微重力动态水气分离器性能仿真与理论分析

开展微重力动态水气分离器性能研究，对水气分离技术设计与优化具有重要意义。根据动态水气分离器内部结构和流动形式，建立了基于环状流-库特流假设的理论分析模型，提出了基于界面概率近似方法的欧拉双流体模型描述由流动形态转化造成的混合流多尺度界面，采用多参考系方法处理转动与非转动区域之间的变量交互问题。应用理论分析与仿真两种方法研究动态水气分离器准稳态和瞬态特性的无量纲参数变化规律。结果表明：理论分析与仿真结果具有较强的相互验证关系；准稳态的增压比和能耗特性能提供设计参数选择依据，能效比能确定最佳工作区间；分离阶段瞬态特性与入口流动参数无关，输运阶段瞬态特性与入口流动参数、液路出口阻尼相关；以输运压力作为液路出口电磁阀关闭充分条件可实现液分离效率不受入口流动参数影响。

Performance simulation and theoretical analysis of microgravity dynamic gas-liquid separator

The research on the performance of microgravity dynamic gas-liquid separation is of great significance for the design and optimization of gas-liquid separation technology. A theoretical model based on the annular flow and couette flow assumptions is established according to internal structure and flow patterns of dynamic gas-liquid separator. Eulerian two-fluid model with an interface probability approximation method is proposed to describe multi-scale gas-liquid interfaces in the mixed flow caused by the flow pattern transformation, and the multiple references approach is used to deal with the issue of variables interaction between rotating and non-rotating regions. Both theoretical analysis and simulation are applied to studying the quasi-steady state and transient characteristics with dimensionless parameters of dynamic gas-liquid separator. The results show that the results from simulation model and theoretical model have a strong mutual authentication relationship; quasi-steady state pressure ratio and power consumption characteristics provide a basis for parameters design, and energy efficiency ratio determines the optimum operating range; transient characteristics during the separation stage are independent of inlet flow parameters; however, they are dependent of inlet flow parameters and the damping of liquid outlet during transport stage; once the transport pressure is chosen as a sufficient condition, liquid separation efficiency cannot be affected by inlet flow parameters.