Numerical study on viscous flow field and initiation evolution of oblique detonation waves
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摘要:
为探究黏性效应对斜爆轰波波阵面的影响，认识斜爆轰波（ODW）起爆过程的特性，基于高分辨率求解器，开展斜劈诱导斜爆轰波的无黏/有黏数值计算。研究表明：有黏计算条件下惰性斜激波的波角值明显大于无黏计算，同时耦合下游分离泡的影响，使得斜激波后诱导点火长度减小。由于有黏计算中壁面上分离泡的分离/再附激波自身具有不稳定性，分离/再附激波与斜爆轰波波阵面作用更易促使类胞格结构形成。斜爆轰波的起爆可认为是由斜激波诱导的燃烧波与斜激波碰撞引发的，形成的斜爆轰波继而在三波点牵引下向外膨胀；燃烧波强度对最终准稳态流场中强过驱斜爆轰波区域尺度有明显影响。
Abstract:To investigate the influences of viscous effects on the oblique detonation wave (ODW) front, and discern the essential characteristic for the evolution of ODW initiation, an inviscid/viscous simulation was conducted with a high-resolution numerical solver to study the wedge-induced ODW. It was manifested that the wave angle of inert oblique shock wave (OSW) for viscous computation was larger than that for inviscid computation, which contributed to a short induction ignition length behind OSW with consideration of the influence of separation bubble downstream. For viscous simulation, owing to the unsteady characteristics of the separation/attachment shock wave aligned to the separation bubble on the wall, the cellular-like structures of ODW front appeared more quickly. The initiation of ODW was triggered by the collision between shock-induced combustion and OSW, and ODW expanded outward subjecting to the triple-point; especially, the strength of the combustion wave had a significant influence on the scale of strong overdriven ODW region in quasi-steady flow field.
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Key words:
- oblique detonation wave /
- viscous effect /
- wave front /
- shock-induced combustion /
- initiation
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图 1 数值计算的物理模型和流场结构示意图
Figure 1. Schematic diagram of physical model for numerical computation and flow configuration
图 2 3种网格大小下斜激波/斜爆轰波后诱导点火长度沿程分布（θwed=29°）
Figure 2. Induction ignition length profiles along the OSW/ODW front for three grid sizes （θwed=29°）
图 3 不同数值方法下斜爆轰流场温度云图和局部数值纹影
Figure 3. Temperature contour and zoom-in numerical schlieren of ODW flow-field for various numerical methods
图 4 不同数值方法得到的斜激波/斜爆轰波的波阵面后参数
Figure 4. Parameters behind oblique shock/detonation wave front with various numerical method
图 5 当Ea/R∞T∞=30时不同时刻的斜爆轰波三波点局部数值纹影和过三波点的流线
Figure 5. Zoomed-in numerical schlieren near ODW triple-point and streamline with different time snapshots for Ea/R∞T∞=30
图 6 不同活化能条件下强过驱斜爆轰波后亚声速区域
Figure 6. Subsonic region behind strong overdriven ODW for various activation energy
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