【摘 要】
：
In this paper,the flow field characteristics of Oblique Detonation Waves (ODWs)induced by a finite wedge under argon dilution are studied by solving the Euler equations with a detailed chemical model of hydrogen and air.First,the effects of the expansion
【机 构】
：
Department of Teaching Quality Evaluation,Yan’an University,Yan’an 716000,China;School of Mechanics,
论文部分内容阅读
In this paper,the flow field characteristics of Oblique Detonation Waves (ODWs)induced by a finite wedge under argon dilution are studied by solving the Euler equations with a detailed chemical model of hydrogen and air.First,the effects of the expansion waves,argon con-centration,geometric parameters,and Mach number on the ODW are discussed.The results show that the changes of these parameters may make the oblique detonation not be initiated.Then,the ODW initiation criterion of the finite wedge is summarized,as the characteristic length of the induc-tion zone LC and the characteristic length of the oblique wedge LW meet the condition LC/LW ＜ 1,the initiation of the ODW occurs;otherwise,it does not occur.What\'s more,the Constant Volume Combustion (CVC) theory is applied to study the characteristic length of induction zone.It is found that CVC theory is more suitable for the “smooth transition” type of ODW flow field,the theoret-ical and numerical characteristic length in induction regions are in good agreement.This work is of great significance for the design of oblique detonation engines for hypersonic vehicles.
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