Unsteady cavitation causes noise, damage, and performance decline in the marine engineering and fluid machinery systems. Therefore, finding a method to control the cavitation and its destructive effects is important for the industrial applications. In this work, we proposed a passive method to control the unsteady behavior of transient cavitation at the medium Reynolds number. For this aim, we performed an experimental study using a high-speed camera to analyze the effects of hemispherical vortex generators (VGs) on the cavitation dynamics around a hydrofoil surface. In addition, the pressure pulsations induced by the collapse of the cavity structures in the wake region of the hydrofoil were captured with a pressure transducer mounted on the wall downstream of the hydrofoil. The results showed that the instability behaviors of the cavity structures on the hydrofoil were mitigated using the proposed cavitation passive control method. In addition, the pressure pulsations in the wake region of the hydrofoil were reduced significantly. It can be concluded that the suppression of cavitation instabilities can improve the operating life and reliability of the marine and hydraulic systems.

非稳态空化会导致海洋工程和流体机械系统产生噪音、损坏和性能下降。因此，寻找一种控制空化及其破坏作用的方法对于工业应用具有重要意义。在这项工作中，我们提出了一种被动方法来控制中等雷诺数下瞬态空化的不稳定行为。为此，我们使用高速相机进行了一项实验研究，以分析半球形涡流发生器 (VG) 对水翼表面周围空化动力学的影响。此外，由安装在水翼下游壁上的压力传感器捕获由水翼尾流区域空腔结构坍塌引起的压力脉动。结果表明，使用所提出的空化被动控制方法减轻了水翼上空腔结构的不稳定行为。此外，水翼尾流区域的压力脉动显着降低。可以得出结论，抑制气蚀不稳定性可以提高船舶和液压系统的使用寿命和可靠性。