【摘要】 随着风力发电机单机容量的增加,发电机的通风结构和冷却方式也变得越来越复杂,对电机内通风系统计算的精度要求也越来越高。本文根据流体力学基本理论,以一台5MW双馈风力发电机为例,结合发电机通风性能以及结构特点,在基本假设的基础上,建立了1/4发电机整体域内三维流体场物理模型。通过给出相应的边界条件,采用有限体积元法对发电机内部的流体场进行了数值计算。最后对发电机内部流体场的流动特性及分布规律进行了详细分析,得出了一些有益的结论,为发电机结构优化以及更大容量风力发电机的通风设计提供了理论依据。更多还原

【Abstract】 Ventilation structure and cooling method of wind generator get complex and complex with the increasing of its capacity, while the accuracy requirements of ventilation system calculated are also increasing. The paper is based on hydromechanics theory, a 5MW large doubly-fed wind generator was take as an example, physical model that describe three dimensional fluid field of the 1/4 generator was established on the basis of basic assumptions considering ventilation characteristic and structure feature of generator. The fluid field inside generator was calculated numerically using finite volume method by giving corresponding boundary conditions. Finally, fluid flow characteristic and distribution performance of generator were analyzed in detail, and some useful conclusions were achieved, by which a theory gist for structure optimization of the generator and ventilation design of the larger capacity wind generator is provided.更多还原