基于CFD数值模拟和热模实验的敞开式跑道池的优化研究

发布时间：2018-02-15 14:49

本文关键词： 计算流体力学能源微藻混合特性参数结构优化新型跑道池　出处：《华东理工大学》2015年硕士论文　论文类型：学位论文

【摘要】：跑道池光生物反应器是微藻大规模培养最常用的装置。本文利用计算流体力学(CFD)技术对能源微藻跑道池光生物反应器进行了系统研究,分析了在不同跑道池内的流体混合特性参数如光照方向速度、死区比例和平均速度等。首先,用CFD对跑道池的蹼轮和跑道池添加内构件进行了研究：(1)对10米规模的中型池的蹼轮不同叶片数量进行优化,模拟结果显示当蹼轮叶片数量为6时,跑道池的光照方向速度会高于蹼轮叶片数为4和8的情况；(2)研究4.5米规模跑道池蹼轮叶片的倾斜角度的大小对混合的影响,发现当蹼轮桨叶两两之间发生交错式倾斜时,跑道池内流体的光照方向速度增加、功率下降,而当倾斜角度为15度时,效果达到最佳；(3)为了提高跑道池中流体在光照方向的速度,在2.25米跑道池内添加扰流柱进行研究。CFD模拟计算结果表明该结构能够明显地提高跑道池中流体光照方向速度。当跑道池内添加5个对角线长30毫米的菱形扰流柱时,将会产生最好的混合效果。其次,对不同规模的跑道池进行放大研究,发现跑道池随着规模的增大,4.5米规模和25米规模的跑道池在光照方向速度上分别比2.25米跑道池降低了41.0%和62.2%。在三种不同规模跑道池中同时进行微藻培养,亦得到了规模变大产率降低的结果。最后,应用CFD技术设计开发了一种新型的跑道池,即气升式跑道池。模拟结果显示,带弯道的气升式跑道池的光照方向速度要高于2.25米规模相同表面积的常规跑道池,这一结果在微藻热模培养中得到了验证。
[Abstract]:Runway pond photobioreactor is the most commonly used device for large-scale microalgae culture. In this paper, the energy microalgae runway photobioreactor was systematically studied by using computational fluid dynamics (CFD) technique. The characteristics of fluid mixing in different runway ponds, such as illumination direction velocity, dead zone ratio and average velocity, are analyzed. Using CFD to study the webbed wheel of the runway pool and the added inner components of the runway pool. (1) optimizing the number of the webbed wheels of a medium scale pond of 10 meters. The simulation results show that when the number of webbed wheels is 6:00, the number of webbed wheels is 6:00. The speed of illumination direction of the runway pool is higher than that of the number of webbed wheel blades of 4 and 8.) the influence of the angle of the fin wheel blade on the mixing is studied. It is found that when the interlaced tilting occurs between the webbed wheel blades, In order to improve the velocity of the fluid in the runway pool in the direction of illumination, the velocity of the fluid in the pool increases and the power decreases, but when the angle of inclination is 15 degrees, the effect reaches the optimum value (3) in order to increase the velocity of the fluid in the runway pool in the direction of illumination, The CFD simulation results show that the flow direction velocity of the fluid in the runway pool can be improved obviously by adding scrambling column into the 2.25m runway pool. When five diamond-shaped spoiler columns with 30 mm diagonal length are added to the runway pool, the flow direction velocity of the fluid in the runway pool can be improved obviously. Will produce the best mixing effect. Second, the study of different sizes of runway pool amplification, It was found that with the increase of scale, the speed of illumination direction of the runway ponds of 4.5m and 25m decreased by 41.0% and 62.2, respectively. The microalgae culture was carried out simultaneously in the three different sizes of runway ponds. Finally, a new type of runway pool, that is, airlift runway pool, is designed and developed by using CFD technology. The simulation results show that, The illumination direction velocity of the airlift runway pool with bends is higher than that of the conventional runway cell with the same surface area of 2.25m. This result has been verified in microalgae thermo-model culture.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ052

【参考文献】