Numerical Simulation For The Large-Scale Motor Stator With Internal Evaporative Cooling

The unit capacity of the generator has been characterized by an increasing trend with expanding power demands. Often included in the enumeration of generator's capacity enlargements are implemented by using additional power load of winding coils as opposed to a concomitant temperature increments. In resolving such problem, a state-of-the-art cooling method that was labeled as"evaporative cooling"with satisfying performance was thus been proposed. In present study, on the basis of two-phase theory and by means of applied programming and numerical simulation software, the programming calculation and numerical simulation on flow dynamics and heat transfer are conducted for evaporative cooling technologies introduced in turbo-generator stator; an expanded view of cooling system at off-design conditions is investigated. The results show that the accuracy and feasibility of the two-phase resistance calculation on proposed model was verified. Furthermore, the evaporating point and temperature-pressure distribution are obtained which allow for a detailed discussion on flow pattern and bubble diameter change afterwards.