摘要
通过加压容器进行深水爆炸模拟试验是一种经济、有效的研究手段,但加压容器内的复杂试验环境对深水爆炸研究造成较大影响。为了获得球形密闭加压容器内水下爆炸的载荷特性,通过在球型压力罐内进行了不同药量、不同加压条件下的水下爆炸试验,获取了典型位置处富含冲击波入射、反射汇聚及气泡脉动等基本特征的载荷时程曲线,并对其进行了初步分析。基于试验结果,采用Ls-dyna软件对装药在压力罐中的水下爆炸进行了数值仿真研究,详细分析了冲击波载荷的演化过程,揭示了壁面反射波导致气泡脉动特性改变的机理。分析了环境压力、加压气腔体积等参数对气泡脉动的影响规律。研究结果表明,壁面反射冲击波会产生汇聚效应,其对气泡的压缩作用改变了气泡脉动特性;当壁面反射冲击波在气泡膨胀阶段作用于气泡时,对气泡脉动特性的影响最大。此外,加压气腔体积对气泡脉动周期也有较大影响。
The simulation of deepwater explosion in a high pressure container is an economical and effective trial method. However,the test environment is different with free field water area due to the multiple reflected shock waves induced by limited water boundary,which affects the use of pressure container. To investigate the characteristics of the shock wave and bubble impulse in the high pressure spherical closed container,a series of the underwater explosion experiments with different charges and initial environment pressure are conducted. A variety of phenomena are observed in the internal fluid field. The pressure verse time curves,obtained by pressure sensors,include the characteristics of direct shock wave,gathering of reflected waves as well as bubble impulse. The deepwater explosion in high pressure spherical closed container is simulated by LS-DYNA code. The evolution of shock wave in the container is showed in detail. The variation of the shock waves at different locations and the bubble impulse are discussed.Finally,the load and the responses of test items in the in-container test and the free field test are analyzed.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2015年第S1期108-114,共7页
Acta Armamentarii
关键词
爆炸力学
水下爆炸
密闭容器
冲击波
气泡脉动
explosion mechanics
underwater explosion
closed container
shock wave
bubble impulse
