为更好地指导电机设计，以一台3 MW空-空冷双馈风力发电机为研究对象，基于流体力学及数值传热学理论，结合空-空冷却器和发电机模型，搭建了三维流动与传热耦合求解的物理模型和数学模型。依据基本假设和边界条件，采用Fluent软件对电机在额定工况下的稳态三维流场和温度场进行数值求解。通过电阻法和埋置检温计(ETD)法测得电机在额定工况下绕组的平均温升和最高温升。通过对比数值结果和试验数据发现误差在5 K之内，验证了数值方法的正确性。最后，对电机流场和温度场分布进行数值模拟，对电机18档通风道内流量进行数值计算，为新产品电机设计和优化提供支撑。

In order to better guide the wind generator design, a 3 MW air-air cooled doubly-fed wind generator is taken as an example for the research of flow and heat transfer characteristics. Based on the theory of hydromechanics and numerical heat transfer, the 3D fluid flow and heat transfer coupled physical and mathematical models are established according to the model of air-air cooler and wind generator. Fluent software is used to numerically simulate the steady 3D flow and temperature fields of the wind generator under rated working conditions with given fundamental assumptions and boundary conditions, and the experimental data of winding temperature rise are obtained by adopting resistance and embedded temperature detector (ETD) methods under the same working conditions. It is found that the error is within 5 K between the numerical simulation results and experimental data, indicating that the numerical method is credible. Finally, the distributions of the wind generator flow and temperature fields are analyzed, and the flow rate of the 18-vent motor is calculated in detail. This method provides a theoretical support for the simulation and optimization of new wind generators.