In order to suppress the cavitation of an airfoil under random operating conditions, a deformable covering was constructed in the cavitation prone area of the NACA0012 airfoil. By sensing the pressure difference between the inner and outer sides of the airfoil, the covering of the airfoil can be changed adaptively to meet the requirement of suppressing random cavitation of the airfoil. The simulation results show that the cavitation influence range of the airfoil with a shape memory alloy covering can be reduced by more than 70%, and the cavitation is well reduced and suppressed. Moreover, the backflow near the wall of the airfoil was reduced under random working conditions. When the maximum bulge deformation of the covering was between 3–6 mm, the airfoil produced a cavitation range only on the covering surface of the airfoil, and there was no cavitation erosion on other parts. This method with locally variable airfoil to suppress cavitation provides a good reference value for other hydraulic machinery to suppress cavitation.

中文翻译：

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基于可变NACA翼型的随机空化抑制数值模拟

为了在随机操作条件下抑制翼型的空化，在 NACA0012 翼型的空化易发区域构建了可变形覆盖物。通过感知翼型内外压差，可以自适应改变翼型的覆盖层，满足抑制翼型随机空化的要求。仿真结果表明，具有形状记忆合金覆盖层的翼型的空化影响范围可降低70%以上，空化得到很好的减少和抑制。此外，在随机工作条件下减少了翼型壁附近的回流。当覆盖物的最大膨胀变形在3-6mm之间时，翼型仅在翼型的覆盖面上产生空化范围，其他部位无气蚀现象。这种局部变翼抑制空化的方法为其他液压机械抑制空化提供了很好的参考价值。