Thermal And Hydraulic Analysis Of The Sheild Blanket In ITER

Shield blanket is a very important part of the International Thermonuclear Experimental Reactor. The main functions of the shield blanket are neutron shielding and removing the heat deposition. During the operational time of the ITER, 80% of the fusion energy depositing in the shield blanket will be removed by the cooling water. It is important to analyse the rationality of the structure of the shield blanket with the thermal and hydrodynamic method, in order to assure that the shield blanket can be cooled efficiently and uniformly. In this article, No.4 shield blanket is analysed and optimized with the thermal and hydrodynamic method based on the theory of computational fluid dynamics.This article, firstly, introduces the distributing and the structure of the shield blanket in the ITER. The following part introduces the structure of the channel in the No.4 shield block. After that, the first wall, radial holes and front header are analysis. The CFD analytical methods are adopted, due to the complex structure in the shield block. Finally, the velocity field and temperature field in the shield block is achieved, by two and three dimensional calculation. According to that, the rationality of the structure is judged.The results indicate that the cooling of first wall can meet the request of design. It also indicates that the flow distribution in the radial holes is not very uniform, because of the different resistance in each hole. In this article, that problem can be solved by changing the length of the flow driver in the blind holes and adjusting the gap between the flow driver and the wall of the hole. It can balance the resistance in the different holes. In the results, it also confirms that the front lid of front header can't be cooled adequately and uniformly. In this article, the flow driver is improved based on the current flow driver. The velocity field in the front header and temperature distribution on the front lid are achieved. The cooling results, in both adequate and uniform, are largely improved. It can meet the design request of ITER.