MODERN APPROACHES TO COOLING SYSTEM DESIGN FOR AIR-COOLED TURBOGENERATORS

The article discusses modern approaches to the design of the ventilation path of modern high-capacity turbine generators and the main development trends. We present an overview of current technical solutions used by world manufacturing industry leaders, as well as modern high-performance solutions used in ventilation systems of turbine generators manufactured by the Electrosila plant of JSC Power Machines. We consider the main features of modern ventilation schemes used in air-cooled turbine generators and the most effective ways to increase the cooling intensity of the core and stator winding with indirect cooling, which ensures a decrease in the temperature of the active parts while maintaining the cooling air consumption and power consumption for cooling the active parts. Design solutions are proposed to minimize ventilation losses and power costs for cooling air circulation in the rotor. It is confirmed by a numerical experiment, as well as model tests, that due to the rational design of the volute housing of the turbine generator centrifugal fan and the optimal choice of the initial flow twist at the rotor inlet, mechanical losses on turbine generator ventilation can be significantly reduced while maintaining the initial thermal state of the stator and rotor. The results of aerodynamic calculations and experiments confirmed that in high-power turbine generators with air-cooled rotor windings, it is advisable to use a rotating guide vane in combination with a stationary guide vane; the best effect is achieved when using a rotating guide vane in the form of an axial fan.