浓度梯度对T型管中爆轰波传播特性的影响

Effect of Concentration Gradient on Detonation Wave Propagation Characteristics in T-tube

针对爆轰波在浓度梯度作用下衍射、熄爆到再起爆过程,基于开源软件OpenFOAM研究了两种不同混合气在3种不同浓度梯度下流场特征.结果表明:随着浓度梯度增大,横向爆轰波强度会减弱,爆轰波更易解耦.前导激波与浓度梯度相互作用会使爆轰波面发生弯曲,并且改变横向爆轰波和马赫杆的传播过程.对于稳定气体(H_(2)/O_(2)/Ar),爆轰波在管长范围内没有成功起爆;对于不稳定气体(C_(2)H_(4)/O_(2)),爆轰波成功起爆.

To study the effect of concentration gradient on detonation wave diffraction,detonation quenching and re-initiation in a T-tube,the flow field characteristics under two mixtures with three concentration gradients were analyzed based on the open source software OpenFOAM.Results show that the strength of the transverse detonation decreases and detonation is more likely to quench with the increase in the concentration gradient.The interaction between the leading shock and the concentration gradient makes the detonation front bend and changes the propagation process of transverse detonation wave and the Mach stem.For a stable mixture(H_(2)/O_(2)/Ar),the detonation cannot reinitiate,while the detonation successfully reinitiate for an unstable mixture(C_(2)H_(4)/O_(2)).