两相回路热虹吸管的三维模拟研究  

Three-dimensional Numerical Simulation Study on Two-phase Loop Thermosyphon

作　　者：杨文龙 花宇 屈健[2] YANG Wenlong;HUA Yu;QU Jian(School of Energy and Environment,Southeast University,Nanjing 210096,Jiangsu Province,China;School of Energy and Power Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu Province,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096 [2]江苏大学能源与动力工程学院,江苏镇江212013

出　　处：《动力工程学报》2025年第2期171-181,共11页Journal of Chinese Society of Power Engineering

基　　金：国家自然科学基金资助项目(52276067)。

摘　　要：提出并设计了一种带盘管式冷凝器和储液罐的回路热虹吸管,研究了3种充液率下回路热虹吸管的启动和内部流动传热特性。由于回路热虹吸管内沸腾和冷凝过程之间具有强耦合关系,对描述相变的传统Lee模型进行了改进,并引入了饱和温度与局部压力之间的关系,以准确模拟回路热虹吸管内的气液相变和流动传热过程。结果表明:该模型对回路热虹吸管内传热传质过程的预测效果良好;当回路热虹吸管在80%充液率的准稳态工况下运行时,完整的流动循环整体可分为液体过冲、液体回落和大气泡推动液体上升3个阶段,并且随着加热功率的增大,振荡更加明显;回路热虹吸管在仅依靠工质的流动循环和相变传热时,等效导热系数可超过15000 W/(m·K);在较高热流下,80%充液率的回路热虹吸管形成了速度较快且持续稳定的流动循环,表现出较好的传热性能。A loop thermosiphon with coil condenser and liquid storage tank was proposed and designed,and the start-up and internal flow heat transfer characteristics of the loop thermosiphon were studied under three liquid filling rates.Due to the strong coupling relationship between boiling and condensation processes in the loop thermosiphon,the traditional Lee model for describing phase transitions was improved,and the relationship between saturation temperature and local pressure was introduced to accurately simulate the gas-liquid phase transition and flow heat transfer process in the loop thermosiphon.Results show that the model has a good predictive effect on the heat and mass transfer processes inside the loop thermosiphon.When the loop thermosiphon operates in a quasi steady state with filling rate of 80%,the complete flow cycle can be divided into liquid overshoot,liquid drawdown,and large bubbles pushing the liquid up.As the heating power increases,the oscillation becomes more pronounced.When relying solely on the flow circulation and phase change heat transfer of the working fluid,the equivalent thermal conductivity of the loop thermosiphon can exceed 15000 W/(m·K).At higher heat flux,the loop thermosiphon with 80%liquid filling rate forms a fast and continuously stable flow cycle,exhibiting good heat transfer performance.

关 键 词：两相回路热虹吸管 盘管式冷凝器 Lee模型 气液相变 振荡 

分 类 号：TK124[动力工程及工程热物理—工程热物理]