建立了大型汽轮发电机转子单元通风结构耦合传热的物理数学模型,进行了流场、温度场数值模拟计算.针对单、双桥两种通风结构的流动传热特性进行了分析和比较。研究表明,双桥通风结构较单桥结构增大了风沟内气流扰动,其传热性能优于单桥通风结构。在相同工况条件下,双桥通风结构转子线圈温升较单桥结构的低3.5～5.5 K。 The physical and mathematical model of coupled heat transfer in the ventilation structure of a large turbo-generator rotor unit is established and numerical simulation of flow field and temperature field is carried out. The heat transfer characteristics of two ventilation structures with single and double bridges are analyzed and compared. The research shows that the double-bridge ventilation structure increases the air-flow disturbance in the wind tunnel as compared with the single-bridge structure, and the heat transfer performance is better than the single-bridge ventilation structure. Under the same working condition, the temperature rise of the double-bridge ventilated rotor coil is 3.5 ~ 5.5 K lower than that of the single-bridge structure.