This paper examines blast mitigation based on geometric means, namely a perforated plate or a chain mail, with or without a water film cover. This method may be used for the protection of structures, and its effectiveness and limitations were assessed. First, a shock tube was used to visualize the interaction of a blast wave profile with a metallic grid or with a metallic grid covered by a layer of water. Secondly, free-field air blast experiments were performed in order to evaluate the protection system under real conditions. Three types of grids were tested. The first was a metallic plate having small round holes, the second had large round holes, and the third had square holes. A chain mail made of steel rings was also tested. The porosity of the grids ranged from 48 to 69%. In case of a collision between a shock wave and a grid, it was observed that one part of the incident shock wave was reflected by the plate. The remaining part was transmitted through the plate. The overpressure and the impulse downstream from the grid were reduced, and the reduction increased when the porosity decreased. When a film of water covered the grid, it was observed that the water film disintegrated into droplets long after the passage of the blast wave. Filling the holes with water enhanced the overpressure and impulse reduction as it contributed to the reflection of the shock wave.

本文研究了基于几何手段的减震效果，即带有或不带有水膜覆盖层的多孔板或锁链。该方法可用于结构保护，并评估其有效性和局限性。首先，使用激波管可视化爆炸波轮廓与金属网格或被水层覆盖的金属网格之间的相互作用。其次，进行了自由场空气冲击试验，以评估真实条件下的保护系统。测试了三种类型的网格。第一个是具有小圆孔的金属板，第二个是具有大圆孔的金属板，第三个是具有方孔的金属板。还测试了由钢环制成的锁子甲。网格的孔隙率范围为48％至69％。万一冲击波与电网发生碰撞，观察到入射冲击波的一部分被板反射了。其余部分通过板子透射。降低了电网的超压和下游冲量，并且当孔隙率降低时，降低量增加。当水膜覆盖格栅时，观察到在爆炸波通过很长时间后，水膜分解成液滴。用水填充孔会增加超压并减少脉冲，因为它有助于冲击波的反射。观察到在爆炸波通过很长时间后水膜崩解成小滴。用水填充孔会增加超压并减少脉冲，因为它有助于冲击波的反射。观察到在爆炸波通过很长时间后水膜崩解成小滴。用水填充孔会增加超压并减少脉冲，因为它有助于冲击波的反射。