Research on the flow characteristics of different cooling medium in the inner evaporative cooling turbo-generator

In the inner evaporative cooling turbogenerator, the cooling medium flows in the hollow conductor of stator and the cooling system depends on the sensible heat and latent heat of cooling medium to achieve the cooling goal of generator. Due to each cooling medium has unique thermal properties, the flow characteristics of different cooling medium in the hollow conductors is disaffinity. In this paper, two kinds of cooling medium were chosen as the study objects. Through simulating, the flow resistances of different cooling medium in the hollow conductors under different working conditions were compared. The exit dryness and the lengths of two-phase section in the hollow conductors were also discussed and the reason of the discrepancies were analyzed. The simulation results of flow resistances were compared with the experimental data and the accuracy of simulating prediction is satisfactory.