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Numerical study of inflow equivalence ratio inhomogeneity on oblique detonation formation in hydrogen-air mixtures


Numerical study of inflow equivalence ratio inhomogeneity on oblique detonation formation in hydrogen-air mixtures

Fang, Yishen, Hu, Zongmin, Teng, Honghui, Jiang, Zonglin and Ng, Hoi Dick (2017) Numerical study of inflow equivalence ratio inhomogeneity on oblique detonation formation in hydrogen-air mixtures. Aerospace Science and Technology . ISSN 12709638 (In Press)

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Official URL: http://dx.doi.org/10.1016/j.ast.2017.09.027


In this study, numerical simulations using Euler equations with detailed chemistry are performed to investigate the effect of fuel-air composition inhomogeneity on the oblique detonation wave (ODW) initiation in hydrogen-air mixtures. This study aims for a better understanding of oblique detonation wave engine performance under practical operating conditions, among those is the inhomogeneous mixing of fuel and air giving rise to a variation of the equivalence ratio (ER) in the incoming combustible flow. This work focuses primarily on how a variable equivalence ratio in the inflow mixture affects both the formation and characteristic parameters of the oblique detonation wave. In this regard, the present simulation imposes initially a lateral linear distribution of the mixture equivalence ratio within the initiation region. The variation is either from fuel-lean or fuel-rich to the uniform stoichiometric mixture condition above the oblique shock wave. The obtained numerical results illustrate that the reaction surface is distorted in the cases of low mixture equivalence ratio. The so-called “V-shaped” flame is observed but differed from previous results that it is not coupled with any compression or shock wave. Analyzing the temperature and species density evolution also shows that the fuel-lean and fuel-rich inhomogeneity have different effects on the combustion features in the initiation region behind the oblique shock wave. Two characteristic quantities, namely the initiation length and the ODW surface position, are defined to describe quantitatively the effects of mixture equivalence ratio inhomogeneity. The results show that the initiation length is mainly determined by the mixture equivalence ratio in the initiation region. Additional computations are performed by reversing ER distribution, i.e., with the linear variation above the initiation region of uniform stoichiometric condition and results also demonstrate that the ODW position is effectively determined by the ER variation before the ODW, which has in turn only negligible effect on the initiation length.

Divisions:Concordia University > Gina Cody School of Engineering and Computer Science > Mechanical, Industrial and Aerospace Engineering
Item Type:Article
Authors:Fang, Yishen and Hu, Zongmin and Teng, Honghui and Jiang, Zonglin and Ng, Hoi Dick
Journal or Publication:Aerospace Science and Technology
Date:21 September 2017
  • The National Natural Science Foundation of China NSFC Nos. 91641130 and 11372333
Digital Object Identifier (DOI):10.1016/j.ast.2017.09.027
Keywords:Oblique detonation; Equivalence ratio; Mixture inhomogeneity; Detailed chemistry
ID Code:983090
Deposited On:28 Sep 2017 18:20
Last Modified:01 Sep 2018 00:01


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