辐射换热通常按三维方法计算。本文针对具有二维特征的辐射换热问题 ,提出一种降维处理方法。与三维方法不同的是 ,降维后的辐射强度 I2 D是在二维系统平面角的概念上导得的 ,其值为辐射力 E的一半 ,即 I2 D=E/ 2。经过降维处理后的数值方法使得具有二维特征辐射传热问题的计算得到极大简化。对含有参与性介质的圆筒形腔体和无限长方腔内的热特性进行计算 ,并将计算结果与按三维辐射计算的结果或精确结果进行比较 ,两者取得良好的一致性 Radiative heat transfer is usually calculated by three-dimensional method. Aiming at the problem of radiative heat transfer with two-dimensional features, this paper proposes a method of dimensionality reduction. In contrast to the three-dimensional method, the dimensionally reduced radiation intensity I2D is conceptually derived from the planar angle of a two-dimensional system and has a value of half of the radiation E, ie I2D = E / 2. The numerical method after dimensionality reduction makes the calculation with two-dimensional characteristic radiative heat transfer greatly simplified. The thermal characteristics of the cylindrical cavity and the infinite cavity containing the participative medium are calculated and the results are compared with the results calculated by the 3D radiation or the exact results to obtain a good consistency between the two