LAMOST围挡通道的壁面传热影响分析

Analysis of Thermal Convection and Conduction in the Dome of LAMOST

运用热分析软件Icepak对望远镜LAMOST的圆顶围挡通道进行了热计算与分析,重点分析了围挡壁面的热辐射和热传导对整个温度场的影响。在通风管道冷却方案的基础上,分别建立了壁面辐射和传导的热模型,描述了壁面的传热结构。仿真计算了增加壁面热辐射和热传导时主光学组件——焦面的温度场分布,并对此作了对比分析。数值计算与仿真结果表明:壁面传热对其内部温度场的影响不大;利用通风管道的冷却措施可将焦面的最大温度梯度控制在0.4℃/m;围挡的特性结构对传热有效。

A software of thermal analysis ,Icepak,is used to calculate the heat exchange in enclosing channels of LAMOST. The effect of the thermal radiation and conduction of the enclosed wall surface on the whole temperature field is emphatically analyzed. Based on the cooling scheme of ventilating duct, the models of the thermal radiation and conduction are set up respectively, and the heat-transfer structure on the walls in the dome is described with them. The temperature filed distribution of the main optical assembly （focal surface） is calculated with a simulation method when the thermal radiation and conduction on the wall surface are increased, and the calcution results are compared and analyzed. The numerical calculation and simulation results show that the effect of the wall surface heat transfer on its internal temperature field is not serious, the cooling shcheme of ventilating duct can control the maximal temperature gradient on the focal surface within 0. 4 ℃/m successfully and the characteristic structure of enclosed wall is effective on the heat transfer. The conventional cooling project is still powerful with the new structure of the walls. The thermal analysis and simulation are helpful to the theoretical study on the seeing and the design of the LAMOST dome.