关键词: 多管直流式分离器, 气液分离, 抽气, 性能

Abstract: Air exhaust from separator is useful for increasing separation efficiency，but less used in industries. Experimental research and numerical simulation on uniflow type multicyclones were performed with air exhaust from side seam. Air extraction could increase multicyclones efficiency in some low concentration area and higher air extraction flow rate resulted in higher efficiency. But air extraction decreased efficiency when concentration was high，and higher air extraction flow rate led to lower efficiency. Calculation results showed that air exhaust decreased axal velocity in the separation space，increased tangential velocity of free vortex and decreased radial velocity near the wall. All the calculation results could well explain the experimental results. High concentration of water led to more active water film，which reduced separation efficiency.

Key words: uniflow type multicyclones, gas-liquid separation, air exhaust, separation efficiency