不规则爆轰中的三相点碰撞与未燃气包成因
Triple Point Collision and Origin of Unburned Gas Pockets in Irregular Detonations
摘要：
通过每半反应长度600个点的高分辨率数值模拟，研究了不规则爆轰波的湍流结构。目的是探讨三相点与槽壁碰撞和反射过程中横波的性质。在此基础上，研究了未反应气袋的形成和消耗机理。结果表明，当三相点与壁面碰撞时，横向激波与未反应袋相互作用。在三相点反射离开壁之后，横波与壁相互作用。发现该结构是一个双马赫配置，并没有改变之前和之后的反射。在爆轰单元的后半部分，三相点和横波同时与壁面碰撞。强横波从碰撞前的一个主三相点转换到反射后的一个新的三相点。一段时间后，壁面反射出一个弱的三相点，因此该结构更象一个单马赫构形。在爆轰盒的后半部分，由于三相点和横波同时与壁面相互作用，在壁面上出现了较大的高压区。在反射过程中，反应区与激波阵面分离，并产生一个未燃烧的气体包。在爆轰单元末端的爆轰再引发机制中，发现有三种机制是重要的：i：通过湍流混合消耗未燃烧的空穴而重新获得能量ii：由于壁面上的三相点碰撞而产生压缩波，这有助于激波突然跳跃到过驱动爆轰iii：Richtmyer Meshkov不稳定性的急剧增长导致部分锋相对于相邻部分加速。
英文摘要：
The turbulent structure of an irregular detonation is studied through very high resolution numerical simulations of 600 points per half reaction length. The aim is to explore the nature of the transverse waves during the collision and reflection processes of the triple point with the channel walls. Consequently the formation and consumption mechanism of unreacted gas pockets is studied. Results show that as the triple point collides with the wall, the transverse shock interacts with the unreacted pocket. After reflection of the triple point off the wall, the transverse wave interacts with the wall. The structure found to be of a double Mach configuration and does not change before and after reflection. In the second half of the detonation cell the triple point and the transverse wave collide simultaneously with the wall. The strong transverse wave switches from a primary triple point before collision to a new one after reflection. After some time a weak triple point reflects off the wall and hence the structure exhibits more like a single Mach configuration. Due to simultaneous interaction of the triple point and the transverse wave with the wall in the second half of the detonation cell, a larger high pressurized region appears on the wall. During the reflection the reaction zone detaches from the shock front and produces a pocket of unburned gas. Three mechanisms found to be of significance in the re initiation mechanism of detonation at the end of the detonation cell; i: energy resealed via consumption of unburned pockets by turbulent mixing ii: compression waves arise due to collision of the triple point on the wall which helps the shock to jump abruptly to an overdriven detonation iii: drastic growth of the Richtmyer Meshkov instability causing a part of the front to accelerate with respect to the neighboring portions.
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