计量学报2025，Vol.46Issue(4)：499-504,6.DOI:10.3969/j.issn.1000-1158.2025.04.05
等温腔式黑体内壁面局部发射率变化对空腔发射率的影响研究
Effect of Wall Local Emissivity Variation on Cavity Emissivity of Isothermal Cavity Blackbody
摘要
Abstract
Cavity blackbody is a commonly used radiation source in the field of thermal metrology,and the emissivity of its inner wall material is an important factor affecting the emissivity of the blackbody cavity.Therefore,the integral emissivity of the blackbody cavity is simulated by the finite volume method,and the results are compared with those obtained by the Monte-Carlo method.The influence of the material emissivity variation of the cavity wall and the inner wall of the cavity bottom on the emissivity of the blackbody cavity under different aspect ratios is simulated and calculated,and then the influence of the local material emissivity variation on the emissivity of the blackbody cavity is discussed.The results show that the deviation between the finite volume method and Monte-Carlo method is less than 0.1％.When the emissivity of the bottom wall is above 0.3 and the aspect ratio L/R>5,the change of the integral emissivity of the cavity is less than 0.002.The change of the wall material emissivity has a more significant effect on the cavity integral emissivity.When the wall emissivity is changed from 0.8 to 0.5,the change of the cavity integral emissivity is more than 0.09.When the local wall material emissivity changes,the change of the integral emissivity of the cavity gradually increases as the axial relative position is closer to the cavity opening.关键词
热学计量/等温腔式黑体/壁面材料发射率/有限体积法/空腔积分发射率Key words
thermometrics/isothermal cavity blackbody/wall material emissivity/finite volume method/cavity integral emissivity引用本文复制引用
杨成志,安保林,赵云龙,宋旭尧,陆规,董伟,王琪雯,叶强,李元媛..等温腔式黑体内壁面局部发射率变化对空腔发射率的影响研究[J].计量学报,2025,46(4):499-504,6.基金项目
国家重点研发计划(2023YFF0615003) （2023YFF0615003）
