【作者】 肖海涛； 祁海鹰； 由长福； 徐旭常；

【Author】 Haitao Xiao;Haiying Qi;Changfu You;Xuchang Xu;

【机构】 清华大学煤的清洁燃烧技术国家重点实验室；

【摘要】 气固阻力是稠密气固两相流动,尤其是垂直流动中的主要作用力,相应的模型也是数值模拟中准确描述气固两相运动的关键。为了解决现有经验或半经验模型的普适性问题,合理描述流动中经常发生的颗粒团聚现象对气固阻力的严重影响,本文从理论分析入手,将精确的CFD方法与宏观的系统能量分析方法相结合,建立了在欧拉框架下的计及颗粒团聚效应的气固阻力分析模型。与现有模型相比,新模型不仅合理地描述了气固两相相互作用的物理过程,具有相同的函数变化关系,而且避免了以往采用经验系数所导致的误差和局限性。经循环流化床数值模拟的检验证明,新模型的计算结果与实验数据吻合,从而在稠密气固两相流动的数值模拟中具有相当的优越性。更多还原

【Abstract】 Drag force is the key parameter in analysis of gas-solid flow,especially in dense vertical two-phase flow,and is also important in numeric simulation of the gas-solid flow.For describing the cluster phenomena and its effect on the drag force,the paper theoretically analyzes the model of gas-solid drag force in Eulerian simulation under consideration of cluster effects,using the energy minimization concept.Comparing with the present model,new model can reasonably describe the interaction between gas phase and particle phase,and avoid the error bringing by the inaccurate experiential coefficient. In the numerical simulation of a CFB apparatus,the result of the new model is well agree with the experiment data,so it shows the remarkable advantage in dense gas-solid two-phase flow.更多还原