Criticalenergyfordirectinitiationofsphericaldetonations inC2H2-O2-ArandC2H2-N2O-Armixtures
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摘要: 采用高压电点火进行直接起爆形成爆轰,起爆能量通过放电过程中电流的输出信号确定。首先通 过实验测定并对比C2H2-O2-Ar和C2H2-N2O-Ar等2种混合物在各种初始状态下直接起爆形成爆轰的临界 起爆能量。实验结果表明,在相同状态下C2H2-N2O-Ar混合物的临界起爆能量显著高于C2H2-O2-Ar混合 物的。进一步基于各物质爆炸特征长度和爆轰临界管径的参量关系对临界起爆能量差异性进行分析,得到了 C2H2-N2O-Ar混合气体的爆轰临界管径预测曲线,并在此基础上得出C2H2-N2O-Ar混合物爆炸特征长度 与临界管径的关系为r0=2.5dc,而C2H2-O2-Ar两者关系为r0=2dc。结果清晰地表明,使用N2O 作为氧化 剂,爆炸特征长度与爆轰临界管径之间的比例因数增大,表明该物质直接起爆形成爆轰所需的起爆源单位能 量增大,因而直接形成爆轰的临界能量相应提高。Abstract: Directinitiationwasachievedviaahigh-voltagecapacitorsparkdischargeandthecriticalenergywasaccuratelyestimatedfromtheanalysisofthecurrentoutput. Experimentswerecarriedout tomeasurethecriticalenergiesofC2H2-O2-ArandC2H2-N2O-Armixturesunderdifferentinitialconditions. ThecriticalenergiesforC2H2-N2O-ArmixturesaresignificantlyhigherthanthoseforC2H2- O2-Armixturesunderthesameinitialconditions.Therelationbetweenexplosionlengthandcritical tubediameterwasanalyzedtoexplorethelargediscrepancyofthecriticalenergybetweenthosemixtures. ThecriticaltubediametermeasurementinC2H2-N2O-Armixtureswasfurtherinvestigated, andbasedonthecriticaltubediametercorrelation,therelationshipbetweenexplosionlengthandcriticaltubediameterforC2H2- O2-Armixtureswasfoundtober0=2.5dc.Andthecorrespondingrelationshipisr0= 2dcforC2H2-O2-Armixtures.ItdisplaysthattheproportionalfactorbetweenexplosionlengthandcriticaltubediameterwillincreaseifN2Oisusedasanoxidizer, whichresultsinmore initiationenergyperunitrequiredforinitiatingthemixturetoachieveadirectdetonation.Thusthe criticalenergyofdirectinitiationtendstobehigher.
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Key words:
- mechanicsofexplosion /
- criticalinitiationenergy /
- directinitiation /
- C2H2-O2-Ar /
- detonation /
- explosionlength /
- criticaltubediameter
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