Based on the results of a coaxial and radial heat pipe in different conditions and fluid filling rate, the temperature and velocity distributions of the internal working fluid of heat pipe were simulated. The results show that the saturated steam becomes superheated steam during ascent, then collides with each other when facing the head of steam in the top, and its flow velocity almost reaches zero. At this time, the heat transfer between steam and cold fluid is mainly conduction, and the working fluid temperature reaches the highest. The steam working fluid rises along the radial and a backflow phenomenon occurs in the top, the velocity of steam working fluid has a minimum value and its condensation velocity gets the maximum. The temperature distribution of the wall increases from the bottom of the heat pipe to its top. When the horizontal coordinate x changes from 7.5 to 22.5 mm, the temperature of the heat pipe with a 50% fluid filling rate has a steep rise, and then becomes gentle. The relative error of the simulation results to experimental results is less than 5%.%基于不同工况、不同充液率下的同轴径向热管实验结果,利用数值计算的方法对热管内部工质进行模拟研究.研究结果表明:饱和蒸汽在上升过程中受热逐渐成为过热蒸汽,在顶部遇到迎面蒸汽时相互碰撞,流速几乎为零,此时蒸汽换热以导热为主,工质温度达到最高值；蒸汽工质沿径向上升在顶部出现回流现象,冷却水管壁顶部区域速度最低,冷凝速率最大；管壁温度分布由热管底部到热管项部逐步上升,充液率为50％的热管,当横向坐标在7.5～22.5 mm区间内时,温度接近于线性上升,之后上升幅度变小.数值模拟结果与实验数据基本吻合,其相对误差小于5％.
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