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摘要: 基于带化学反应的二维轴对称Euler方程,利用带有Superbee限制函数的波传播算法,对氢/氧/ 氮预混气中飞行圆球诱导斜爆轰进行了数值模拟。结果表明,在达姆科勒数Da略大于临界情形时,圆球诱导 的驻定爆轰是一个由强过驱斜爆轰、弱过驱斜爆轰、反应激波和惰性激波组合而成的复合结构。波后的圆球 绕流流场内存在2个亚音速区和1个超音速区。在圆球背风表面,还形成了第2道斜激波。Abstract: Basedonthetwo-dimensionalaxisymmetricEulerequationscouplingwithchemicalreactions, thephenomenaofobliquedetonationinducedbyahypervelocityballinhydrogen-oxygen-nitrogen mixturewerenumericallystudiedbyusingwavepropagationalgorithm withSuperbeelimiter. Theresultsshowthatthestandingdetonationinducedbyaballshowthecompositestructureat Damkohlernumberconditionslightlylargerthanthethreshold,whosestructureiscomposedofa strongoverdrivenobliquedetonation,aweakoverdrivenobliquedetonation,areactingshockwave andainertshockwave.Thereweretwosubsoniczoneandasupersoniczoneintheflowpastasphere afterwave.Thesecondobliqueshockwavewasformedintheleewardsurfaceoftheball.
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Key words:
- mechanicsofexplosion /
- compositestructure /
- detonation /
- hypervelocityball
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