不同孔间距的气泡帷幕对水中冲击波衰减特性的影响OA北大核心CSTPCD

In order to explore the effect of hole spacing on the wave attenuation ability of bubble curtains,four dif-ferent bubble curtain generators with hole spacing of 2,5,8 cm and 11 cm were designed,and the attenuation effect of bubble curtains with different hole spacing on shock waves in water was analyzed.Taking the distance between the explo-sion source and the sensor as 60 cm,and the bubble curtain located between the explosion source and the sensor at a hori-zontal distance of 50 cm from the explosion source as the experimental conditions,it was found that an increase in air flow rate would enhance the attenuation effect of the bubble curtain with the same hole spacing on shock waves.Moreover,after the air flow rate reaches 40 L/min,the wave attenuation effect of the four types of bubble curtains will tend to stabilize.When the air flow rate is the same,as the depth of the explosion source entering the water increases,the protective ability of the bubble curtain first increases and then decreases.All the four types of bubble curtains have the best protective effect when the depth of the explosion source entering the water is 60 cm.The wave attenuation ability of bubble curtains with dif-ferent hole spacing under the same air flow rate was compared.When the gas flow rate is 60 L/min,the corresponding wave attenuation ability of the inter hole spacing from large to small is 54.80%,61.40%,88.56%,and 89.27%,respective-ly.This indicates that reducing the inter hole spacing will improve the wave attenuation ability of the bubble curtain.If the spacing between holes continues to decrease from 5 cm,the wave elimination ability of the bubble curtain will no longer sig-nificantly improve.As the hole spacing decreases,the specific impulse of the shock wave will also decrease,greatly wea-kening the energy of the explosive after reaching the target and reducing its ability to damage the protected object.