温压炸药隧道内爆炸结构约束对冲击波及爆炸火团的影响规律

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中图分类号：0382 国标学科代码：13035 文献标志码：A

Abstract：To investigate the propagationcharacteristicsof blastshock wavesandthethermal effectsoffirebalsin tunel explosions involving thermobaric explosives，numerical simulationswere conductedusing OpenFOAM.Thesimulation accuracy was validated throughcomparative analysis with experimental data from tunnelexplosion tests.Theeffectsof axial distance along the tunneland explosivemass onshock wave propagation characteristics and fireballthermal effects were systematicallystudied.Theresultsdemonstrate thatunderidentical charge mass conditions when theaxialdistanceexceeds1/3 of the equivalent tunneldiameter，theatenuationofshock wave overpresure peakand planar wave formationdistanceremain independentofaxial position.After planar waveformation，the impulse increases with axial distance beforestabilizing. Atthe same axial explosion distances，the planar waveformation distance increases with explosive mas. Post planar wave formation， theatenuationpatternof theshockwaveoverpressurepeak remainsunafected bychargemassIncontrast，theimpulse exhibits a growthtrend proportional tothe increase inchargemass.Under the influenceof the tunnel portal energydisipation effect （tunelefect），explosion-inducedfieballsexibitaconsistentpropagationtendencytowardteproximal tuelortal. Theconfinementimposedbytunnelwalsrestricts thelateral expansionof thefreballperpendicular totetunelaxis while facilitating the formationofahigh-temperature tipalong the longitudinal axis.Especially，thetemperaturedistributionalong thetunnelaxis maintains axial symmetry despitedirectional propagation biases.Afiting formula wasestablished to characterize therelationship between themaximumaxial propagation distanceof explosionfrebalsat different temperatures and theexplosive mass，enabling the predictionof axial spread limits for firebals at specific temperatures in typical thermobaric explosivedetonationswithin tunnel-confined environments.

Keywords：thermobaric explosive;shock wave; energy release effect; fireball temperature; tunnel confinement

温压炸药成分包含快速反应的理想组分（TNT、RDX、CL-20等）和缓慢反应的非理想组分（铝粉、黏结剂等）。（剩余17852字）