Study on the formation and characteristics of unstable sheet cavitation on hydrofoils

IF 8.7 1区 化学 Q1 ACOUSTICS Ultrasonics Sonochemistry Pub Date : 2024-09-19 DOI:10.1016/j.ultsonch.2024.107074
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Abstract

Hydrofoils, as fundamental components of hydraulic machinery, directly influence the performance of such machinery. This study conducted an analysis of the cavitation characteristics of hydrofoils at a + 4° angle of attack under various cavitation numbers using numerical simulation and experimental research methods. The focus of the research was to explore the phenomenon of unstable sheet cavitation and its causes, as well as to reveal the characteristics of the re-entrant jet. The large eddy simulation method was employed to calculate the cavitation morphology under three different cavitation numbers. The method is highly consistent with the experimental results in simulating the small-scale detachment at the tail of unstable sheet cavitation and the large-scale shedding of cloud cavitation. The study found that the detachment of unstable sheet cavitation is closely related to the re-entrant jet, which exhibits transient and abrupt characteristics during the unstable sheet cavitation phase. Furthermore, by applying FFT processing to the distribution of maximum reverse velocity and the spatiotemporal changes of Ux on characteristic lines, eigenfrequency of the detachment of unstable sheet cavitation were identified. The research results indicate that cavitation mainly show as sheet cavitation when the cavitation closure point does not exceed the zero-slope point. Beyond this point, it transitions to cloud cavitation. This study provides new insights into the cavitation phenomenon of hydrofoils and offers quantitative research on the phenomenon of unstable sheet cavitation.
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水翼上不稳定片状气蚀的形成和特征研究
水翼作为液压机械的基本部件,直接影响着液压机械的性能。本研究采用数值模拟和实验研究方法,分析了水翼在 + 4° 攻角条件下不同空化数下的空化特性。研究的重点是探索不稳定片气蚀现象及其原因,并揭示再入射流的特征。采用大涡模拟方法计算了三种不同空化数下的空化形态。该方法在模拟不稳定片空化尾部的小尺度脱离和云空化的大尺度脱落方面与实验结果高度一致。研究发现,不稳定片空化的脱落与再入射流密切相关,后者在不稳定片空化阶段表现出瞬态和突变的特征。此外,通过对最大反向速度的分布和 Ux 在特征线上的时空变化进行 FFT 处理,确定了不稳定片空化脱离的特征频率。研究结果表明,当空化闭合点不超过零斜点时,空化主要表现为片状空化。超过这个点,就会过渡到云空化。这项研究为水翼的空化现象提供了新的见解,并对不稳定片状空化现象进行了定量研究。
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来源期刊
Ultrasonics Sonochemistry
Ultrasonics Sonochemistry 化学-化学综合
CiteScore
15.80
自引率
11.90%
发文量
361
审稿时长
59 days
期刊介绍: Ultrasonics Sonochemistry stands as a premier international journal dedicated to the publication of high-quality research articles primarily focusing on chemical reactions and reactors induced by ultrasonic waves, known as sonochemistry. Beyond chemical reactions, the journal also welcomes contributions related to cavitation-induced events and processing, including sonoluminescence, and the transformation of materials on chemical, physical, and biological levels. Since its inception in 1994, Ultrasonics Sonochemistry has consistently maintained a top ranking in the "Acoustics" category, reflecting its esteemed reputation in the field. The journal publishes exceptional papers covering various areas of ultrasonics and sonochemistry. Its contributions are highly regarded by both academia and industry stakeholders, demonstrating its relevance and impact in advancing research and innovation.
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