［19］马秋菊，邵俊程，万孟赛，等．点火位置对容器外部二次爆炸影响研究［J］．中国安全科学学报，2021，31(9):90－98.MAQJ，SHAOJC，WANMS，etal．Impactsofignitionpositiononsecondaryexplosionoutsidevessels［J］．ChinaSafetyScienceJournal，2021，31(9):90－98.Effectofdifferenttypesofobstaclesonventingdynamicsofmethane/airpremixedgasCHENXian-feng，ZHANGChun-cheng，LIYi，XUChuang，ZHIXue-ke(SchoolofSafetyScienceandEmergencyManagement，WuhanUniversityofTechnology，Wuhan430070，China)Abstract:Theventingprocessofmethane/airinthepipewithrigidandmembraneobstaclesisexperimentallystudied．Experimentsareperformedintheself-builtconnectionvesselwitha20Lsphericalvessel．Twocircularpipeshavealengthandinsidediameterof2mand60mmrespectively．Theventedducthasaninternalsizeof500mm×60mm×60mm．Theexperimentalvariablesaretheblockingrateofrigidobstaclesandthethicknessofmembraneobstaclestostudytheinfluenceofrigid/membraneobstaclesonmethane/airexplosionventing．Thedataacquisitioninstrumentssuchaspressuresensorsandhigh-speedcamerasareusedtocapturethepressurechangesandflamepropagationprocessintheexperiment．Theresultsshowthatinthesphericalcontainer，duetothehindrancefunctionofobstaclesonairflow，withtheincreaseoftheblockingratioandthickness，thepeakoverpressureandthemaximumpressurerisingrateincreaseaccordingly．Attheendofthepipeline，thegreaterthethicknessofthemembraneobstacleis，thestrongertheaccelerationeffectonthegasisafteritsrupture．Therefore，thepeakoverpressureandmaximumpressurerisingratearealsogreatlyimprovedwiththeincreaseofthemembraneobstaclethickness．However，withtheincreaseoftheblockingratioofrigidobstacles，thepeakoverpressureandthemaximumboostratefirstincreaseandthendecrease．Thisphenomenoniscloselyrelatedtotheacceleration/obstructioneffectofrigidobstaclesonairflow．Aftersettingrigid/membraneobstacles，the‘secondaryexplosion’occursintheexplosionventingpipe．Thedifferenceisthattheintensityofsecondaryexplosionincreaseswithincreasingmembraneobstaclesthickness，andincreasesfirstandth...
