The Research Of Leading Edge For Tungsten Tile Of First Wall In Tokamak

As one of the most important components of the Tokamak , the first wall especially divertor has to bear high heat load and ion flux during its lifetime.Modular discrete design is adopted in the first wall such as ITER and EAST. The gap and misalignment will lead to the local overheating at the leading edge. For the material of tungsten, the consequences of local overheating phenomena is more serious. In order to alleviate local overheating effect,it is necessary to optimize the design of tile surface shape.This paper comes up with 3 kinds of designs which are symmetricial chamferunsymmetrical chamfer and B-Spline surface. The sampling points in design variable space is derived by uniform design. After the experimental designing ,the finite element model is built by ANSYS , the output of ANSYS is the highest temperature of tile which will be put into the kriging model in DACE. The response surface is constructed and the tile shape which has lowest value of temperature is got from it. The result shows that under the 200MW/m2 parallel heat flux the single side chamfer(19.45×0.86mm) is the best solution in the view of temperature, thermal stress, calculating complexity. The direction of toroidal current may change when revising the magnet filed. So symmetricial charmer is applied when the conclusion which toroidal current does change the direction is conformed. The convective heat transfer coefficient can influnce the temperature distribution obviously. Swirl tape tube is considered in this paper, the highest temperature can be reduced from 2084℃ to 1500℃compared with smooth tube in single side chamfer.The infrared image is got in 2015 EAST experiment campaign from H port. The cassette module which has chamfered tile was tested. The result indicates that the particle flux can be shadowed by chamfer,the temperature is reduced. When the long pusle is applied ,the temperature will rise significantly and the distribution of temperature is more inhomogeneous.That means the shape and machining precision of tile is important for temperature distribution.