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基于Fay流体扩张理论,运用实验观测、数值模拟和理论分析等方法研究了侧向膨胀对爆震波传播过程的影响。详细分析了爆震波在侧向膨胀段的流场结构,由于气体可压缩壁面限制性作用较弱,爆震波强度受到不同程度衰减,波面发生一定变形,横波数量明显减小且横波间距增大。对比研究了预混气活性对爆震波流场结构和传播过程影响,实验发现预混气活性较高时,即ER=1.0,爆震波能够抵御侧向膨胀衰减影响,能够自持传播;预混气活性较低时,即ER=0.7,其抵御侧向膨胀能力较弱,速度亏损变大,波面变形严重,爆震波解耦而熄爆。若要维持爆震波在气体可压缩壁面稳定传播,需要一定活性来抵御侧向膨胀影响。
Based on the Fay fluid expansion theory, the effects of lateral expansion on the propagation of a detonation wave were studied by means of experimental observation, numerical simulation and theoretical analysis. The structure of the flow field of the detonation wave in the lateral expansion section is analyzed in detail. The detonation wave intensity is attenuated to some extent due to the limited restrictive effect of the gas compressible wall surface, the wave surface is deformed to a certain extent, the number of the transverse waves is obviously reduced, and the spacing of the transverse waves is increased. The effect of premixed gas on the structure and propagation of the detonation wave field was compared. The experimental results show that ER = 1.0. The detonation wave can resist the influence of lateral expansion and decay, When the activity is low, ie, ER = 0.7, its ability to resist lateral expansion is weak, the speed loss becomes larger, the wave surface deforms seriously, and the detonation wave is decoupled and extinguished. To maintain a stable propagation of the detonation wave on the gas compressible wall, some activity is required to counteract the effects of lateral expansion.