Research on the protective ability of multi-layer bubble curtain against underwater explosion
In order to explore the protective ability of multi-layer bubble curtain against underwater explosion,three different layers of bubble curtain with 1,2 and 3 layers are designed.Combined with the change of air flow rate,the influence of the change of layer number on shock wave attenuation ability and surrounding surface vibration velocity is analyzed.Under experimental conditions,when the total air flow rate is 40 L/min,the single-layer bubble curtain has a better effect on reducing the peak pressure of shock wave than the air curtain with other layers.The total air flow rate is between 40-50 L/min,the protective effect of three different layers of bubble curtain is almost the same,and the wave absorbing ability is about 75％.When the total air flow rate is greater than 50 L/min,the protective effect of multi-layer bubble curtain is gradually better than that of single-layer bubble curtain,and the more layers,the stronger the wave absorbing ability of bubble curtain.Under the same air flow rate,the more layers of the bubble curtain,the smaller the specific impulse of the shock wave reaching the target area,and the lower the destruction ability of the surrounding area.The vertical main vibration frequency of the ground near the blasting point is concentrated around 17 Hz,and the vertical vibration speed is much larger than that of other directions,and will gradually decrease with the increase of air flow.At low gas flow rate,the single-layer air curtain has a better damping effect of vibration velocity.With the increase of gas flow rate,the more layers of bubble curtain,the stronger the damping ability of vibration velocity.
NETL
NSTL
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