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首页> 外文期刊>Proceedings of the Institution of Mechanical Engineers, Part C. Journal of mechanical engineering science >Experimental and numerical analysis of the unsteady influence of the inlet guide vanes on cavitation performance of an axial pump
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Experimental and numerical analysis of the unsteady influence of the inlet guide vanes on cavitation performance of an axial pump

机译：入口导向叶片对轴向泵空化性能的实验和数值分析

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摘要

The effect of the inlet guide vanes on cavitation performance of an axial pump is investigated to assess the mechanism for cavitation in pumps and improve their cavitation performance. The effect of inlet guide vane angles on cavitation performance was assessed experimentally, and computational fluid dynamics was used to analyze the inner flow field of the axial pump and to probe the cavitation mechanism. The simulation results agree qualitatively with the experimental data, showing that cavitation performance is improved with positive inlet guide vane angles but hampered with negative ones. The cavitation performance itself is controlled by the cavitation volume, which first expands circumferentially when the net positive suction head decreases from a certain large value and then develops toward the axis radially after the net positive suction head reaches a certain value. This is when the cavitation performance deteriorates. Comparing cavitation volume for the critical net positive suction head as determined by two different methods, the method based on efficiency drop (NPSHeff.,1%) is found to be more suitable than that based on head drop (NPSHhead.,3%). Furthermore, the distribution of swirl is shown to be closely related to the distribution of cavitation, a feature that may be used to predict cavitation along the impeller.
机译：研究了入口导向叶片对轴向泵的空化性能的影响，以评估泵中的空化机构，并改善其空化性能。实验评估入口导向叶片角度对空化性能的影响，并且使用计算流体动力学来分析轴向泵的内部流动场并探测空化机构。仿真结果与实验数据定性同意，表明空化性能随着正入口导向叶片角度而变化，但妨碍了负面的叶片角度。空化性能本身由空化体积控制，该空化体积是当净正抽吸头从一定大值减小时圆周膨胀，然后在净正抽头达到一定值之后径向径向发展。这是空化性能恶化的时候。通过两种不同方法测定的临界净正抽吸头的空化体积，基于效率下降的方法（NPSheff。，1％）比基于头部下降（NPShhead，3％）更适合。此外，示出了旋流的分布与空化的分布密切相关，该特征可用于预测叶轮的空化。

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