This paper aims to clarify the cavitation suppression mechanism of the gap structure impeller based on the analysis of cavitation characteristics in a low specific speed centrifugal pump. In order to obtain reliable and consistent numerical results, some numerical considerations and modeling methodology were demonstrated and researched, and a check of the time and space resolution were also conducted. Hence the predicted cavitation performance of the two centrifugal pumps were investigated and compared with experimental results, and they were in qualitative agreement. It was confirmed that the new gap structure impeller has a very good characteristic of inhibiting cavitation, especially in large flow area, the present numerical method can effectively capture the major internal flow features in the centrifugal pump, through the comparison of the two type impeller flow fields, the cavitation suppression mechanism of the gap impeller may be the combination effects of the small vice blade’s guiding flow and gap tunnel’s auto-balancing of pressure.

中文翻译：

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带间隙排水叶片的低比转速离心泵的空化抑制

本文旨在通过分析低比转速离心泵的气蚀特性，阐明间隙结构叶轮的气蚀抑制机理。为了获得可靠且一致的数值结果，对一些数值考虑因素和建模方法进行了论证和研究，并对时空分辨率进行了检查。因此，研究了两个离心泵的预测空化性能，并将其与实验结果进行了比较，并且在质量上是一致的。证实了新型间隙结构叶轮具有很好的抑制气蚀的特性，特别是在大流量区域，该数值方法可以有效地捕捉离心泵的主要内部流动特征，