The multi-cycle dynamics of the cavitation bubble near the solid wall with an air-entrapping hole or a hemispherical air bubble: A numerical study

Jianyong Yin, Yongxue Zhang, Mingkai Ma, Lei Tian, Xianrong Du
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Abstract

Investigating the interaction between the near-wall cavitation bubble and the air bubble has great significance for understanding the mechanism of air entrainment to alleviate cavitation in actual hydraulic engineering. To quantify the effect of the air bubble on the multi-cycle dynamics of the near-wall cavitation bubble, a more comprehensive compressible three-phase model considering the phase-change process was developed based on OpenFOAM, and corresponding validation was performed by comparing the simulated bubble shape with the published experimental values. The key features of the multi-cyclical evolution of the cavitation bubble are nicely reproduced based on the current numerical model. For the cavitation bubble near the solid wall containing a hemispherical air bubble, the simulated results reveal that the air bubble can reflect the shock wave and thus prevent it from impacting directly on the solid wall, which will help to uncover the microscopic mechanism of aeration avoiding cavitation damage. The dynamical features of the cavitation bubble at different dimensionless distances (γ1) and dimensionless sizes (ε) are investigated and analyzed. For the near-wall cavitation bubble with an air-entrapping hole, the air hole plays a crucial role in the multi-cycle dynamics of the cavitation bubble, leading to the bubble that is always far away from both the air hole and the solid wall. Thus, the current results may provide a potential application for preventing the wall damage caused by the impact of the liquid jet.
固体壁附近空化气泡的多周期动力学,带空气夹层孔或半球形气泡:数值研究
研究近壁空化气泡与气泡之间的相互作用对于理解实际水利工程中空气夹带缓解空化的机理具有重要意义。为了量化气泡对近壁空化气泡多周期动力学的影响,基于 OpenFOAM 建立了考虑相变过程的更全面的可压缩三相模型,并通过比较模拟气泡形状和已公布的实验值进行了相应的验证。基于当前的数值模型,空化气泡多周期演化的主要特征得到了很好的再现。对于固体壁附近含有半球形气泡的空化泡,模拟结果表明气泡可以反射冲击波,从而防止冲击波直接冲击固体壁,这将有助于揭示曝气避免空化破坏的微观机制。研究分析了空化气泡在不同无量纲距离(γ1)和无量纲尺寸(ε)下的动力学特征。对于带有气孔的近壁空化气泡,气孔在空化气泡的多周期动力学中起着关键作用,导致气泡总是远离气孔和固体壁。因此,目前的研究结果为防止液体射流冲击造成的壁面损坏提供了潜在的应用前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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