Behaviorsofbubblejetsinducedbyunderwaterexplosion ofcylindricalchargesunderfree-fieldconditions
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摘要: 为研究柱形装药水中爆炸气泡射流特性,采用高速摄影方法在实验水箱中对PETN药柱进行水中 爆炸实验,初步获得了有关柱形装药自由场水中爆炸气泡运动的数据资料。研究结果表明:柱形装药自由场 水中爆炸形成气泡的运动与球形装药的存在差别,药柱放置方式的变化也会导致水中爆炸气泡产生性质迥 异的运动。当药柱水平放置时,气泡表面的运动呈非对称性,气泡的不对称坍塌将产生不对称的射流,且射流 的影响区与长径比有关;当药柱垂直放置时,气泡表面的运动和射流呈轴对称。在同等药量下,药柱垂直放置 时形成的射流速度比药柱水平放置时高。Abstract: UnderwaterexplosionexperimentswerecarriedoutforPETNcylindersinawatertankand elementarydataaboutbubblemotionsunderfree-fieldconditionswereobtainedbyusingthehighspeedphotographytechnology. Resultsshowthatthebubbledynamicsofcylindricalchargesdiffers fromthoseofsphericalones,andchargemountingmodesaffectmarkedlybubblebehaviors.Fora horizontallymountedcylindricalcharge,asymmetriccollapseisachievedduetotheasymmetricmotionofthebubbleinterface. Asaresult,anasymmetricjetisformedandthewidthofthejetvaries withthelength-diameterratioofthecharge.Ontheotherhand,foraverticallymountedcylindrical charge,asymmetricjetisgeneratedduetotheaxialsymmetricmotionofthebubbleinterface.Inthe caseofequal-weightcharges,thevelocityofthejetgeneratedbytheverticallymountedcylindrical chargeishigherthanthatgeneratedbythehorizontally-mountedone.
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Key words:
- mechanicsofexplosion /
- waterjetbehavior /
- underwaterexplosion /
- bubble /
- cylindrical charge
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