为减少S-CO2水平管内流动换热实验中由于管道周向温度分布不均匀而导致的内壁温计算误差，本文首先介绍了目前应用最广泛的基于一维稳态导热微分方程的内壁温计算公式和热平衡法的计算方法，通过理论分析提出了基于体积发热率的计算控制体内热源发热功率方法以及底层节点再计算方法，扩展了热平衡法的使用范围，并有效提高了热平衡法的计算精度。接着通过进行S-CO2水管加热管周向测温实验，根据实验数据提出了使用温度比例计算侧面假设温度作为初始温度节点的方法，使单个节点上使用热平衡法需要布置的热电偶数量减少至2根，有效降低了使用热平衡法的实验成本与实验准备的繁琐程度。

To reduce the calculation errors caused by the uneven circumferential temperature distribution in the flow boiling heat transfer experiments of supercritical carbon dioxide (S-CO2) inside tubes, this paper first introduces the most widely used calculation formulas for inner wall temperature based on the one-dimensional steady-state heat conduction differential equation and the method of thermal equilibrium. Through theoretical analysis, it proposes a method for calculating the heat generation power inside the control volume based on the volumetric heat generation rate and a method for recalculating the bottom layer nodes, extending the applicability of the thermal equilibrium method and effectively improving its calculation accuracy. Subsequently, through conducting experiments on temperature measurement around the heating tube of S-CO2 water pipes, a method is proposed to use the temperature ratio to calculate the assumed temperature on the side, reducing the number of thermocouples required for the thermal equilibrium method to 2, thereby effectively reducing the experimental cost and the complexity of experimental preparation required by the thermal equilibrium method.

国家自然科学基金项目（面上项目，重点项目，重大项目）