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为了解空化性能对微型泵运行可靠性的影响,对两个半开式离心叶轮进行了空化实验。两试验叶轮在断面上具有相同的叶片型线,其中一个为二维叶片,另一个为倾斜叶片。为了与实验对比,在每个叶轮最佳效率点附近,基于标准k-ε模型和VOF空化模型进行微型泵内三维紊流计算。研究揭示了所试验的微型泵具有与常规尺寸离心泵相当的空化性能;随着叶尖轴向间隙增大,微型泵的空化性能下降;对半开式叶轮,采用倾斜叶片,既可提高微型泵的水力性能,还能提高其空化性能。研究显示叶轮进口流动均匀是空化性能得到改善的重要原因。
In order to understand the effect of cavitation performance on the operational reliability of micro-pumps, two half-open centrifugal impellers were subjected to cavitation experiments. The two test impellers have the same blade profile on the cross section, one of which is a two-dimensional blade and the other is a bevelled blade. For comparison with the experiment, three-dimensional turbulent flow in a miniature pump was calculated based on a standard k-ε model and a VOF cavitation model near the optimum efficiency point for each impeller. The study revealed that the micropumps tested have cavitation performance comparable to that of conventional size centrifugal pumps; the cavitation performance of the micropumps decreases as the tip clearance increases; and the use of angled vanes for semi-open impellers Improve the hydraulic performance of the micro-pump, but also improve its cavitation performance. Research shows that even the impeller inlet flow is an important reason for the improvement of cavitation performance.