Structure of Conical Oblique Detonation Waves

Harris, Paul G.; Farinaccio, Rocco; Stowe, Robert; Sislian, J. P.; Link, R.; Alexander, Derrick; Donahue, L.; Parent, Bernard

doi:10.2514/6.2008-4687

Cited by 4 publications

(3 citation statements)

References 17 publications

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“…The oblique detonation surface extends downstream and becomes eventually unstable with the generation of triple points and cellular instability. This cone-induced oblique detonation structure is the commonly observed one 38,49 and is similar to that induced by a semi-infinite wedge. [16][17][18] Similar results can be observed by reducing θ to 38°, while keeping the same Mach number M in = 8.…”

Section: Problem Formulation and Numerical Methodssupporting

confidence: 63%

Initiation structure of oblique detonation waves behind conical shocks

Yang

Teng

et al. 2017

Physics of Fluids

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The understanding of oblique detonation dynamics has both inherent basic research value for highspeed compressible reacting flow and propulsion application in hypersonic aerospace systems. In this study, the oblique detonation structures formed by semi-infinite cones are investigated numerically by solving the unsteady, two-dimensional axisymmetric Euler equations with a one-step irreversible Arrhenius reaction model. The present simulation results show that a novel wave structure, featured by two distinct points where there is close-coupling between the shock and combustion front, is depicted when either the cone angle or incident Mach number is reduced. This structure is analyzed by examining the variation of the reaction length scale and comparing the flow field with that of planar, wedge-induced oblique detonations. Further simulations are performed to study the effects of chemical length scale and activation energy, which are both found to influence the formation of this novel structure. The initiation mechanism behind the conical shock is discussed to investigate the interplay between the effect of the Taylor-Maccoll flow, front curvature, and energy releases from the chemical reaction in conical oblique detonations. The observed flow fields are interpreted by means of the energetic limit as in the critical regime for initiation of detonation.

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Section: Problem Formulation and Numerical Methodssupporting

confidence: 63%

Initiation structure of oblique detonation waves behind conical shocks

Yang

Teng

et al. 2017

Physics of Fluids

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“…The aforementioned studies are based on twodimensional flow fields. If a conical shock wave is considered, the flow field will differ from the wedge flow to some extent due to the curvature effect and the presence of the Taylor-Maccoll flow [9,17,18]. In addition to the wedge flow and conical flow, the spherical flow is another major concern for ODW initiation and standing stability.…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of Disturbance Resistance of Oblique Detonation Waves

Liu

Xiao

Wang

et al. 2020

International Journal of Aerospace Engineering

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The stability of oblique detonation waves (ODWs) is a fundamental problem, and resistance of ODWs against disturbances is crucial for oblique detonation engines in high-speed propulsion. In this work, numerical studies on ODW stability in disturbed flows are conducted using the two-dimensional reactive Euler equations with a two-step induction-reaction kinetic model. Two kinds of flow disturbances are, respectively, introduced into the steady flow field to assess ODW stability, including upstream transient high-pressure disturbance (UTHD) and downstream jet flow disturbance (DJFD) with different durations. Generally, an ODW is susceptible to disturbances at larger wedge angles and stable at smaller wedge angles. In the unstable wedge angle range, different ODW structures and transition patterns are obtained after disturbances, including different locations of the primary triple points, different numbers of the steady triple points on the wave surface, and different transition patterns from the leading oblique shock wave to the ODW. It is found that the primary triple point tends to move upstream for the disturbances that can form a local strong detached bow shock wave near the wedge tip. In contrast, the wave surface and the transition pattern are susceptible to all of the disturbances introduced in this study. Despite the unstable responses of the ODWs to the disturbances, the ODWs can keep standing stability after disturbances, which is beneficial to the propulsion application of ODWs.

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“…However, a deep knowledge of the oblique structure found in ODWE is still lacking and must be fully addressed. For simplicity, most of the previous studies [5][6][7][8][9][13][14][15][16][17][18][19][20] used simplified chemical reaction models, mainly the one-step irreversible Arrhenius kinetic model. In addition, the inflow parameters are usually set artificially, deviating far from those in actual ODWE applications.…”

Section: Introductionmentioning

confidence: 99%

A Slope Constrained 4th Order Multi-Moment Finite Volume Method with WENO Limiter

Sun

Teng

Xiao

2015

Commun. Comput. Phys.

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Two-dimensional, oblique detonations induced by a wedge are simulated using the reactive Euler equations with a detailed chemical reaction model. The focus of this study is on the oblique shock-to-detonation transition in a stoichiometric hydrogenair mixture. A combustible, gas mixture at low pressure and high temperature, corresponding to the realistic, inflow conditions applied in oblique detonation wave engines, is presented in this study. At practical flight conditions, the present numerical results illustrate that oblique detonation initiation is achieved through a smooth transition from a curved shock, which differs from the abrupt transition depicted in the previous studies. The formation mechanism of this smooth transition is discussed and a quantitative analysis is carried out by defining a characteristic length for the initiation process. The dependence of the initiation length on different parameters including the wedge angle, flight Mach number, and inflow Mach number is discussed. Despite the hypothetical nature of the simulation configuration, the present numerical study uses parameters we deem relevant to practical conditions and provides important observations for which future investigations can benefit from in reaching toward a rigorous theory of the formation and self-sustenance of oblique detonation waves. C 2015 AIP Publishing LLC. [http://dx

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Structure of Conical Oblique Detonation Waves

Cited by 4 publications

References 17 publications

Initiation structure of oblique detonation waves behind conical shocks

Initiation structure of oblique detonation waves behind conical shocks

Numerical Study of Disturbance Resistance of Oblique Detonation Waves

A Slope Constrained 4th Order Multi-Moment Finite Volume Method with WENO Limiter

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