超临界水流化床是应用于生物质气化制氢工程的新型反应器。为了获得超临界水流化床内流体与颗粒的传热特性,本文对超临界水条件下单颗粒绕流传热进行数值模拟研究,并与经验关联式进行比较,验证了模型的有效性。研究结果表明变物性条件下努塞尔数比常物性条件下大,重力对低雷诺数条件下颗粒绕流传热影响较大,当绕流在球形颗粒后出现尾涡时,重力对尾涡部分传热有抑制效果。这些结论为进一步研究超临界水流化床内传热奠定了基础。 Supercritical water fluidized bed is a new reactor used in biomass gasification hydrogen production project. In order to obtain the heat transfer characteristics of fluid and particles in supercritical water fluidized bed, numerical simulation of single-particle convective heat transfer under supercritical water conditions is carried out and compared with empirical correlation to verify the effectiveness of the model. The results show that the Nusselt number under variable conditions has a greater influence on the convective heat transfer of the particles under the conditions of low Reynolds number than those under the normal conditions. When the wake flows around the spherical particles, the influence of gravity on the wake vortex Heat transfer has inhibitory effect. These conclusions lay the foundation for further study of heat transfer in supercritical water fluidized bed.