Calculation of effective emissivity of blackbody cavities by Monte-Carlo method
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摘要: 介绍了蒙特-卡罗法计算黑体空腔发射率的基本思想和主要算法。首先阐述了计算黑体空腔有效发射率的理论基础,然后分别从正向光线追迹和逆向光线追迹的角度对蒙特-卡罗法的具体算法予以说明,提出逆向追迹思想能方便地计算空腔的定向有效发射率,经过运算可以得到腔积分半球有效发射率和平均垂直有效发射率。最后对比了采用蒙特-卡罗法和其它方法的计算结果,分析表明:蒙特-卡罗法在计算黑体空腔有效发射率上是准确的,劣势在于计算速度慢。Abstract: Calculation of the effective emissivity of blackbody cavities by the Monte-Carlo method is reviewed. Firstly, the theoretical basis of Monte-Carlo method is expounded, and then the forward and backward ray tracing methods are illustrated. Compared with the forward ray tracing method, the backward ray tracing method can easily calculate the directional effective emissivity, and can get average normal effective emissivity and the hemispherical effective emissivity. Finally, the Monte-Carlo and theoretical calculation methods are compared, and it is confirmed that Monte-Carlo method is accurate in calculating the effective emissivity of blackbody cavities, whereas the disadvantage is slow computing speed.
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