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摘要: 主要基于化学动力学和Ng模型,对C2H4-O2混合气体的爆轰胞格尺寸进行预测;结合Lee表面 积能量模型,预测物质在不同初始压力和化学当量比的条件下,直接起爆引起球面爆轰的临界起爆能量。直 接起爆实验主要采用高压电点火提供起爆能量,起爆能量通过放电过程中电流的输出信号确定。结果表明, 理论预测与实验值较吻合。首先,通过化学动力学计算得出ZND模型的爆轰参数,利用Ng模型得出爆轰胞 格尺寸与ZND诱导区长度之间的比例因数A 在不同初始压力与当量比的条件下分别为:A=43.815(1+p1/ p0)-0.12371和A=8.531exp(/3.135)+28.644,在此基础上对爆轰胞格尺寸进行定量预测。胞格尺寸的理论 预测与实验结果吻合。其次,把爆轰胞格尺寸作为中间特征参数并结合Lee的表面积能量模型,提出可以预 测临界起爆能量的定量模型,并得出C2H4-O2混合气体直接起爆的临界起爆能量与初始压力和化学当量比 的参量拟合关系分别为Ec=0.332(p1/p0)-2.017和Ec=exp[3.951(-1.401)2-1.9]。Abstract: ThedetonationcellsizefortheC2H4-O2 mixturewaspredictedbychemicalkineticsand Ngsmodel.AndtogetherwithLeessurfaceenergymodel,thecriticalenergywasestimatedforthe directinitiationofsphericaldetonationintheC2H4-O2 mixtureunderdifferentinitialpressuresandat differentequivalenceratios.Thedirectinitiationwasperformedviaahighvoltagecapacitorsparkdischargeandthecriticalenergywasaccuratelydeterminedfromthecurrent utputanalysis.Goodagreementwasfoundbetweenthetheoreticalpredictionandtheexperimentalmeasurement. Through steadyZNDanalysesbasedonacomprehensivekineticmechanismandbyusingtheimprovedsemiempiricalcorrelationbyNg, thefactorintherelationbetweenthecellsizeanditsZNDinductionzone length,i.e.,non-dimensionalparameterA,wasdeterminedatdifferentinitialpressuresandequivalenceratiosasfollowing: A=43.815(1+p/p0)-0.12371andA=8.531exp(/3.135)+28.644,respectively. Thecellsizecanbecalculatedultimatelyfromthesecorrelations,andtheexperimentally measuredcellsizesagreewellwiththetheoreticalpredictiondata.Thecellsizeisconsideredasaninputintermediatecharacteristicparameterandusedtoestimatethecriticalenergyfordirectinitiation basedonLeessurfaceenergymodel.Thecombinationofchemicalkineticsandtheoreticalmodels mayformaquantitativetheorytopredictthecriticalenergyfordirectinitiation.Thetheoreticalcurve fitoftheparametricrelationshipbetweenthecriticalinitiationenergyandtheinitialpressureaswell astheequivalenceratioisEc=0.332(p/p0)-2.017andEc=exp[3.951(-1.401)2-1.9],respectively.
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Key words:
- mechanicsofexplosion /
- criticalinitiationenergy /
- directinitiation /
- C2H4-O2 mixturegas /
- cellsize /
- chemicalkinetics /
- sparkignition
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