单层搅拌桨的流动与混合性能研究
发布时间：2018-09-09 12:36
【摘要】：论文对搅拌槽内自主设计的三叶翼型桨(3H)和三凹叶翼型桨(3CH)以及三种直径的四叶45°斜叶桨(PBT)进行了流场结构分析、功率数测定、循环效率测定以及混合时间测定。通过对五个桨叶的分析发现翼型桨的功率数比斜叶桨低得多,但其循环效率比斜叶桨高很多。斜叶桨桨叶直径越大功率数越低,上提比下压操作功率数大。3H桨叶和3CH桨叶都在较低的功率消耗提供很高的轴向主体流动速度,并且其流型比较简单。相同转速条件下斜叶桨湍动更剧烈,线涡、漩涡、二次流等流场结构随桨叶直径增大而增强。3H与3CH桨的混合时间对输入功率很敏感,增加输入功率可以使3H和3CH桨叶的混合时间迅速缩短。当使用斜叶桨进行混合搅拌时,小直径斜叶桨达到相同的混合效果所消耗的功率更低,但受到槽内流场结构的影响也会有所变化。
[Abstract]:In this paper, the flow field structure, power number, cycle efficiency and mixing time of three blade airfoil propeller (3H) and three concave blade wing propeller (3CH) and three kinds of four-blade 45 掳inclined blade propeller with four diameters are analyzed. Through the analysis of the five blades, it is found that the power number of the wing propeller is much lower than that of the oblique blade propeller, but its cycle efficiency is much higher than that of the inclined blade propeller. The higher the blade diameter is, the lower the blade diameter is, and the higher the operating power number is. 3H blade and 3CH blade provide high axial main flow velocity at lower power consumption, and the flow pattern is relatively simple. At the same speed, the turbulence of the propeller with oblique blades is more intense. The mixing time between the .3H and 3CH propeller is sensitive to the input power, and the structure of the constant flow field increases with the increase of blade diameter, such as the linear vortex, the swirl and the secondary flow. The mixing time of 3H and 3CH blades can be shortened rapidly by increasing the input power. When the inclined blade is mixed and stirred, the power consumed by the small diameter propeller to achieve the same mixing effect is lower, but the influence of the flow field in the slot will also change.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE96
本文编号：2232387
[Abstract]:In this paper, the flow field structure, power number, cycle efficiency and mixing time of three blade airfoil propeller (3H) and three concave blade wing propeller (3CH) and three kinds of four-blade 45 掳inclined blade propeller with four diameters are analyzed. Through the analysis of the five blades, it is found that the power number of the wing propeller is much lower than that of the oblique blade propeller, but its cycle efficiency is much higher than that of the inclined blade propeller. The higher the blade diameter is, the lower the blade diameter is, and the higher the operating power number is. 3H blade and 3CH blade provide high axial main flow velocity at lower power consumption, and the flow pattern is relatively simple. At the same speed, the turbulence of the propeller with oblique blades is more intense. The mixing time between the .3H and 3CH propeller is sensitive to the input power, and the structure of the constant flow field increases with the increase of blade diameter, such as the linear vortex, the swirl and the secondary flow. The mixing time of 3H and 3CH blades can be shortened rapidly by increasing the input power. When the inclined blade is mixed and stirred, the power consumed by the small diameter propeller to achieve the same mixing effect is lower, but the influence of the flow field in the slot will also change.
【学位授予单位】：华东理工大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TE96
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