驻定斜爆轰波起爆条件与结构的数值模拟研究

Numerical Investigation of Standing Oblique Detonation Wave Initiation Conditions and Structures

关键词:  驻定斜爆轰波  来流马赫数  楔面角  数值模拟  起爆

Key words:  Standing oblique detonation wave  Inflow Mach number  Wedge angle  Numerical simulation  Initiation

摘要:

为了探究驻定斜爆轰波的起爆条件以及来流马赫数和楔面角对斜爆轰波形态结构的共同影响，基于二维欧拉方程和单步化学反应模型，对驻定斜爆轰波进行数值模拟研究。结果发现，斜爆轰波的起爆和结构受到来流马赫数和楔面角的显著影响，来流马赫数越小，形成斜爆轰波的楔面角条件越苛刻。随着来流马赫数和楔面角增加，波后混合气体温度升高，爆轰反应变得更加剧烈，使得斜激波诱导区域变短，未反应气团减少，接触间断面更靠近楔面，下游出现的涡结构也减少。

Abstract:

To study the conditions of standing oblique detonation wave’s initiation and the effects of the inflow Mach number and the wedge angle on oblique detonation waves’ structure， numerical method to simulate standing oblique detonation waves was developed and two-dimensional Euler equations with the single-step reaction model were involved. The results show that the initiation and structure of oblique detonation waves are significantly influenced by the inflow Mach number and the wedge angle. For smaller inflow Mach number， the wedge angle of successfully initiating the oblique detonation wave is located in a smaller range. With the increase of the inflow Mach number and the wedge angle， the temperature behind the wave increases and the detonation reaction becomes more intense， which makes the initiation length decrease， the amounts of unreacted pockets become smaller， the contact discontinuity surface get closer to the wedge and less vortex structures appear downstream.