旋叶汽水分离器试验和数值模拟研究

针对旋叶汽水分离器的缩比模型展开空气-水冷态试验性能分析和数值模拟研究。试验表明：分离效率主要受水流量的影响，随水流量的增大呈逐渐上升的趋势，当水流量增大到0.3 m³/h后增加趋势逐渐减缓进而出现下降的趋势。压降对空气流量变化敏感，随空气流量的增大显著上升。进一步建立旋叶分离器CFD数值分析模型，采用欧拉两流体模型，气相为连续相，液相为离散相，并使用雷诺应力RSM方法求解湍流应力。计算分析了液滴粒径对分离特性的影响，结果表明，液滴粒径分布对分离效率有显著影响，微小粒径液滴的存在显著降低了气液分离效率。

Experimental and Numerical Study on Swirl-vane Steam Separator

The small scale swirl-vane steam separator was built and studied by experimental and numerical methods using air-water modeling fluid. The experimental results show that the separation efficiency is mainly influenced by water flow rate. It increases gradually with water flow rate. The increase tendency declines when the water flow rate is larger than 0.3 m³/h, and furthermore it decreases. The pressure drop is sensitive to air flow rate and increases markedly with air flow rate. The numerical analysis model was established for swirl-vane steam separator using Euler two-fluid model. The gas was defined as continuous fluid while water was defined as dispersed fluid, and Reynolds stress model (RSM) was used to solve the turbulent stress. The impact of droplet size on the separation characteristics was analyzed in this simulation. The simulation results show that the droplet size distribution has a marked influence on the separation efficiency, and the existences of the micro water particles cause the marked reduction of the separation efficiency of swirl-vane steam separator.