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毛细抽吸两相流体回路 (CPL)是一种在航天领域具有广阔应用前景的高效相变换热装置 ,然而 CPL 系统内存在的温度压力波动现象严重地制约了其应用。为此建立了一个描述 CPL 系统工作不稳定性的数理模型 ,模型由 12个方程组成 ,包括分别针对蒸发器中蒸汽和液芯中液体的两组非稳态的质量、能量、动量守恒方程及其它补充方程。模型的模拟和分析表明 ,模型能够模拟系统的稳态、非稳态运行工况、临界振荡现象等。得出了系统温度、压力、焓值、热流密度、蒸汽质量流速、液体质量流速、蒸发质量流速、毛细半径等参数随时间变化的动态曲线 ,理论计算结果与实验结果基本吻合。根据理论计算结果分析了各种参数对系统性能的不同影响 ,并提出了改善 CPL系统稳定性的建议
Capillary pumping two-phase fluid circuit (CPL) is an efficient phase-change heat transfer device with broad application prospects in aerospace field. However, the temperature fluctuation in CPL system severely restricts its application. For this purpose, a mathematical model describing the instability of the CPL system was established. The model consisted of 12 equations, including two groups of unsteady mass, energy and momentum conservation equations respectively for the liquid in the vapor and liquid in the evaporator and Other supplementary equations. The simulation and analysis of the model show that the model can simulate the steady-state and unsteady operating conditions of the system and the phenomena of critical oscillation. The dynamic curves of parameters such as temperature, pressure, enthalpy, heat flux, steam mass flow rate, liquid mass flow rate, evaporation mass flow rate and capillary radius with time are obtained. The theoretical calculation results are in good agreement with the experimental results. According to the theoretical calculation results, the different influences of various parameters on system performance are analyzed, and some suggestions to improve the stability of CPL system