Numerical Calculation of Fluid Heat Transfer in Rotor of Large Air-cooled Generator Based on Global Ventilation Network Model

Large-scale air-cooled generators are the most widely used generators. The internal air flow state and heat transfer characteristics of the rotor are difficult to accurately characterize under the high pressure of wafter and the rotating centrifugal pressure. This paper presents a new calculation method for the coupling of totally enclosed circulation global ventilation network model with distributed parameters and local multi-physical field numerical model of rotor. By establishing the global ventilation network model with distributed parameters, the distribution characteristics of flow and pressure in key wind regions are calculated. Based on the result, a 3-D local coupling model of fluid and heat transfer for the rotor is further established to calculate the fluid motion state, heat transfer characteristics of the rotor. The accuracy of the proposed method is verified by comparing the calculated results of the ventilation and temperature with the experimental data.