Study On The Numerical Simulation Of Flow And Heat Transfer In Air Cooling Turbo-generator Stator

Large turbo-generator during operation, the electromagnetic and mechanical lossesinside the motor will produce a lot of heat. If the heat generated by the losses can not bescattered out effectively, this may cause the local temperature rise of the generator is toohigh and affect the operation of the safety and life of the generator directly. Especially forlarge air-cooled turbo-generator, ventilating and cooling systems is an important guaranteesafe and stable operation of the motor. Therefore, the cooling system for the turbinegenerator ventilation flow and heat transfer study has very important significance.Firstly, according to320MW air-cooled turbo-generator’s stator air-cooled ventilationand cooling system features, establishing the fluid field model of stator ventilation systemand the coupling model of flow with heat transfer. and gives the corresponding descriptionof mathematical physics. By using CFD software calculate the stator ventilation systemfluid field model in rated condition, and get the ventilation system detailed flowcharacteristics, such pressure, velocity, flow distribution. On the basis of the calculation ofthe stator fluid field, make coupling solve for the stator field and temperature field.Analyzing the temperature distributions in the generator’s ventilation system and stator,provide some references to ventilation system design optimization and monitoring of theactual operation of the generator. In order to study the air distribution in ventilation systemand air gap radial height impact on flow and heat transfer in the generator, Different airdistribution conditions between air gap inlet and stator back plenum inlet and differentradial height of the air gap structure model programs has been calculated respectively.Conducted a preliminary study in the air distribution system optimization and structuraloptimization, and get some useful conclusions.Thought the numerical simulation study in this paper, there is a deeper understandingof flow and heat transfer in the ventilation system of turbo-generator. The conclusionsprovide some references and recommendations for generator ventilation system designoptimization and operational monitoring.