摘要
随着风力发电机容量增加,电磁负荷不断增加,发电机温升计算以及冷却介质流动分析的重要性不容忽视。针对发电机内部温升分布不均、流体流动复杂的问题,以计算流体力学(CFD)和传热学为理论基础,根据2.5 MW永磁风力发电机通风系统结构和传热特点,建立全域三维流动及传热耦合的物理模型和数学模型,结合工程实际给出基本假设和边界条件,采用有限体积法(FVM)对流体场及温度场进行求解,得出发电机内部冷却介质流动性能、传热特性、表面散热系数以及发电机各部件的温升分布情况,并将耦合场计算结果与实测结果进行比较分析。结果表明,数值研究与实验数据相吻合,为永磁风力发电机综合物理场的准确计算以及通风结构的优化提供了理论依据。
With the increase of wind generator capacity and electromagnetic load,temperature rise calculation and fluid flow analysis become important.Aiming at nonuniform temperature rise distribution and complex fluid flow inside generator,on the basis of computational fluid dynamics（CFD） and heat transfer theory,the mathematical and physical model of 3D fluid flow and heat transfer coupled was established according to structure characteristic of 2.5 MW permanent-magnet wind generator.Fluid-flow and thermal field was calculated coupled using finite volume method by giving fundamental assumptions and corresponding boundary conditions.From the research,the performance of fluid flow,characteristic of heat transfer,surface coefficient of heat transfer,and temperature rise distribution of generator were obtained,and the calculation result was compared with test value.The results show that numerical investigation was agree measured results,by which a theory gist for accurate calculation of synthetic physical fields and structure optimization for the larger capacity permanent-magnet wind generator is provided.
出处
《电机与控制学报》
EI
CSCD
北大核心
2012年第8期74-80,共7页
Electric Machines and Control
基金
黑龙江省博士后基金(Lbh-z10232)
关键词
永磁风力发电机
流体流动
传热特性
耦合
有限体积法
表面散热系数
permanent-magnet wind generator； fluid flow； heat transfer characteristic； coupling； finite volume method； surface coefficient of heat transfer
