HL-2M装置第一壁传热结构设计及传热性能测试

Design and performance test of thermal transfer structure of first wall on HL-2M tokamak

在HL-2M第一壁传热结构设计中,利用导热管的轴向快速导热特性及较短的传热路径,将面对等离子体的第一壁表面热量快速传至真空室内壁上。第一壁背板和真空室内壁上分别焊接导热铜块作为冷热连接端,导热管嵌入其内,导热管与铜块之间增垫导热金属箔并用压板固定压紧,以增强接触界面传热。根据此传热结构设计,设计加工了相应的传热性能测试试验件。通过对试验件进行传热性能测试及实验条件外推可知,试验件冷热端面间的最大传热功率为4kW,端面间最大对流换热系数为6k W·m-2。

In the design of thermal transfer structure of first wall on HL-2M tokamak,the heat loads on first wall surface facing plasma are transferred rapidly to the vacuum vessel wall by using the characteristic of fast heat transfer in direction of the heat pipe axis.As the cold-heat connection ends,the heat sink is welded respectively on the backboard of first wall and vacuum vessel wall,while the heat pipe is embedded into the heat sink.The metal foil is inserted into the gap between the pipe and the sink for heat transfer enhancement,and is fixed by a keep plate to enhance the heat transfer of the contacting interface.A testing prototype according to the heat transfer structure design is manufactured.The performance of prototype of heat transfer structure is tested.It shows that the maximum heat transfer power is 4 kW and the maximum equivalent convective heat transfer coefficient is 6 kW·m-2 between the cold end and heat end of the prototype under the experimental and theoretical extrapolation conditions.