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2 5 4 !"#,$%,&'(,)*+,,-.
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NumericalSimulationoftheFactorsAffectingtheIgnitionThresholdofanExplodingFoilInitiator
QIAN Shichuan,GAN Qiang,REN Zhiwei,CHENG Nianshou,FENG Changgen
(StateKeyLaboratoryofExplosionScienceandTechnology,BeijingInstituteofTechnology,Beijing100081,China)
Abstract:Tostudytheinfluenceofthetransducercomponentcomposedofbridgefoil,flyerandacceleratingchamberontheex
plodingfoilinitiator(EFI)ignitionperformanceandachievethegoalofreducingtheignitionthreshold,ANSYS/AUTODYN soft
warewasusedtosimulatetheprocessthatbridgefoildrivenflyertodetonateHNS Ⅳ.Theinfluenceofbridgefoilthicknessonfly
erspeedwasstudied,andtheinfluencesofbridgeareawidth,flyermaterial(organicglass,ceramicandpolyimide),flyerthick
nessandacceleratingchamberlengthonEFIignitionthresholdwereinvestigated.Resultsshow thatreducingthewidthofbridgear
eaishelpfultoreducetheignitionthresholdofexplodingfoilinitiator.Underthesameinputvoltage,thespeedofflyerdrivenby
bridgefoilwiththicknessof2μ m ismaximum.Theignitionvoltageofexplodingfoilinitiatordecreasesfirstlyandthenincreases
withtheincreaseofflyerthickness,andtheignitionvoltageislowestwhenthethicknessis10μ m.Comparedwith0.225mm,
0.250mm and0.275mm acceleratingchamber,ignitionvoltageof0.125mm oneislowest,soreducingtheaccelerationchamber
lengthisbeneficialforreducingignitionthresholdofexplodingfoilinitiator.Undertheconditionofdeterminigtheaccelerating
boreaperture,“infinite”acceleratingchamberisbetterthan“finite”acceleratingchamberforreducingfiringvoltageofEFI.Poly
imidehasbettermechanicalproperties,lowerignitionvoltageandlowerkineticenergycomparedwithothertwomaterials(organ
icglassandceramic).
Keywords:militarychemistryandpyrotechnictechnology;explodingfoilinitiator;fluidsolidcoupling;numericalsimulation;ig
nitionthreshold
CLCnumber:TJ45 Documentcode:A DOI:10.11943/j.issn.10069941.2018.03.008
ChineseJournalofEnergeticMaterials,Vol.26,No.3,2018(248 - 254) !"#$ www.energeticmaterials.org.cn