金属桥箔电爆炸驱动飞片过程流场瞬态观测与数值模拟

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中图分类号：O383;TJ45 国标学科代码：13035 文献标志码：A

Abstract：Shockinitiationandignitiontechniquesdrivenbyelectricallyexplodedmetalicbridgefoilswith insulatingflyers have been widely implemented in initiation and ignition system of weapon.To adressthe deficiencyin existing research regarding the descriptionoftheflowfield evolution during the motionofflyer and promote the development ofthis technology towardsefficient energyutilizationand miniaturization，adouble-pulse laserschlieren transientobservationsystem was constructed.Thissystemenables the acquisitionofdensitydistributionsof theflowfieldandthemotion distanceof theflyerat diferen time.Additionaly，atwo-dimensionalaxisymmetric fluid dynamicscalculation modelandcalculationmethodforthe motionprocessofflerdivenbytheelectricexplosionofmetalfoilwerestablsed，andcoespondingumeicalsilation calculations wereperformed inconsideration oftheevolutionlaws ofthe flow field inside andoutside theaccelerationchamber under theeffectsof the motionofflyer，thecompressionof shock wave，andtheexpansionof high-temperatureand highpressure plasma.The phase transition of bridge foil fromsolid phase to plasma phasewas described by phase transition fraction，the state of plasma with high temperatureand pressre was described bythestate equation of plasma which consider thechanges in particle numberand coulomb interaction between particles，andthe motionofflyer was described bydynamic grid model.Thecalculatedflowfielddensitydistributioncloselymatches theexperimentalresults，andthe maximumerors in flyer motion distance and velocity are 6.1% and 8.1% ，respectively，validatingthe accuracy of thecalculation model and calculation method. The research results indicate that when the capacitance is 0.33μF and the initiation voltage is 2800V within the research range， the maximum pressure in the flow field remains approximately 1×107 Pa; the temperature in the flow field gradually decreases from 9950K at 516 ns to 3100K at 2310ns ； and the plasma phase distribution in the flow field gradually evolvesfromaflat shape toalong strip shape，withthe maximumdifusiondistanceof plasma in the direction perpendicular to the motion of the flyer being 0.8mm . At136O ns， upon th flyer's breakthrough of the shock-wave front，a distinct bulge-shaped profile emerges inthe leading edge ofboth pressure and temperature distributions within theflow field.

Keywords：metal foil; electric explosion; flyer; flow field

战场环境的愈发复杂恶劣以及现代武器系统的快速发展，对武器弹药系统的安全性提出了更严苛的要求。（剩余13637字）