Research Of Analysis And Testing For Blanket Support Of Fusion Reactor

Tokamak devices are currently recognized in the world as the most likely devices to implement magnetic confinement fusion,and it is very likely that this device will be used to achieve fusion energy power generation in the future.One of the most important components of nuclear fusion devices is the blanket system.The blanket system is the fundamental guarantee for self-sustaining combustion of nuclear fusion devices.The blanket support is an important component that fixes the blanket system to the vacuum chamber and it carries all the loads from the blanket.Due to the alternating current caused by the vertical displacement event during operation of the tokamak device,an alternating magnetic field is generated,so that the blanket module generates eddy currents,and the eddy current induces the formation of electromagnetic force in the blanket.The blanket support serves as an important connecting part in addition to the electromagnetic force on the blanket,and the electromagnetic force generated on the blanket during the operation of the tokamak apparatus is a discontinuous cyclic load,and the blanket support needs to withstand the electromagnetic according to design requirements.The load is applied 10,000 times without failure,so 10,000 fatigue simulations of the blanket support under this electromagnetic force are required to meet the design requirements.The blanket and the blanket support are fixed by welding.When the blanket support is fatigue tested,the welding performance of the welding part is also tested to ensure that the blanket support design is safe and reliable.In order to complete the design analysis and experimental research of the blanket support structure,this paper mainly completed the following work:1.Design blanket support.Through the investigation of the relevant data of the domestic outsourcing layer support,three kinds of blanket support structure schemes were designed.Finally,a four-mechanical bond type of support scheme was selected.The program uses a cross-cut slot that absorbs some of the thermal stress and reduces the deformation of the support structure.2.blanket electromagnetic simulation.Based on ANSYS finite element analysis software,APDL parametric language programming was used to realize the electromagnetic simulation of the blanket under special vertical displacement conditions.By transiently simulating the eddy currents between the magnet coil and the plasma and the blanket,the electromagnetic force of the blanket is calculated.3.Stress analysis and fatigue simulation of blanket support under electromagnetic force.By applying the electromagnetic force that changes with time to the blanket support,the maximum stress at the blanket support and the maximum stress range are analyzed.Using ANSYS fatigue simulation module to simulate the stress fatigue under the maximum stress,The fatigue loss of 0.00769 under fatigue is met,which meets the design requirements.4.Weld seam fatigue test and welding performance analysis between blanket and support.Through experiments,the welding method and welding performance between blanket and support were analyzed.TIG welding and electron beam welding were performed on two types of specimens using a fatigue tester,and non-destructive testing and metallographic analysis were performed on the specimen after the experiment.The analysis and experimental results show that the simulated data of TIG welding and electron beam welding fatigue analysis are close;the two kinds of welding samples have high weld penetration before and after the test;the electron beam welding sample parts have complete microstructure and performance at the base metal and weld seam.The grain size distribution is basically uniform,and the TIG welding sample base material and weld seam have complete organizational performance,and the grain size distribution is irregular.Therefore,in engineering applications,if the stress range is low,TIG welding can be used instead of electron beam welding.