【摘要】 基于有限速率基元化学反应模型和二维迎风型TVD格式的数值模拟方法,研究了3种不同形式的共用喷管设计对多管PDE非定常流动的影响。化学反应模型采用H2/O2/N2的11组分23步反应。数值研究的结果表明:共用喷管对多管PDE中流场产生了重要影响;单管点火的情况下,爆震波传播过程中由于喷管内表面作用产生的反射激波回传有利于旁通爆震管的起爆;喷管可以改变点火爆震管封闭端的压力变化历程,收敛扩张喷管的多管PDE封闭端的压力高于收敛喷管和扩张喷管;共用喷管使得各个爆震管的起爆和运转过程中存在相互影响,设计合理的共用喷管对优化多管PDE的性能和保证PDE协调工作具有重要作用。更多还原

【Abstract】 Numerical simulations based on upwind total-variation-diminishing(TVD) scheme combined with kinetic chemical reaction model are carried out for flow fields of single-pulse dual-tube pulse detonation engine(PDE) with three different common nozzles.Three common nozzle designs for convergent nozzle,divergent nozzle,and convergent-divergent nozzle are evaluated.The 11 species and 23 elementary reaction model for H2/O2/N2 mixture is used.The study indicates that the common nozzles have a significant effect on the flow field of the dual-detonation tube;the flow fields generated by single tube ignition can ignite the side detonation tube;nozzles affect the pressure on thrust wall and the change performance through the modification of gas expansion process.And the pressure on the thrust wall of ignition PDE with convergent-divergent nozzle is higher than that with convergent and divergent nozzles;common nozzle provides a direct path for intertube exhaust disturbance propagation.Thus a reasonable common nozzle can play an important role in optimizing performance and guaranteeing multi-tube PDE coordination work.更多还原