The thesis were investigated the characteristics of gas-liquid mixed for polymerization system in a stirred tank with triple impellers by experimental research and numerical simulation. Polyether polyol(PPG)was chosen in this study as a research medium. The effects of temperatures, rotary speeds, gas flow rates and different combination of triple impellers on the characteristic of gas-phase flow, stirring power and gas holdup were investigated in the air-PPG system. The results supplied a theoretical basis ...