Experimentalinvestigationonloadingcharacteristics ofunderwaterexplosionfromabottomcharge
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摘要: 为获得沉底装药水中爆炸冲击波传播和气泡运动的一般规律,设计开展了沉底装药水中爆炸原理 性实验,通过观测记录装药沉底爆炸作用过程,并与装药自由场水中爆炸进行对比分析,得到主要结论:沉底 装药水中爆炸存在冲击波水底反射、气泡运动形成水底射流等复杂的载荷效应;沉底爆炸气泡呈半球形依附 在水底并同时急剧膨胀,其在收缩运动中连带水底介质颗粒迅速上浮,同时,气泡形状在水底射流作用下发生 显著变化;沉底爆炸冲击波压力呈指数衰减规律,无明显二次压力波,但由于水底介质作用而形成较强的水底 反射冲击波,一般使得迭加后的冲击波峰值压力高于入射波阵面压力。Abstract: Toinvestigatetheshockwavepropagationandthebubblemotionofunderwaterexplosion fromabottomcharge,principleexperimentsofunderwaterexplosionwereconductedinawatertank. High-speedcameraswereusedtocapturethegasbubbleformationandcollapse,andpressuretransducerstorecordpressuretimehistoriesatseverallocations. Comparedwiththeloadingcharacteristics ofthefree-fieldunderwaterexplosion,someconclusionswereobtained.Underwaterexplosionfroma bottomchargehasaseriescomplexloadingeffects:shockwavereflection,bubblesharpexpansion, bubblejetting,andsoon.Duetothebottominfluence,thebubbleshapeandbubblemigrationare significantlydifferentfromthoseofthefree-fieldunderwaterexplosion,andtheshockwavepropagationtakesonanexponentialdecay, buthasnotthesecondpressurewave.Forthepointsnearthebottomofthewatertank, theincidentwavecanbestrengthenedbytheshockwavereflectedfromthe bottom.
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Key words:
- mechanicsofexplosion /
- underwaterexplosion /
- bubble /
- bottomcharge /
- shockwave
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