侧入式搅拌槽中桨叶参数对流场及功率影响的数值模拟

运用计算流体力学(CFD)技术对不同桨叶参数的侧入式搅拌槽内流场进行了数值模拟。模拟结果表明：搅拌槽内流场产生分层现象，下层流场为内部围绕搅拌槽中心的环形上升流和外部沿搅拌槽壁面的低速下降流组成的高速循环流，上层流场为与下层流场方向相反的低速循环流；在相同搅拌功率输入下，增大桨叶直径能够增加搅拌槽底部流体的动能，但会抑制搅拌槽上部流体的动能；叶片倾角为45°时桨叶的轴流性能最好，叶片个数为4时桨叶的搅拌效率最高。

Numerical simulation of the influence of the agitator parameter on the field characteristics and the power in a side-entering stirred reactor

The flow fields of a side-entering type stirred tank have been simulated numerically for different agitator parameters using computational fluid dynamics(CFD).The simulation results showed that the flow field in the stirred tank resulted in stratification.The bottom of the tank exhibited a high-speed cycle flow resulting from the ring upwelling flow around the center of the stirred tank and the low-speed drop flow from the wall surface of the stirred tank.The top of the flow showed a low-speed cycle flow in the opposite direction to the bottom of the flow.For the same input power of stirring,the kinetic energy of the bottom of the flow increased with increasing diameter of the agitator,but that of the top of the flow decreased.The axial flow of the agitator showed the best performance when the angle of the blade was 45° and an agitator with four leaves showed the highest efficiency.