Two-dimensional numerical simulation on galloping detonation in a narrow channel
Two-dimensional numerical simulation on galloping detonation in a narrow channel
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DOI：
10.1016/j.proci.2012.06.132
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发表时间：
2013
期刊：
影响因子：
--
通讯作者：
N. Tsuboi;Y. Morii;A. Hayashi
中科院分区：
文献类型：
--
作者：
N. Tsuboi;Y. Morii;A. Hayashi
采用二维全N-S方程数值模拟了二维驰振爆轰过程。在层流假设下，d= 5 mm（约为氢气半反应长度的2倍）的窄通道中的爆轰波在传播过程中表现出具有两次起爆的驰振爆轰特征。这两次起爆之间的距离约为1300 mm，这导致了领先冲击波之后的感应时间。随着通道宽度的增加，驰振特征逐渐减弱。d=10和15 mm时，爆轰波传播速度比DCJ低约4%。通过增加通道宽度，爆轰的强度增加，如最大压力的历史所示。爆轰波后湍流的影响表明，虽然其传播速度变为0.9DCJ，但驰振特征消失。爆轰波的传播强度明显弱于在宽通道中传播的爆轰波，这一特征与层流假设相似。NS模拟中的速度亏损趋势与η=0.25的修正ZND计算的趋势相当一致。
The numerical simulations of the two-dimensional galloping detonation performed by using two-dimensional full Navier–Stokes simulations with a detailed chemistry model are presented. The detonation in a narrow channel with d=5mm, which is approximately twice the half-reaction length of hydrogen, shows a feature of galloping detonation with two initiations during its propagation under the laminar flow assumption. The distance between these two initiations is approximately 1300mm, which causes the induction time behind the leading shock wave. As the channel width increases, the galloping feature diminishes. The detonation propagates approximately 4% lower than DCJfor d=10 and 15mm. By increasing the channel width, the strength of the detonation increases, as shown in the maximum pressure histories. The effects of turbulence behind the detonation show that the galloping feature disappears, although its propagation velocity becomes 0.9DCJ. The strength of the detonation becomes significantly weak compared with the detonation propagating in the wide channel widths, and this feature is similar to the laminar assumption. The trend of the velocity deficits in the NS simulations agrees fairly well with the trend of the modified ZND calculations with η=0.25.