Fluid Flow And Temperature Field Simulation Of Large Turbo-generator

With the unit capacity of turbo-generator increasing, the importance of the generator cooling system is more prominent. Heat dissipation of cooling system whether can be secure and timely affects the secure and stable running of entire generator. Especially when the cooling system occurs faults, how early detection and timely remedy so as to avoid the generator accident become hot topic of research departments concerned. Therefore, it has important significance to study generator cooling system in detail.This paper uses the FLUENT numerical simulation software to calculate and analyze flow and temperature field of 150 MW air cooled turbo-generator with rotor ventilation ditch blocked and stator steady velocity and temperature fields of a QFSN-220-2-"water-hydrogen" turbine generator. 2-D mathematical and physical model of flow and heat transfer inside the rotor radial ventilation ditch with blocking issue of the turbo generator with air coolant and 3-D mathematical and physical model of flow and heat transfer inside the stator of the "water-hydrogen" turbine generator are established in this paper. Respectively through differentiate grid and calculation, rotor temperature distribution when air cooled turbo-generator with rotor one ventilation ditch blocked and steady temperature, hydrogen, cooling water flow rate distribution map of "water-hydrogen" turbo-generator stator are obtained. Through the analysis of the results of calculation, the relationship between rotor temperature and the extent of blocking is analyzed. It lays the foundation for early diagnosis of fault and correct formulation of repair cycle. At the same time, through analyzing at length the steady temperature and hydrogen, cooling water flow rate distribution map of "water-hydrogen" turbo-generator stator, concluded that their most hot spot locations and stator detailed temperature distribution. It provides a basis for accurate stator temperature monitoring points.