兆瓦级风力发电机在极限工况下流体场与温度场数值分析

Numerical analysis of fluid and temperature field of megawatt wind generator under extreme working condition

针对风力发电机在恶劣环境下温度升高、严重影响电机安全运行和使用寿命问题,笔者以1台在高海拔地区运行的水冷双馈风力发电机为研究对象,研究了其在极限工况下流体流动和电机传热特性。依据流体流动和电机传热特点,在基本假设条件下建立发电机求解域模型,根据风力发电机所处的特殊环境和运行状况对求解域边界进行设置。借助于CFD技术对发电机内三维流体场和温度场进行耦合求解,得出了电机内流体流动特性和温升分布规律。该规律可为使用在高海拔地区的发电机设计和安全运行提供指导建议。

Since the temperature of wind generator increases in severe the safe running and life cycle of generators, this paper studies, taking environment, which has a strong impact on a double - fed water - cooled wind generator from high - altitude region as the object, the characteristics of the fluid flow and heat transformation under extreme working condition, establishes solution domain model under the basic assumed condition, sets the boundary of solution domain according to the special environment and running state of wind generator, solves the 3D fluid and temperature field inside generator in coupling method with the help of CFD technology, by which acquires the law of fluid flow characteristic and temperature increase distribution, which provides advices for the design and safe running of wind generator for high - altitude region.