超声速旋流天然气分离器的旋流特性数值模拟

与传统的低温分离工艺相比，超声速旋流天然气分离器是天然气处理工艺技术的一大创新。在超声速旋流天然气分离器中，气流经过拉伐尔喷管绝热膨胀形成带液滴的超声速低温混合气流，在超声速翼的作用下混合气流由轴流转换成旋流，实现超声速旋流分离。超声速翼是实现气液分离的关键部件。设计了三角薄板型超声速翼，并利用CFD软件对超声速翼段内气流温度、压力、马赫数等特性参数的变化规律和翼段沿主流方向切向速度的变化情况进行了分析。结果表明，在所设计的超声速翼段内，气流能始终保持超声速，翼段出口马赫数为1．4，翼前无激波产生；分离器的旋流加速度最高在572000g，可实现良好的超声速气液旋流分离。

Numerical simulation of swirling flow characteristics of supersonic swirling natural gas separator

Supemonie swirling natural gas separator is a revolutionary gas conditioning technology compared with traditional low-temperature separation. In supersonic swirling separator, while the gas stream passing through Laval nozzle, the gas stream forms supersonic low-temperature stream with small liquid droplets because of adiabatic expansion effect of nozzle. The gas mixture enters the wing section and turns into swirling flow from axial flow by the action of supersonic wing, and then gas and condensed liquid drops are separated in the drainage section. The supersonic wing is a key component of supersonic swirling separator. Deltaic plate supersonic wing was designed. By using CFD software, the supersonic swirling flow field was studied, and the distributions of the temperature, pressure, Mach number in the wing section and tangential velocity along longitudinal section were analyzed. Supersonic swirling characteristics of gas in the wing section were determined. The results show that the gas in the supersonic wing section can always maintain supersonic velocity. The Mach number in the wing section outlet is 1.4 and there is no shock wave before the wing section. The maximum swirling accleration is 572000 g. The gasliquid separation of supersonic gas can be realized well.