Matchingcharacteristicsofwaveandflameinthedeflagration todetonationtransitionprocess
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摘要: 为了解氢燃料爆震过程中压力波与火焰之间相互匹配的特性,在60mm60mm2000mm 方 爆震管内,用氢气和空气混合物进行了单爆震性能研究。在爆震转捩区内布置压力传感器与离子探针,用来 监控压力波和火焰的信号,同时利用高速摄影仪集中拍摄转捩区域。根据压力波和火焰面在爆震管不同时刻 的强度特性、速度特性及位置特性来分析爆震过程中波与火焰匹配的规律。结果表明:压力波和火焰的强度 呈现为相互正反馈匹配性质;缓燃向爆震转捩(DDT)过程中,压力波和火焰的速度表现为相互交替的变化过 程,且缓燃阶段中火焰速度的增幅大于压力波速度的增幅;当火焰面追赶上激波时,产生过爆,火焰面会临时 位于激波前面;在过爆衰减为正常爆震波的过程中,激波在火焰前面。Abstract: Aseriesofsingle-shotdetonationexperimentswereperformedtounderstandthematching characteristicsofwaveandflameinDDTforH2/airmixuresina60mmsquaretubethatwas2min length.Theion-probesandpressuretransducerswererespectivelyutilizedtogetthesignalofflame andwave,andhigh-speeddigitalimagingwasusedtotrackflamepropagationofDDTarea.The matchingruleofshock-flamewasachievedbyanalyzingtheintensity、velocityandpositioncharacteristicsofwaveandflameindifferenttimealongthetube. Theresultsindicatethatintensityofwaveand flameispositivefeedbackcharacteristicandthevelocityof waveandflameisalternantchange process.Thespeedamplitudeofflameisrapidthanthatofwaveindeflagrationphase.Thisresultin theoverdriverndetonationwaveformandflameistemporarilyinfrontofflamewhenflamecatchup wave.Shockisinfrontofflameinphasewhichtheoverdriverndetonationevolveintosteadydetonationwave
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Key words:
- mechanicsofexplosion /
- flamesurface /
- DDT /
- combustion /
- detonation /
- wave
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