近物面空泡溃灭机理实验及其教学应用方法

Experimental Investigation of Near-Wall Cavitation Bubble Collapse Mechanisms and Pedagogical Applications

  • 摘要: 空泡溃灭是空泡动力学研究中的关键问题之一。近年来,近物面空泡溃灭及其诱导的空蚀现象因其独特的物理特性和潜在的工程应用价值,成为实验与理论研究的热点。然而,该过程具有高度的瞬态性和复杂性,传统教学方法难以直观揭示其物理本质。本研究通过结合理论教学与实验观察,引导学生参与实践,构建了直观且深入的学习模式,有效提升了教学效果。为探讨近物面空泡溃灭的动力学行为,本文采用激光诱导空化气泡生成系统与冲击波纹影观测系统,结合高速摄像机、PCC软件以及超景深显微镜,实现了对溃灭过程及其造成的物面损伤的可视化观察与数据采集,从而系统分析其演化规律及物理机制。

     

    Abstract: Bubble collapse represents a fundamental problem in bubble dynamics, characterized by its intricate physical mechanisms and wide-ranging engineering implications. Recent studies have extensively focused on the collapse of cavitation bubbles near solid boundaries and the resulting erosion phenomena, driven by their unique nonlinear dynamics and potential applications in fields such as biomedical engineering and hydraulic systems. However, the transient and highly complex nature of this phenomenon poses significant challenges for traditional pedagogical approaches, which often fail to provide an intuitive understanding of the underlying physics. To address this limitation, we propose an integrated teaching framework that combines theoretical analysis with experimental visualization. This approach engages students directly in the experimental process, fostering a deeper comprehension of the physical principles involved. Specifically, a laser-induced cavitation system was utilized to generate bubbles near solid boundaries. The combination of high-speed imaging, a shock wave shadowgraph observation system, PCC software, and a micro-depth-of-field microscope enabled real-time visualization and quantitative analysis of the collapse dynamics and wall erosion. This methodology not only elucidates the evolution of bubble collapse but also provides insights into the associated flow structures and pressure fields.

     

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