气体性质对旋风分离器性能影响的数值模拟  

Numerical Simulation of the Effect of Gas Property on the Performance of Cyclone Separator

作　　者：李凯[1] 陈登宇[1] 朱锡锋[1] 

机构地区：[1]中国科学技术大学安徽省生物质洁净能源重点实验室,合肥230026

出　　处：《农业机械学报》2014年第3期179-183,195,共6页Transactions of the Chinese Society for Agricultural Machinery

基　　金：国家高技术研究发展计划（863计划）资助项目（2012AA051803）、“十二五”国家科技支撑计划资助项目（2011BAD22807）和中国科学院重点部署项目资助项目（KGZD-EW-304-3）

摘　　要：利用计算流体动力学（CFD）软件包FLUENT6．3对密度σ=0．6125～2．4500kg／m3、粘度μ=4．4735×10^-6--4．4735×10-5kg／（m·s）的一系列模型气体在旋风分离器中的流动进行模拟，采用单因素分析法分别研究了气体性质对无量纲切向速度、压强的影响。结果表明：无量纲切向速度随着密度增加而增大，随着粘度的增加而减小；无量纲最大切向速度与密度、粘度均呈对数关系；压降阻力系数不仅与旋风分离器几何结构有关，还与气体粘度相关；压降随粘度呈对数降低。同时，拟合得到了无量纲切向速度与密度、粘度的二元方程式，具有较好的普适性。The flow fields in cyclone at various model gases with p = 0. 612 5 -2. 450 0 kg/m3 and/x = 4. 473 5 ×10-6 -4. 473 5 × 10-5 kg/（ m·s） were simulated by the computational fluid dynamics （CFD） software package, FLUENT 6.3. The influences of density and viscosity of gases on the dimensionless tangential velocity and pressure drop were performed respectively by single factor analysis. The result indicated that the dimensionless tangential velocity of gas flow in cyclone increases as the viscosity increase, while decreases with the increase of viscosity. Both density and viscosity have logarithmic function relations with the dimensionless maximum tangential velocity. The drag coefficient is not only influenced by the geometric parameters of the cyclone, but also affected by the viscosity of gases; there is a logarithmic regression between the pressure drop and viscosity of gas. Moreover, a fitting bivariate polynomial equation between the dimensionless tangential velocity and the factors was obtained.

关 键 词：旋风分离器 性能 气体粘度 气体密度 数值模拟 

分 类 号：TK6[动力工程及工程热物理—生物能] TQ051.84[化学工程]