The Finite Element Calculation For Important Components Of Large Generator

In the nuclear power plant,the steam generator is the inportant parts of normal operating condition.The tube is direct contact with fluid of primary and secondary loop in the steam generator,except the ability of heat exchange also prevent radioactive substance into the secondary loop damage other components in the plant.In addition,the transfer tube's heat efficiency of SG is closely related to the nuclear power,it plays an important role in the nuclear power plant.In order to improve the efficiency of heat transfer in the design and manufacture of plant,the tube' wall is very thin.The fluid velocity in inside and outside of transfer tubes is very fast and to transfer heat,the bad working condition can easily affect the transfer tubes.The requirements of structure strength,compressive properties and anticorrosive ability are very high.Once tubes break,the influence to the nuclear power plant would be great and may lead to plant shut down.Fully considering the influence of temperature field and the coupling effect between the physical fields,the finite element software ANSYS was used for thermo-fluid-so lid coupling analysis in helical transferring tube of SG in SMART reactor.The resulting stress,strain and deformation of the tube were calculated.Compare with the results of fluid-solid coupling analysis,to explore the influence of temperature field on the spiral tube.In wind turbines,the high-speed brake is an inportant part and which is installed on the brake mounting bracket of gear box.High-speed brake's main function is to using hydraulic power through the brake pads locking brake disc to brake.The heat flow is generated due to friction between the brake disc and brake pads under braking condition,the heat flow into the work surface can make the surface structure deformation and the brake doesn't work.Brake discs connected directly on the main shaft is not easy to change,once the damage will cause a great economic loss and serious influence the efficiency of the fan.So,it is necessary to analysis the system performance of high-speed brake.The second part in this paper,considering the friction heating,heat transfer and heat dissipation,the finite element software ABAQUS was used for thermo-structure coupling analysis of high speed brake friction pair.Observe the dynamic distribution of stress and temperature with the braking time.Engineering algorithm is used to determine the heat flux density and convection heat transfer coefficient under the braking process,and the calculated results as the load boundary to simulate.Using the above two ways to calculate the equivalent stress and the node temperature changes along with time,the S-N thermal fatigue curve for the brake disc is calculated,compared to explore the fatigue mechanism of brake disc.