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为了研究无刷励磁机内部定子、转子、旋转整流盘、外罩中的流场、温度场的特点，确保设备安全稳定运行，以某新型无刷励磁机相对地面结构的1/2为物理模型，基于流体动力学原理，采用有限体积法对计算域内的三维热流场进行了数值模拟与分析。分析结果表明，整流盘与定转子之间的空气区以负压为主，整流盘区空气不能顺利流出，空气温度接近二极管许用上限。与实验测量值相比，温度与流量的计算误差均小于5.9%，结果较准确，为进一步优化该励磁机风路结构提供理论基础。“,”In order to research the thermal and fluid flow field characteristics of the air in the stator, rotor, rotating rectifier plate and housing which are the main components of the brushless exciter to ensure the safe and stable operation of the equipment, a physical model of 1/2 of a new brushless exciter structure that is relative to the ground was established, according to the computational fluid dynamics (CFD) principle, the finite volume method was adopted to simulate and analyse the three dimensional turbulent flow field and temperature field in the computational domain. The results show that the air area between the rectifier plate and the stator and rotor dominated by negative pressure, the air in the rectifier plate area cannot flow out smoothly and the temperature there is close to the diodes using limit. Compared with experimental measurements, both temperature errors and flow errors are below 5.9%. The results are accurate and can provide theoretical basis for further optimizing the air ducts structure of the exciter.