本文建立了1∶10的二维钢制安全壳外侧辐射换热和自然对流模型，并用先进流体计算软件Fluent对流场进行计算，得到了完整流道下的速度流场、钢制安全壳上封头顶部的空气速度矢量图，并得出钢制安全壳上封头顶部存在空气滞留区的结论。分析了通道宽度、空气进流速度及壁面黑度对通道换热的影响，结果表明：适当的通道宽度和空气进流速度均能提高通道的换热和换热效率；壁面黑度的提高能明显增强钢制安全壳上封头处的辐射换热。%A 1∶10 2D model of radiation heat transfer and natural convection outside the 2D steel containment was established in this paper .The advanced computational fluid dynamic analysis software Fluent was applied to complete the calculation . The velocity nephogram and the velocity vector diagram on the head of steel containment were obtained ,and the results show that there is an air stagnant zone on the head of steel containment .The influence of channel width ,airflow speed and emissivity of wall surface on heat transfer was studied as well .The appropriate channel width and airflow speed can enhance the heat transfer and the efficiency of heat exchange .T he increase of the emissivity of wall surface can obviously improve the radiation heat transfer on the head of steel containment .
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