Analysis of ventilation fluid field and rotor temperature field of a generator

Aiming at the coupled problem of temperature field and ventilation system fluid field of generator,the three dimensional finite element models of ventilation system fluid field and rotor pole temperature field of a 700 kW bulb turbine generator are presented according to the hydrodynamics and heat transfer theory.By using the finite element method,the fluid field of the generator ventilation system is calculated,and the distributions of pressure and velocity of the ventilation system are obtained.Further,the coefficients of heat transfer are also obtained from the velocity distribution.Combining with the losses of different parts,the rotor temperature field distributions are analyzed.The results show that,the ventilation pressure is 464 Pa when the flux of air flow is satisfied,and the calculated pressure is coincident with the test value 483 Pa.The rotor temperature is in the range of the permissible temperature of designed insulation and has enough tolerance.