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摘要: 对爆轰波在环形圆管(预混气体为2H2/O2/Ar)内的传播分别进行了实验和数值研究。实验研究 采用烟迹板记录了环形圆管内爆轰波的胞格结构。数值计算利用二阶附加半隐的Runge-Kutta法和五阶 WENO格式分别离散欧拉方程的时间和空间导数项,采用基元反应简化模型描述化学反应过程,得到了旋转 爆轰的流场及数值胞格结构。实验和数值模拟结果表明:爆轰波在圆环管中传播时,由于圆环的内壁发散、外 壁收敛,圆环内侧爆轰强度小于外侧,胞格尺寸较大;内侧OH 的分布区域大于外侧,浓度较低。旋转爆轰的 这种性质,使爆轰波能以稳定的角速度绕轴旋转。
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关键词:
- 爆炸力学 /
- 旋转爆轰 /
- 二阶附加半隐的Runge-Kutta法 /
- 胞格结构 /
- 自持机理
Abstract: Gaseousdetonationpropagationof2H2/O2/Armixtureinanannulartubewasexperimentallyandnumericallyinvestigated. Detonationcellularpatternswererecordedbysmokedfoils.The second-orderadditivesemi-implicitRunge-Kutta(ASIRK)methodandthefifth-orderweightedessentiallynon- oscillatory(WENO)schemewereusedtodiscretizethetimetermandthespatialderivatives, respectively.Adetailedchemicalreactionmechanism modelwasappliedtodescribetheprocessesofdetonationchemicalreactions. Numericalcellularpatternsanddetonationflowfieldwereobtained. Experimentalandnumericalresultsshowthatwhiledetonationpropagatesintheannular tube,duetotheconvergenceoftheouterwallandthedivergenceoftheinnerwall,thedetonationintensityalongtheinnerwallislowerthanthatalongtheouterwall, andthecellsizeismuchlarger. ThedistributionregionofOHalongtheinnerwallisalsowiderthanthatalongtheouterwall,and theconcentrationissmaller.Justbecauseofthecharacterofarotatingdetonation,thedetonation wavescanrotatearoundanaxisatasteadyangularvelocity. -
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