超音速低温旋流分离器拉瓦尔喷管流场数值分析

The numerical analysis on laval-nozzle flow field of the supersonic low-temperature swirling separator

目的通过对超音速低温旋流分离器的核心部件-拉瓦尔喷管内部流场的数值分析,达到奠定提高气液分离器工作效率的理论研究基础的目的。方法通过对流场的理论数值分析,并借助于CFD软件,找到了喷管流场内各物理参数的变化规律。结果发现拉瓦尔喷管各段尺寸的相对数值大小对流场的变化影响很大,包括临界截面的确定、简化气体的流动模型及能量损耗。结论由此得到,当拉瓦尔喷管的喉部气体流速度达到或超过音速时,即气液分离段的速度达到两个或两个以上马赫数是形成低温气液分离流场的关键。

Aim By analyzing the flow field of the Laval-nozzle, a core component of the supersonic low-temperature swirling gas-water separator, for improving the efficiency of gas-water separation, its theoretic research foundation is established. Methods Based on the principle of flow field numerical analysis and with aid of softer ware CFD, a number of physical factors influencing the fluid movement have been found. Results It is significant to in- fluence the flow field by changing relative sizes of its each segment, including the determination of the critical sec- tion, simplification of the model of the gas flow and energy loss. Conclusion The conclusion is that the key to realize the low-temperature flow field of gas-water separation is the flow speed through the throat of the Laval-nozzle of gas-water separator must be twice as a Mach number or more.