基于数值模拟的新型轴向导叶性能分析

Performance Analysis of a New Axial Guide Vane Based on Numerical Simulation

由于塑料具有成本低、轻巧、表面光洁等优点已获得广泛的工程应用。但传统扭曲空间导叶由于叶片几何边界复杂,很难通过注塑工艺进行生产,而应采用圆柱叶片。因此,本文通过125QJ20型塑料泵的研发,设计出新型轴向导叶。为分析该导叶的性能,结合自主开发的导叶设计软件DLSJ,根据参数设计出另一径向导叶模型,并将同一叶轮分别与两个导叶进行匹配。再通过Fluent软件,采用标准k-ε模型、SIMPLEC算法对这两组模型分别进行了全流场数值计算,并对导叶内部内流场进行对比分析,结果表明轴向导叶外特性明显优于径向导叶。通过流场分析,该新型轴向导叶能改善导叶内部流动,提高井泵水力性能。同时,新导叶具有注塑简单的特点,可有效降低成本,有着较好的市场前景。

Plastic moldings were widely applied due to the merits of light-weight and low surface roughness. Twisted blade in space guide vane can not be easily casted by plastic injection molding process because of its complex surface boundaries. There-fore, through development of 125QJ20 deep well pump, a new axial guide vane was designed. In order to examine its perform-ance, a radial guide vane was designed which was conducted by the in-house design software DLSJ for guide vanes. Each guide vane was assembled with the same impeller. Then the numerical simulations of internal flow field of the two models were carried out on the platform of FLUENT software. The comparative analysis of the internal flow field of the two guide vanes reveals that the axial guide vane can effectively improve the internal flow and obtain better hydraulic performance. Obviously the molding process of the new guide vane is simple which can effectively reduce the cost of production. Thus this design shows a promising market prospect for deep well pumps.