Energy Field Simulating of Heat Transfer Capability and Damage Evaluation on an Improved Langmuir Probe

摘要

In this paper we proposed a advanced Langmuir probe (LP)-cooling monoblock (CM) model used in Tokamak of controlled thermonuclear fusion, this model adopted several novel designs used for improving the heat transfer capability. In the transient thermal analysis, the effect of conical degree of AL_2O_3 ceramic barrel on the thermal contact resistance at the interface of different materials has been systematically studied and a reasonable explanation was given for the phenomenon where the increasing of conical degree lead to the decreasing of thermal contact resistance. Moreover the top part of CM of the plasma facing unit was prepared by pyrolytic graphite can make the temperature of LP obviously reduced. Eventually the thermal state of LP during the 400 s pulse are figured out by ANSYS under optimal loading conditions, the calculation results showed the maximum temperature of LP is 2,253℃ at 211 s, meanwhile, the basic characteristics for variation of the maximum temperature of LP with the incident heat flux are presented. These results obtained in this work are helpful to reveal the thermal energy state of LP more accurately, reduce the damage on the device, and improve its working stability.