相切套管曝气式光生物反应器设计和流场分析

DESIGN AND FLOW FIELD ANALYSIS OF A NOVEL TANGENT TUBE-IN-TUBE PHOTOBIOREATOR

运用场协同原理分析微藻培养系统,提出一种新型光生物反应器,并利用Fluent进行流场模拟,分析流体径向速度V_r、速度与光照方向协同角α及旋流数Sn的变化特征。结果表明,该反应器截面明显存在纵向涡,V_r最大达0.045 m/s,|cosα|平均为0.7,Sn平均为2.26。初步研究证实,新型相切套管内置曝气式光生物反应器具有较好的流体混合性能,速度场与光分布的协同性,有利于强化传质和加强藻细胞光暗区的高频游动,可在较大程度上提高微藻的高效规模化培养效果。

By using field synergy theory as the instruction for the first time, shows a novel tangent tube-in-tube photobioreactor and we utilized the Fluent to analyze that the curves of radial velocity Vr, synergy angle a between the light gradient and velocity and swirl number Sn. The results show that longitudinal vortex is generated in the cross section, the largest value of radial velocity is 0.045 m/s and the average value of Sn is 2.26. Preliminary study can confirm that the tangent tube-in-tube photobioreactor has a better mixing performance and a better synergy extent between the velocity and light gradient which is beneficial to enhance mass transfer and increase the swimming frequency of algae cells across the light and dark zones and has a huge potential for large-scale cultivation.