摘要:
为了探索整装式液体工质电热化学炮中药室边界形状对燃烧控制的影响,采用数字高速录像系统
对等离子体射流在液体工质中的扩展过程进行了测试,研究了不同放电电压、不同喷嘴直径、不同渐扩边界结
构下等离子射流与液体工质的相互作用特性。获得了等离子射流在液体工质中扩展形态的时间序列图,处理
出不同工况下Taylor空腔扩展的轴向位移与时间的关系曲线,计算并分析了不同工况下等离子射流在液体
工质中的扩展速度和相互作用的机理。研究结果表明:Taylor空腔的轴向扩展速度具有波动性,但总体上呈
衰减趋势。渐扩台阶处,径向湍流增强,强化了等离子射流的回流卷吸效应。
Abstract:
Toexploretheinfluenceofthechamberboundaryshapeonthecombustioncontrolina
bulk-loadedliquid-mediumelectrothermal-chemicalgun,theplasmajetpropagationintheliquidmediumwasexperimentallyinvestigatedbyusingahigh-
speeddigitalcamera.Specialattentionwaspaidto
theplasmajet-liquidmediuminteractionundertheconditionsofdifferentdischargevoltages,different
nozzlediametersanddifferentdivergentboundaries.Thetime-sequencephotosoftheplasmajetpropagationintheliquidmedium
wereobtained,fromthephotostheaxialdisplacementhistoriesofthe
Taylorcavitywereachievedunderthedifferentconditions,andthecorrespondingpropagationvelocitiesoftheTaylorcavitywerecalculated.
Sequentially,theinteractionmechanismbetweentheplasma
jetandtheliquidmediumwasanalyzed.TheresultsindicatethatthoughtheaxialvelocityoftheTaylorcavityisfluctuant,
asawholeitisdecrescent;andthatatthewallsteps,theradialturbulenceof
theplasmajetisenhanced,whichcanstrengthentheentrainmenteffectofreflux.
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