摘要
利用计算流体力学(CFD)方法对有挡板条件下的桨式和穿流式搅拌器槽内流场进行了三维数值模拟。在模拟的条件下,穿流式搅拌器提高了搅拌槽内的剪切速率,能够增强槽内流体的湍动,同时也加强了搅拌槽底部的流体流动。实验和模拟都发现在雷诺数较低时,两者的功率准数相当,随着雷诺数的增加有孔平桨的功率准数下降。并且发现单层四叶有孔平桨和双层二叶有孔平桨的功率准数模拟相对误差小于单层二叶有孔平桨的模拟误差。总体来说模拟值与实验值吻合还是较好,所以CFD方法的能够用于穿流式搅拌器的优化设计。
A 3D numerical simulation for flow field of paddle-type and punched type impeller with baffle in stirred tank is carried out by computational fluid dynamics（CFD）method.Under the simulation conditions,punched impeller can increase fluid＇s shear rate,which enhance the fluid＇s turbulence,and improve the fluid flow at tank bottom.Both measured and simulated results show that the power dimensionless number is both equal in low Re flow regime,but the power dimensionless number of flat paddle impeller shall decrease as Re increases.In addition the simulation deviations for four blades punched flat paddle impeller and two stages two blades flat paddle are lower than that of two blades flat paddle.As a whole the simulated values are agreement with measured values,so that CFD method can use for optimization of punched impeller.
出处
《机械设计与制造》
北大核心
2012年第4期239-241,共3页
Machinery Design & Manufacture
