摘要
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
The capillary pumped loop (CPL) is a highly efficient heat transfer device with numerous potancial applications in the aerospace industry. However, temperature and pressure oscillations in the CPL seriously restrict its application. This paper presents a mathematical model to describe the working instability of the CPL system. The model consists of 12 equations including two groups of onedimensional unsteady mass, energy, and momentum equations for the vapor and liquid flow in the CPL evaporator. The computational results for both steady and unsteady state conditions agree well with experimental data. The results were used to analyze the instability problems. The model can successfully simulate the steady and unsteady working conditions and the critical oscillation phenomena in the CPL test loop. The variations of the system temperature, pressure, enthalpy, heat flux, vapor mass velocity, liquid mass velocity, evaporation rate, capillary radius, etc., were successfully predicted. The influences of the different variables on the CPL system performance were analyzed based on the theoretical results and the measures to improve the CPL stability were proposed.
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2001年第10期97-100,共4页
Journal of Tsinghua University(Science and Technology)
基金
国家"八六三"高技术航天领域项目 ( 86 3-2 -4 -3-1-1)
