Abstract: In mechanical vapor recompression system,gas-liquid separation is needed before the steam produced in evaporator sucked into the compressor. In consideration of compactness and segregational stability,gas-liquid cylindrical cyclone(GLCC)is applied for this operation. Structure parameter design and Fluent numerical calculation show that,separation effect is significantly influenced by the size of overflow pipe and underflow pipe. Gas volume fraction and liquid volume fraction could be 1 with overflow pipe diameter of 50mm and underflow pipe diameter of 40mm. Proved the moving laws of the outer vortex and inner vortex existed in GLCC,which rotate in the same direction and move in the opposite direction. Compared to one single inlet,separation process could be more steady by the application of double inlets,appropriately increasing cyclone diameter could decrease the pressure drop and shorten the distance between pure gas phase zone and pure liquid phase zone,improve the separation performance.

Key words: column, centrifugation, numerical simulation, gas-liquid flow

摘要： 机械式蒸汽再压缩技术中，蒸发器产生的蒸汽进入压缩机前需要进行气液分离，考虑到结构紧凑性与分离稳定性，本文提出采用管柱式气液旋流分离器进行此操作，对其进行了结构参数设计和Fluent数值计算。经过研究：发现溢流管和底流管尺寸对分离器性能影响较大，改变二者数值大小，当溢流管直径为50mm、底流管直径为40mm时，溢流管和底流管的气、液相体积分数可分别达到1，且满足文献中对于出口流速的要求；证明了分离器流场内外旋流与内旋流的运动规律，两者旋向相同，运动方向相反；相比较单入口，采用双入口的管柱式气液旋流分离器，内部流场参数分布高度对称，分离过程更加稳定；适当增加旋流器直径，可降低流体通过压降，缩短纯液相区与纯气相区间过渡区域，改善分离器性能。

关键词: 管柱式, 离心分离, 数值模拟, 气液两相流