中文摘要：

辐射散热是人体显热散热的重要途径，决定着人体的热舒适和飞机客舱内流场的分布，是分析和设计健康舒适客舱环境的重要因素．针对客舱中人员的辐射散热问题，在简化的半机舱模型中通过实验研究自然对流状态下单体坐姿仿真人体辐射散热；并选择CFD提供的DTRM、DO、S2S辐射模型进行数值预测．研究显示默认划分射线数量的DTRM模型可以精确预测人体各部位的辐射换热量，但创建射线文件比较消耗计算机资源，单核运算最大消耗25％的CPU进程，计算时间相对适中．DO模型的计算精度强烈依靠经度角和纬度角的划分，计算时间偏长，但不需要消耗瞬时大量的CPU进程．相比前两者，在计算时间和人体壁面网格数量（表面束的划分）方面，S2S辐射模型有较大的优势．结果表明CFD具有精确预测人体辐射散热的能力，可为以后室内环境研究者提供方法和参考．

英文摘要：

Radiation is an important approach to sensible heat loss and decides the thermal comfort and distribution of flow fields in aircraft cabin. Therefore, it is a crucial factor for analyzing and designing healthy and comfortable in- door climates. With regard to the radiation heat loss of passengers, a seated thermal manikin was studied under natu- ral convection in a simplified semi-aircraft cabin, three radiation models provided by computational fluid dynam- ics （CFD） including discrete transfer radiation model （DTRM）, surface-to-surface radiation model （$2S） and discrete ordinates radiation model （DO） were selected to predict the radiation heat loss of body segments. Results show that DTRM with default settings could predict radiation heat loss accurately, but its ray file needs considerable computing resource. Single-core operation consumes 25% of central processing unit （CPU） at most, and its computation time is relatively moderate. The accuracy of radiation heat transfer coefficient calculated by DO greatly depends on theta and phi divisions. Although the computation time is much longer, it does not consume more a large amount CPU cycle instantaneously. $2S radiation model has a better performance in terms of both computation time and grid meshing on human body （cluster divisions）. Meanwhile, CFD is proved to be capable of predicting the radiation heat release accurately. The method and results of the study could be helpful for researchers of indoor environment.