关键词: 托卡马克, 正交设计, 第一壁, 传热分析

Abstract: Following the plasma parameters of the HL-3 tokamak gradually improving, the thermal loads that the first wall needs to withstand also gradually increase, especially the residual power of the first wall at the neutral beam shine-through area would be more than 1.0 MW·m^-2 and duration 5 s. Based on the thermal conduction and the convective heat transfer equations, numerical simulation and parameters optimization were conducted on key first wall structural design variables influencing the heat transfer performance, such as the graphite thickness, heat sink plate thickness, flow channel diameter and thermal contact conductance between combined surfaces in the high flux zones, using the orthogonal experimental technique. The results indicate that the above four factors are reversely correlated with the surface temperature of first wall for HL-3 tokamak pulsed plasma operation. Besides, the graphite thickness is the greatest impact on the heat transfer performance of the carbon-based first wall, followed by the thermal contact conductance between the graphite and the heat sink plate,while the thickness of the heat sink plate 316L and the cooling pipe diameter are relatively low impact on that.

Key words: Tokamak, Orthogonal design, First wall, Thermal transfer analysis