对超临界压力下RP-3在竖直细圆管内对流换热进行了实验研究。分析了变物性,浮升力、热加速等对流动换热的影响,并对已有关联式进行了修正。结果表明:在入口雷诺数4500的实验中,流动换热主要受变物性的影响,浮升力和热加速对流动换热的影响可忽略;在入口雷诺数为2500的实验中,在向上流动和高热流密度时,浮升力引起传热恶化,换热系数明显降低。 Experimental study on convective heat transfer of RP-3 in vertical thin circular tube under supercritical pressure was carried out. The influence of variable properties, buoyancy force and thermal acceleration on the flow heat transfer was analyzed, and the correlative formulas were revised. The results show that the flow heat transfer is mainly affected by the change of physical properties at the inlet Reynolds number of 4500, and the influence of lift force and thermal acceleration on the flow heat transfer can be neglected. In the experiment with inlet Reynolds number of 2500, When the heat flux is high, the heat transfer is deteriorated due to the buoyancy force and the heat transfer coefficient is significantly reduced.