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本文提出了计算非等温漫射黑体空腔壁表面局部有效发射率的一种Gou-ffe型新公式,描述了等温和非等温漫射圆锥和圆筒形空腔的应用。典型实例的计算结果和严密的积分方程求解结果精确一致。引进到公式中的两个参量——平均几何因子和温度修正因子,表明了空腔几何形态和温度分布对发射率的影响。对非等温腔也进行了计算和讨论(如它与特定参考温度选取的关系),并分别定义了相对发射率和绝对发射率。
In this paper, a new Gou-ffe formula for calculating the local effective emissivity of non-isothermally diffuse blackbody cavity wall surfaces is presented. The application of isothermal and non-isothermal diffuse conical and cylindrical cavities is described. The calculation results of typical examples are exactly the same as those of the exact integral equation. The two parameters introduced into the formula - the average geometric factor and the temperature correction factor - indicate the effect of cavity geometry and temperature distribution on emissivity. The non-isothermal cavity is also calculated and discussed (as it relates to the selection of a particular reference temperature) and defines the relative emissivity and absolute emissivity, respectively.