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中文摘要：
气泡在近自由液面运动过程中与自由液面发生强烈的耦合作用，自由液面会出现极其复杂的物理现象，形成的水冢类型繁多。本文将针对皇冠型水冢，基于势流理论，建立气泡与自由液面耦合作用的数值模型，并在气泡完成射流向下运动时，忽略气泡对自由液面的影响，继续模拟自由液面的运动过程。同时利用高速摄影对近自由面的电火花气泡进行实验研究，数值结果与实验符合良好，相对误差在10%以内。通过数值计算，发现了围裙卷缩和主峰珠化等特殊的物理现象，研究了气泡初始条件与韦伯数对皇冠型水冢动态特性的影响，旨为皇冠型水冢的研究提供参考。
英文摘要：
Strong interaction between bubble and free-surface will cause complex phenomena, producing many different types of spike. Based on potential flow theory, a numerical model was established to simulate the crown spike. A downward jet was formed during the bubble＇s collapsing, and simulation of the free-surface was continued regard less of the ring bubble＇s effect on it. Simulation results show good agreement with the experiment conducted with a high speed camera and a spark-generated device, and the relative error was less than 10%. Some special phenomena were found through numerical calculation, such as apron-shrink and peak-dropped. Finally, the effects of initial condition and Weber number on crown-type water column were studied.
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