Structure of oblique detonation wave at low inflow Mach number
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摘要: 利用Euler方程和两步化学反应模型，对低马赫数入流时的驻定斜爆轰波进行了数值模拟，并重点研究了斜爆轰波的驻定过程和结构。数值结果显示，当入流马赫数较低时，即使其本身是附体的，在诱导区后侧的高压区的作用下，斜爆轰波也会从其起始位置向来流方向运动。在这种情况下，斜爆轰波会驻定在靠近斜面前缘的位置，诱导区的长度仅有1 mm左右。通过设置初始条件，让斜爆轰波在斜面前缘附近被触发，则其将一直维持在靠近斜面前缘的位置。Abstract: With the Euler equations and a two-step chemical reaction model, a numerical investigation of the wedge-induced oblique detonation wave (ODW) at low inflow Mach number is performed in this paper. Its stabilization process and stationary structure are studied in detail via numerical simulation. It is found that the upstream propagating of an attached ODW at low inflow Mach number is resulted from the effect of the high pressure region behind the induction region. In this condition, the ODW is always stable in the vicinity of the wedge tip. The length of the induction region is about one millimeter. When the ODW is triggered near the wedge tip, it will stay in its vicinity.
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图 1 斜爆轰波计算域及其结构示意图
Figure 1. Schematic representation of computational domain and oblique detonation wave configuration
图 2 当(Ma)0=6.6、θ=26°时斜爆轰波的压力场
Figure 2. Pressure field of oblique detonation wave at (Ma)0=6.6, θ=26°
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