半圆管挡板搅拌槽内的湍流流场

为增强搅拌槽内流体的流动特性,设计一种半圆管形挡板,采用标准k-ε模型和多重参考系法对其内部湍流流场进行研究。通过与实验结果的比较,验证了所建模型和模拟方法的可靠性,随后对搅拌槽内的流场、速度和湍动能分布及功率消耗进行分析,并与标准搅拌槽进行对比。结果表明,半圆管挡板能提高流体速度分布的均匀程度,增大流体的轴向和切向速度以及湍动能,而且功率消耗略降低约5%,具有一定的节能功效。

Turbulent flow in a stirred tank equipped with half-circle-tube baffles

For the purpose of improving the hydrodynamics in stirred tanks, a half-circle-tube baffle stirred tank was developed and the turbulent flow characteristics in it were studied using the standard k-ε model and the multiple reference frame (MRF) method. The modeling and simulation method were validated by comparisons with the experimental results from the reported literature. Subsequently, the flow fields, velocity and turbulent kinetic energy distributions, and power consumption were analyzed and compared with their counterparts in the standard stirred tank. The results showed that the new configuration developed here has the advantage of enhancing the uniformity of fluid velocity distribution, improving the axial and tangential velocity, as well as the turbulent kinetic energy. Besides, the power consumption can be reduced about 5%, which has the advantage of energy saving.