Numerical investigation on propagation behavior of gaseous detonation in water spray
Numerical investigation on propagation behavior of gaseous detonation in water spray
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DOI：
10.1016/j.proci.2018.07.092
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发表时间：
2019
影响因子：
3.4
通讯作者：
H. Watanabe;A. Matsuo;K. Matsuoka;A. Kawasaki;J. Kasahara
中科院分区：
文献类型：
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作者：
H. Watanabe;A. Matsuo;K. Matsuoka;A. Kawasaki;J. Kasahara
采用二维数值模拟方法研究了气相爆轰波在水喷雾中的传播行为及其结构。计算对象参考了G. Jarsalé等人，并且C2 H4-空气气态爆震在水滴（WD）被喷射的地方传播。使用的参数是C2 H4-空气当量比和WD质量分数。流场，Favre平均的一维轮廓，和细胞结构显示在2D模拟。气相爆轰波在水雾中稳定传播，速度相对于无波装置时的Chapman-Jouguet速度降低了3.2%。添加WD改变了细胞模式，特别是对于更瘦的混合物。弱三相点衰减，由于速度降低，诱导长度增加，晶胞宽度增加。WD的存在大大改变了爆震流场，蒸发主要发生在激波后10 mm处。高蒸发区以爆轰速度传播，爆轰波从两相介质反射形成的压缩波向后传播。此外，WD蒸发抑制速度，涡度和温度波动。与没有WD或Zel'dovich-von Neumann-Döring模型相比，WD的快速蒸发导致流体动力学厚度更低。
A two-dimensional (2D) numerical simulation is conducted to clarify the propagation behavior of gaseous detonation in a water spray and its structure. The computational target refers to the experiment conducted by G. Jarsalé et al., and C2H4–air gaseous detonation propagates where the water droplets (WDs) are sprayed. The parameters used are the C2H4–air equivalence ratio and WD mass fraction. The flow field, Favre-averaged one-dimensional profile, and cellular structure are revealed in 2D simulations. Stable propagation of gaseous detonation is observed in the water spray, and the decrease in velocity relative to the Chapman–Jouguet velocity without WDs is as much as 3.2%. Adding WDs changes the cellular pattern, especially for leaner mixtures. The weak triple point decays, and the cell width increases because of the longer induction length due to decreased velocity. The WD presence changes the detonation flow field substantially, and evaporation occurs primarily at 10 mm behind the shock wave. The high-evaporation region propagates at the detonation speed, and the compression wave formed when the detonation reflects from the two-phase medium propagates backward. Furthermore, WD evaporation suppresses the velocity, vorticity, and temperature fluctuations. Rapid evaporation with WDs leads to lower hydrodynamic thickness than that without WDs or in the Zel'dovich–von Neumann–Döring model.