一维脉冲爆轰波的能量释放规律研究  

Energy release law of one-dimension pulse detonation wave

作　　者：滕宏辉[1] 刘云峰[1] 姜宗林[1] 

机构地区：[1]中国科学院力学研究所高温气体动力学国家重点实验室,北京100190

出　　处：《空气动力学学报》2012年第6期731-736,共6页Acta Aerodynamica Sinica

基　　金：国家自然科学基金(90916028)

摘　　要：采用三步链锁反应模型,对一维脉冲爆轰波进行了数值模拟,研究了爆轰波传播过程中的能量释放规律。结果表明,虽然不同稳定性的脉冲爆轰波具有不同的振荡幅度和波长,但是在单位距离的能量释放及其在内能、动能之间的分配比例是不变的。爆轰波的不稳定性源于激波和燃烧的耦合,而这种耦合关系可以通过前导激波和能量释放之间的相位差定量描述,具有较大相位差的爆轰波传播过程中振幅较大。同时相位差可以解释更不稳定的双模振荡爆轰波的传播机理,由于较长的波长和较大的相位差产生了矛盾,爆轰波进而分解成两种振荡模态,使相位差减小避免了爆轰波的熄灭。One-dimension pulse detonation waves are simulated with three-step chain-branching reaction mechanism, and the propagation mechanism is discussed from the viewpoint of the energy release. Numerical results show both the average energy release and the ratio of the internal and kinetic energy are invariant al- though the detonation waves show different oscillation characteristics. The phase difference of the shock and post-shock combustion is used to explain the instability derived from the shock, and the unstable detonation has the larger phase difference. The phase difference also provides the physical understanding of the double- model pulse detonation waves, which overwhelms the large oscillation length and phase difference to avoid the detonation quench.

关 键 词：爆轰波 不稳定性 相位差 

分 类 号：O382[理学—流体力学]