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

机译：氢-空气混合物斜向爆轰形成时当量比不均匀性的数值研究

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摘要

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. (C) 2017 Elsevier Masson SAS. All rights reserved.
机译：在这项研究中，使用具有详细化学信息的Euler方程进行了数值模拟，以研究燃料-空气成分的不均匀性对氢-空气混合物中斜爆轰波（ODW）引发的影响。这项研究的目的是更好地理解实际操作条件下的倾斜爆震波发动机的性能，其中包括燃料和空气的不均匀混合，从而导致进入的可燃流中的当量比（ER）发生变化。这项工作主要集中于流入混合物中的可变当量比如何影响倾斜爆轰波的形成和特征参数。在这方面，本模拟首先在起始区域内施加混合物当量比的横向线性分布。从贫油或富油到倾斜冲击波以上的均匀化学计量混合条件，变化都很大。所得数值结果表明，当混合当量比低时，反应表面变形。观察到所谓的“ V形”火焰，但与以前的结果不同，它没有与任何压缩或冲击波耦合。分析温度和物质密度的演变还表明，贫燃料和富燃料的不均匀性对斜向冲击波后面的起始区域中的燃烧特征有不同的影响。定义了两个特征量，即起始长度和ODW表面位置，以定量描述混合物当量比不均匀性的影响。结果表明，引发长度主要取决于引发区域内的混合物当量比。通过逆转ER分布进行额外的计算，即在均匀化学计量条件的起始区域上方具有线性变化，并且结果还表明ODW位置由ODW之前的ER变化有效地确定，这反过来对ODW的影响微不足道。起始长度。 （C）2017 Elsevier Masson SAS。版权所有。

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  • 来源
    《Aerospace science and technology》 |2017年第12期|256-263|共8页
  • 作者

    Fang Yishen; Hu Zongmin; Teng Honghui; Jiang Zonglin; Ng Hoi Dick;

  • 作者单位

    Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China;

    Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China;

    Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China|Beijing Inst Technol, Sch Aerosp Engn, Dept Mech, Beijing 100081, Peoples R China;

    Chinese Acad Sci, Inst Mech, State Key Lab High Temp Gas Dynam, Beijing 100190, Peoples R China;

    Concordia Univ, Dept Mech Ind & Aerosp Engn, Montreal, PQ H3G 1M8, Canada;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Oblique detonation; Equivalence ratio; Mixture inhomogeneity; Detailed chemistry;

    机译：斜爆轰;当量比;混合物不均匀;详细化学;

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