Analysis and calculation of nonlinear flow field and stator temperature field in stator radial ventilating grooves for large hydro-generator in the case of insulation aging

摘要

In this paper, the coupling relation among wall temperature, surface coefficient of heat transfer and air speed in stator radial ventilating groove is used to set up the 3D stator nonlinear coupled field equations. The 3D Isoparametric Finite Element Method and Newton-Raphson Method are applied to calculate the coupled nonlinear field. Finally, in use of the Numerical Simulation Method, the influence of insulation coefficient of heat conductivity on stator temperature field is analyzed when flow field in radial ventilating groove varies in nonlinear way.