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叶轮作为离心泵最为关键的部位,其设计参数的优劣直接影响到泵的工作性能。本文重点研究叶轮叶片出口角对泵性能的影响。采用Bezier曲线拟合方法设计叶片型线,介绍了型线为Bezier曲线的叶轮造型设计过程,设计了11组具有不同叶片出口角的叶轮,出口角大小在[20°,30°]区间内;通过数值计算的方法对这11组叶轮进行了性能预测,发现泵的扬程在出口角变化区间内随着出口角的增加而增大,其变化规律与理论扬程变化规律基本吻合;同时,研究了在3种不同流量下,泵的效率与叶轮叶片出口角的关系,发现泵的效率在出口角变化区间内成抛物线分布的变化规律,且当出口角在区间[23°,24°]内,泵的性能最佳。因此,在泵的设计过程中可以通过数值试验的方法,确定最佳的设计参数,这将有助于加快高效泵的研制进程。
As the most important part of the centrifugal pump impeller, the merits of its design parameters directly affect the pump performance. This paper focuses on the impeller blade exit angle of the pump performance. The Bezier curve fitting method was used to design the blade profiles. The design process of the profiled Bezier curves was introduced. Eleven sets of impellers with different blade exit angles were designed and the exit angles were in the range of [20 °, 30 °] The performance prediction of these 11 groups of impellers is carried out by numerical calculation. It is found that the lift of pump increases with the increase of exit angle in the range of exit angle, and its variation is basically consistent with the change of theoretical lift. At the same time, Under three different flow rates, the relation between the pump efficiency and the outlet angle of the impeller blades was found, and the pump efficiency was found to have a parabolic distribution within the range of the outlet angle. When the outlet angle was in the interval [23 °, 24 °] The best pump performance. Therefore, the best design parameters can be determined by numerical tests during the design of the pump, which will help to speed up the development of highly efficient pumps.