Liquid droplet radiator (LDR) is a promising cooling system for the high-power spacecraft. The study of the droplet radiation heat transfer mechanism is vitally important for the optimal design of the whole LDR system. Firstly, the radiation heat transfer characteristics of the isolated droplet are analyzed. Then, the Monte Carlo method is used to calculate the angel factor for multiple droplets interacting with each other. Finally, the radiation heat transfer characteristics of the LDR are numerically simulated by the angular coefficient matrix. For two identical droplets, when the ratio of the distance to the radius is greater than 3, the temperature changes of the interacting droplets are the same as the isolated droplets. In addition, the results reveals that tin is the most suitable working fluid for the LDR. These conclusions can lay basis for the optimal design of the LDR and provide guidance for the subsequent research about LDR.

液滴散热器（LDR）是用于大功率航天器的有前途的冷却系统。液滴辐射传热机理的研究对于整个LDR系统的优化设计至关重要。首先，分析了分离液滴的辐射传热特性。然后，使用蒙特卡洛方法来计算多个相互作用的液滴的角度因数。最后，通过角系数矩阵对LDR的辐射传热特性进行了数值模拟。对于两个相同的液滴，当距离与半径之比大于3时，相互作用的液滴的温度变化与分离的液滴相同。此外，结果表明锡是最适合LDR的工作流体。