激波绕射碰撞加速诱导爆轰的数值模拟

Numericalinvestigationsondetonationinitiationaccelerated bycollisionofdiffractedshockwaves

摘要: 基于单步化学反应的Euler方程和对激波(爆轰波)、接触间断具有良好捕捉效果的Roe/HLL混合格式以及自适应网格技术,模拟了激波在方形管中与方块障碍物相互作用,并发生绕射碰撞来诱导爆轰的过程。结果表明,弱激波在绕经方块时,形成上、下绕射激波并在方块尾部发生碰撞,生成局部高温高压点,可加快爆轰的形成;而当管内阻塞比超过一定值时,由于碰撞激波太弱则不能触发爆轰。
- 爆炸力学 /
- 碰撞 /
- 障碍物\激波\爆轰 /
- 燃烧
Abstract: Basedontheone-stepchemicalreactionEulerequations,thehighresolutionhybridRoe/ HLLschemeandtheadaptivemeshrefinement(AMR)methodwereemployedtonumericallyinvestigatetheprocessofdetonationinducedbythecollisionofthediffractedshockwavesinsideasquare tubewithacubemountedattheaxis.Andtheeffectsofthetubeblockageratioswerediscussedon thedetonationformation.Numericalresultsshowthatwhentheweakshockwavespassaroundthe squareobstruct,boththeupanddownweakshockwavediffractionsoccur,andtheycollidewitheach otherbehindtheobstructafteraperiodofexpansion,ahighpressureandtemperaturepointcanbe generatedduringthecollision,whichcanignitethecombustiblegasesandacceleratetheformationof detonation.However,withalargeblockageratio,astheshockwaveistooweakduringthecollision, thedetonationcannotbeinitiated.
- mechanicsofexplosion /
- collision /
- obstruct\shockwave\detonation /
- combustion