多风路空冷汽轮发电机PIV流场测试实验台研发

Development of Experimental Setup of PIV Flow Field Test for Multiple Ventilation Ducts of Turbo Generator with Air Coolant

为了研究定子多风路的大型空冷汽轮发电机内部气隙中(转子外表面与定子内壁面之间)的旋转空气速度场特征,研发并试制了电机通风粒子图像测速技术(PIV)测试实验台.首先介绍了实验台的风路设计方案及部件风扇、定子和转子各部分结构及相关尺寸;设计了PIV测试实验测量方案.然后,采用ANSYS有限元程序,在符合实际的边界条件下,对通风实验台的轴与支撑环及风扇支架、转子环进行应力分布计算及分析,计算并选择合适的拖动系统电动机,得出最终的结构方案,为实验台的加工制造提供基础数据.该实验台可为大型空冷汽轮发电机旋转流场可视化研究提供平台.

In order to study the characteristics of rotating air velocity field in air-gap between the outer surface of the rotor and the stator wall of the large turbo generator with multiple ventilation ducts of stator, a Particle Image Velocimetry （PIV） experimental setup was developed and manufactured. Firstly, the design schemes of structure and related sizes of some parts （ fan, stator, and rotator） were introduced, and the scheme for PIV measurement was designed in the experimental setup. Then, the stress distribution of the shaft, support ring, fan bracket and rotor ring was calculated and analyzed by adopting ANSYS finite element programs, on the condition of actual boundary condition. Finally, the motor for dragged tained, which can provide basic data for the of the visualizing rotating flow field in large experimental setup was chosen and the final structural scheme was obprocessing and manufacturing of the test bed. The platform for research air-cooled turbo generator became available.