Simulation of Self-Driven Evaporative Cooling System in Large Capacity Permanent Magnet Machine

Self-driven Evaporative Cooling System has many advantages to cool the stator of large capacity permanent magnet machine. The two-phase flow distribution of self-driven evaporative cooling system in the cooling channel does directly affect the cooling efficiency of stator. This paper introduces the simulation method of two-phase flow for self-driven evaporative cooling system, analyses the structure of stator cooling system and two-phase flow channel in the stator. The special two-phase flow CFD simulation model is built and the simulation gives the velocity and volume fraction distributions in the cooling channel, which are the basis for evaluation of cooling capacity. In order to analyze the influence of different influential factors on the distribution of flow field, a variety of simulations are carried out under different conditions, and the results are compared.