Hydraulic Analysis Of The Pipe Styles Of The Flow Driver In The Sheild Blanket Of Iter

In International Thermonuclear Experimental Reactor (ITER), the shield blanket is an important part with two main functions: a) shielding the neutrons produced in the fusion process; b) transferring the heat generated from the fusion to the outside. During the operational time of the ITER, the cooling water will remove 80% of the fusion energy depositing in the shield blanket. Therefore, in order to guarantee that the shield blanket has uniform and sufficient cooling effect, it is very necessary to carry out the hydraulic analysis of the rationality of the shield blanket structure. The flow driver, an element in the shield blanket is to be analyzed in this thesis. The main content is the hydraulic simulation of different types of flow divers based on computational fluid dynamics (CFD) so as to improve their properties.In this paper, firstly, the development of ITER is introduced. Then the main part of ITER which is also the topic of this paper, that is the flow driver of the shield blanket is described. The flow driver and the wall of pipe form a circular flow channel, which makes the flow cross-section decrescent, improves the cooling water circulation and enhances the heat transfer between the fluid and the pipe. Secondly, it is found that there may be some problems in existing pipe. Therefore, the physical model and calculation methods are proposed and realized. Finally, after simulation and comparison of some different improved types of flow drivers with the original type, conclusions are drawn.After simulation, it can be concluded that: using the model and the corresponding grid, the outlet flow is stabilized when the shape of the pipe is modified as tapered pipe, which can reduce the energy consumption of disturbance and increase the velocity of flow. For different types of flow driver, A-type flow driver and B-type flow driver, different types of tubes should be chosen when the flowing direction is different. B-type flow driver produces more vortex flow and disturbance than that of A-type. In conclusion, through the calculation and analysis of improvement scheme, it is found that when the shape of the outlet of flow driver is modified as tapered type, the flow field is obviously stabilized.