高温黑体空腔有效发射率的计算

Calculate on Effective Emissivity of High-temperature Blackbody Cavity

建立了圆筒形黑体空腔模型，分别基于积分方程法、有限元分析法、Monte-Cado法对该黑体空腔的有效发射率进行计算，并对比分析了不同腔体几何形状、腔体材料发射率、探测器距腔口距离等因素对黑体空腔有效发射率的影响。结果表明：在相同长径比、孔径比、材料发射率等条件下，长径比较大、孔径比较小、腔体材料发射率较大时黑体空腔有效发射率较大。

The model of cylindrical blackbody cavity is established, based on the integral equation method, finite element analysis method, Monte-Carlo method , the effective emissivity of blackbody cavity is calculated, and comparison and analysis the different cavity geometry, cavity material emissivity , the probe distance from mouth cavity and other factors have impact on the effective emissivity of the blackbody cavity. The results show that under the same cavity length to diameter ratio, the aperture ratio, material emissivity and other conditions, namely the length to diameter is larger, the aperture ratio smaller, the cavity material emissivity larger then the blackbody cavity have larger effective emissivity.