Simulation of Thermophysical Parameters in the Natural Circulation Evaporative Cooling System of Hydro-generator Stator Busbar

The evaporative cooling technology is a novel type of generator cooling technology, with those advantages of high-safety, high-efficiency and energy-saving. It depends on the latent heat of cooling medium to carry off the heat discharged by generator. In the natural circulation evaporative cooling system of hydro-generator, the gas mass flow ratio and temperature distribution are the key thermophysical parameters of the system. A calculation program was independently developed for the simulation of the operating state of system and the commercial software Ansys CFX was chosen for the simulation of temperature distribution of the cooling medium in the stator busbars. The simulation results show that with the heat load increasing, the gas mass flow ratio and the cooling medium's temperatures in the stator busbars increases. The cooling medium's temperatures along the length of the stator busbars is distributed smoothly. The error between the two simulation methods was lower than 9% under the experimental conditions.