分液联箱内有机工质气液分离过程数值模拟及对比研究

为获得不同工质对分液联箱内气液分离过程的影响作用，以相同的进口流量和进口干度作为对比基准开展数值模拟研究。基于VOF （Volume of Fluid）多相流模型，模拟6种工质气液分离过程，物性变量为密度、黏度和表面张力。结果表明，受液气密度比的影响，工质的气液分离状态会发生转变，R134a气液分离性能最好；而根据对工质环保性能的要求，R1234ze （E）对R134a具有良好的可替代性，并给出了其他工质提高气液分离性能的优化方向。

Numerical Simulation and Comparative Study of Liquid-vapor Separation of Organic Working Fluid in Liquid-Separation Headers

In order to obtain the influence of different working fluids on the liquid-vapor separation in the liquid separation header, a numerical simulation was carried out with the same mass flow rate and vapor quality as the comparison benchmark. Based on the VOF(Volume of Fluid) multiphase model, the liquid-vapor separation among six working fluids was simulated. The property variables were density, viscosity and surface tension. The result demonstrated that the liquid-vapor separation state will change under the influence of liquid vapor density ration. In addition, it was found that R134a had the best performance in liquid-vapor separation, while R1234ze(E) could replace R134a well. The optimization direction of other working fluid to improve the performance of liquid-vapor separation was also given.