基于实验数据对管内超临界二氧化碳强迫对流传热中浮升力效应进行了数值研究。研究表明:较低质量流速和较高热流密度工况下,浮升力作用明显,进而引起流道径向和轴向速度重新分布,浮升力较强时甚至出现径向M形速度分布;当M形速度分布对应的零速度梯度点出现在粘性底层边缘时会明显弱化湍流的生成和扩散,引起传热恶化。基于实验工况的拓展计算表明:降低壁面热流密度、增大质量流速以及提高入口温度可以不同程度地缓解浮升力效应引起的传热恶化。 Based on the experimental data, the numerical study of the buoyant force effect in forced convective heat transfer by supercritical carbon dioxide in the tube was carried out. The results show that under the condition of lower mass flow rate and higher heat flux density, the effect of buoyancy force is obvious, and then the radial and axial velocity redistribution is caused. When the buoyancy force is strong, the radial M-shaped velocity distribution appears. When M The zero velocity gradient point corresponding to the shape velocity distribution appears to weaken the formation and diffusion of turbulent flow when it appears at the edge of the adhesive bottom, causing the heat transfer to deteriorate. Based on the experimental conditions, the extended calculation shows that reducing the wall heat flux, increasing the mass flow rate and increasing the inlet temperature can alleviate the heat transfer deterioration caused by the buoyancy effect to varying degrees.