Research On Thermo-structural Analysis And Optimization Of The First Wall In DEMO-HCSB

Nowadays, Energy has been more and more prominent problem which has a crucialinfluence on the development of economy. Explicitly, the scarcity of chemical energy andpollution to the environment, for example,the damage on the balance of ecosystem, theemission of the greenhouse gases and the pollution of air, have been the challenges whichhuman being has no reason to ignore. Therefore, the mode of efficiency, clean andfriendly-to-environment energy which replace the traditional fossil energy become moreurgent. The fuel required by the nuclear fusion in the nature is extremely rich, its product islow radioactive and little destroyed on the environment. If fusion reactor can be make upsuccessfully，it could bring limitless fusion energy to human being. Fusion energy has beenviewed as one of the most effective solution.Blanket Module for converting energy is the critical part in the Demonstration FusionReactor(DEMO), which can obtain the power in the high-temperature environment andwith low cost of power generation. He-Cooled/Solid Ceramic/Be/F/M Steel (HCSB) is oneof the most popular cooling schemes and designations that has been utilized among manycountries around the world. FW of the Blanket Module is the object of study in the paper.The objective target is the analysis of the intensity of the Be/Eurofer97layer structure withheat load, the research on the optimization of the structure and the dynamic characters ofFW by coupling approach.In this paper, Firstly, the strength characteristics about layer interface of theheterogeneous material is simulated. It turned out that the stress reaches the maximumaround the interface, yet descend very rapidly in the interface.The thickness of the middletransition layer has influence on the distribution of stress and temperature about theBe/Eurofer97layer structure and the character of the whole FW. Moreover, a coupled codeCFX/SIMULATION in the ANSYS Workbench is used. The distribution of the stress andtemperature can be obtained by one-way coupling approach to attest the allowablerequirements of the shield armor and heat sink structure respectively.By altering the thickness of the shield armor, the structure of the cooling channel andthe front thickness of the heat sink structure, the temperature and stress distribution in the FW is analyzed. Based on the results of the various kinds of influence, an optimized designscheme is proposed on the modification of the thickness of the shield armor, the structure ofthe cooling channel and the front thickness of the heat sink structure. The optimized FWcan reduce the maximum temperature and stress respectively in the shield armor and heatsink structure.With regard to the structure mechanical analysis of the optimized FW, the naturalfrequency and the mode of vibration are obtained in order to prevent the fatigue, collisionand deformation. Upon this foundation the next step comes to the calculation of theamplitude. With the method of the two-way fluid-solid interaction, it can be used to analyzethe vibration phenomenon when the high-speed fluid flows in the cooling channel of FW.All of these could be viewed as the foundation to the subsequent analysis about BlanketModule.In this paper, research about design, thermo-structural analysis, structure optimizationand vibration of first wall that has been done has the meaning to improve the overallmechanical performance and reliability of first wall.