为了研究不同气流量下气泡帷幕对水下冲击波的衰减特性，采用高速摄像探究气泡帷幕在受到冲击波冲击后形态变化，结合冲击波压力时程曲线进行分析。结果表明，气泡帷幕中的气泡受到冲击波作用后会发生数次膨胀收缩行为，随着气流量增加，气泡膨胀的最大直径增大，第一次膨胀收缩周期变长；且气泡帷幕对水下冲击波压力有很强的衰减作用，气流量上升幅度越大，冲击波压力峰值衰减越明显，在气流量40L/min下，冲击波峰值衰减高达88.98%；气流量大于20L/min后，冲击波冲量衰减幅度均大于50%。针对气流量大小与压力峰值下降幅度的关系进行曲线拟合，提出适用于该工况下的经验方程，以期指导实际工程。
Abstract
In order to study the attenuation characteristics of the bubble curtain on the underwater shock wave under different air flow rates, the morphological changes of the bubble curtain after the shock wave were explored by using high-speed photography, and the analysis was carried out based on the time-history curve of the shock wave pressure. The results show that the bubbles in the bubble curtain will expand and contract several times after being subjected to shock wave. With the increase of gas flow rate, the maximum diameter of bubble expansion increases and the first period of bubble expansion and contraction becomes longer. And the bubble curtain has a strong damping effect on the underwater shock wave pressure. The larger the gas flow rate rises, the more obvious the peak attenuation of shock wave pressure is. Under the gas flow rate of 40L/min, the peak attenuation of shock wave pressure is as high as 88.98%. When the gas flow rate is greater than 20L/min, the attenuation amplitude of shock wave impulse is greater than 50%. Based on the curve fitting of the relationship between the gas flow rate and the drop range of the peak pressure, the empirical equation suitable for the working condition is put forward in order to guide the practical engineering.
关键词
气泡帷幕 /
高速摄像 /
冲击波峰值压力 /
曲线拟合
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Key words
bubble curtain /
High-speed photography /
Shock wave peak pressure /
Curve fitting
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