兵器近场水下爆炸对目标的毁伤特性研究

Study of Damage Characteristics of Huge Warship Subjected to Near-field Underwater Explosion

近场水下爆炸气泡在壁面Bjerknes力和浮力的共同作用下产生朝向结构的高速射流。此时,气泡脉动由于受物面影响,其作用并不明显,所以近场兵器爆炸产生载荷主要为冲击波和气泡射流载荷。文中将气泡射流形状等效为水柱射流,基于水锤理论得到气泡射流载荷。同时采用Geers&Hunter半经验半解析模型得到冲击波载荷。将冲击波和气泡射流的总载荷加载到近场结构上,采用声固耦合原理计算舰船结构的响应,得到了兵器近场水下爆炸对目标的毁伤特性。

The bubbles caused by near-field underwater explosion produce high velocity jet toward the structure under the action of Bjerknes force and buoyancy. Since the bubble impulsion is affected by object surface,its influence on the structure is not evident,the loads mainly consist of shock waves and bubble jet. The shape of bubble jet is equal to water jet. The load of bubble jets is obtained based on the water hammer theory. Meanwhile,the shock wave load is drawn from the Geers & Hunter semi-analytical and theoretical solution. Finally the total load is applied on the near-field structure to get the responses of ship structure based on acoustic structure coupling method,and then get the damage characteristics of warship.