Mingzhe Zhou , Ziyang Wang , Huaiyu Cheng , Bin Ji , Yantao Cao
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引用次数: 0
Abstract
Cavitation erosion is a long-standing issue, which plays a pivotal role in the material damage of much hydraulic machinery. However, despite abundant numerical research on cavitation erosion assessment, bubble dynamics has been commonly overlooked. Consequently, we develop an improved cavitation erosion model based on energy conversion and assess an ALE15 hydrofoil surface by its incorporation into a multiscale approach. Our erosion model stands out in considering the bubble behaviors throughout its entire lifespan to eliminate the influence of bubble oscillation on cavitation erosion. Using the bubble information in the well reproduced cavitating flow, we evaluate both the cumulative and instantaneous cavitation erosion, and the results show satisfactory agreement with the experimental pattern. Our findings demonstrate that frequent vapor-liquid alternations, induced by the collaborative effects of upstream pressure gradients and main flow, increase the potential for erosion risk at the hydrofoil leading edge. Downstream erosion primarily results from secondary shedding and the collapse of U-shaped cavities’ legs. By contrast, the acoustic energy emitted by the shedding cavities traveling farther and upwards away from the hydrofoil leads to negligible erosion on the surface.
气蚀是一个由来已久的问题,在许多液压机械的材料损坏中起着举足轻重的作用。然而,尽管有关气蚀评估的数值研究非常丰富,但气泡动力学却普遍被忽视。因此,我们开发了一种基于能量转换的改进型气蚀模型,并将其纳入多尺度方法,对 ALE15 水翼表面进行评估。我们的侵蚀模型突出地考虑了气泡在整个生命周期中的行为,消除了气泡振荡对空化侵蚀的影响。我们利用气泡在重现性良好的空化流中的信息,评估了累积空化侵蚀和瞬时空化侵蚀,结果显示与实验模式的一致性令人满意。我们的研究结果表明,在上游压力梯度和主流的共同作用下,频繁的汽液交替增加了水翼前缘潜在的侵蚀风险。下游侵蚀主要源于二次脱落和 U 形空腔支脚的坍塌。相比之下,脱落的空腔所发出的声能在远离水翼后向上传播,对表面的侵蚀可以忽略不计。
期刊介绍:
The International Journal of Multiphase Flow publishes analytical, numerical and experimental articles of lasting interest. The scope of the journal includes all aspects of mass, momentum and energy exchange phenomena among different phases such as occur in disperse flows, gas–liquid and liquid–liquid flows, flows in porous media, boiling, granular flows and others.
The journal publishes full papers, brief communications and conference announcements.