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采用通用有限比率模型对一种新型烟气冲击浸于水的伞型结构气化器燃烧室的流场与温度场进行了数值模拟,分析了循环烟气量对燃烧室喷嘴出口烟气速度和温度的影响;采用VOF两相流模型对烟气与水滴气液两相流动的传热进行了数值模拟,分析了喷嘴高度和液面高度对烟气冲击浸于水的伞型结构的两相流动传热的影响.结果表明:当循环烟气量为燃烧产生烟气量的50%、液面高度为75mm时,冲击效果最佳,水滴被烟气充分卷起并充满气化器,气化传热得到强化.
A general finite model was used to simulate the flow field and the temperature field of a novel gas-fired umbrella-type gasifier combustor. The effects of circulating flue gas on the outlet velocity of combustor nozzle and The VOF two-phase flow model was used to simulate the heat transfer of gas-liquid two-phase flow in flue gas and water droplets. The effects of nozzle height and liquid height on the two-phase Flow heat transfer.The results show that when the circulating flue gas is 50% of the flue gas generated by combustion and the height of the liquid surface is 75mm, the impact effect is best, the water droplets are fully rolled up by flue gas and filled with gasifier, gas Heat transfer has been strengthened.