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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