高温、高流速氢气在圆管内流动换热特性研究

为探究工质在核热推进反应堆冷却剂通道内的热工水力行为，基于数值计算方法，开展了圆管内高温、高流速氢气流动换热特性研究。通过与实验数据对比发现，采用压力基耦合算法、SST k-ω湍流模型以及物性模型进行高温、高流速氢气流动换热特性数值模拟是合理可行的，计算值与实验值符合较好，计算模型选择正确。在分析基础工况流场与温度场的基础上，还研究了热工参数对氢气管内流动换热特性的影响，结果表明，随质量流量的增大换热效果增强，随热流密度的增大换热效果变差。研究方法与结果可为高温、高热流密度环境下气体工质流动换热特性研究、核热推进反应堆的热工设计与仿真模拟提供参考。

Heat Transfer Performance of High Temperature and High Velocity Hydrogen Flow inside Circle Tube

In order to investigate the thermo-hydraulic characteristics of working fluids in the coolant channel of nuclear thermal propulsion reactors, the flow and heat transfer performance of high temperature and high velocity hydrogen in the circle tube was studied by the numerical calculation method. Comparing with the experimental data, it is found that the pressure-based coupled algorithm, SST k-ω turbulence model and hydrogen property model are reasonable and feasible to simulate the flow and heat transfer performance of hydrogen at high temperature and high velocity. The calculated values agree well with the experimental data, and the numerical simulation model is correct. Based on the analysis of flow and temperature field of the base case, the effects of thermal parameters on the flow and heat transfer performance of hydrogen were also studied. The increasing inlet mass flow rate enhances heat transfer performance and the increasing heat flux weakens it. The methods and results can provide some references and guidance for the study of the flow and heat transfer performance of gaseous fluid under high temperature and high heat flux, and thermal design and simulation of nuclear thermal propulsion reactor.