Numerical Investigation of an Open-Design Vortex Pump with Different Blade Wrap Angles of Impeller

Numerical Investigation of an Open-Design Vortex Pump with Different Blade Wrap Angles of Impeller
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不同叶轮叶片包角开式涡流泵的数值研究

DOI:
10.3390/pr8121601
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发表时间:
2020-12
期刊:
影响因子:
3.5
通讯作者:
Hao Chang
Hao Chang
中科院分区:
工程技术3区
文献类型:
--
作者:
Xiongfa Gao;Ting Zhao;Weidong Shi;Desheng Zhang;Ya Shi;Ling Zhou;Hao Chang

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在开式涡泵水力设计中,叶轮叶片包角是一个重要的结构参数。本文以圆柱叶片结构的旋涡泵为研究对象,设计了两种不同叶片包角的旋涡泵叶轮。进行了实验和数值模拟研究,得到了不同流量下的外部特性和内部流场的结果。结果表明:在保证其他主要结构参数不变的情况下,开式旋涡泵的效率和扬程随着叶片包角的减小而增大;叶片包角增大时,从侧腔回流到进口的旋转回流长度变长。对于同一类型的旋涡泵,旋转回流到进口的长度随着流量的增加而减小。在叶轮前端面的进口区域,存在一个液体回流到侧腔的区域。蜗壳截面显示,液体经过叶轮和侧腔后,以较强的螺旋强度排至泵出口。结果表明,叶片包角减小,轴功率增大,泵效率提高。旋涡泵叶轮叶片包角可考虑选择较小的值。
The blade wrap angle of impeller is an important structural parameter in the hydraulic design of open-design vortex pump. In this paper, taking a vortex pump with a cylindrical blade structure as the research object, two kinds of different blade wrap angle of vortex pump impellers are designed. The experiment and numerical simulation research is carried out, and the results of external characteristics and internal flow field are obtained under different flow rate. The results show that when ensuring that other main structural parameters remain unchanged, the efficiency and head of open-design vortex pump increase with the blade wrap angle decreases. In the case of blade wrap angle increasing, the length of rotating reflux back from lateral cavity to inlet is longer. For the same type of vortex pump, the length of rotating reflux to inlet decreases with the increase of flow rate. At the inlet area of impeller front face, there is an area where liquid flows back to the lateral cavity. The volute section shows that after passing through the impeller and lateral cavity, the liquid is discharged to the pump outlet with strong spiral strength. It is found that the blade wrap angle decreases and the shaft power increases, while the pump efficiency increases. The impeller blade wrap angle of vortex pump can be considered to select a smaller value.
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