the temperature distribution of the drive motor are analyzed.It also provides reference for the design of the thermal stability of the driving motor working system in practical engineering,and ensures the stable and orderly operation of the heat exchange between the core and the steam generator in the first loop of the high temperature gas cooled reactor.