Numerical investigation on the induction zone structure of the oblique detonation waves

Teng, Honghui; Zhang, Yining; Jiang, Zonglin

doi:10.1016/j.compfluid.2014.03.001

Cited by 60 publications

(22 citation statements)

References 23 publications

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“…Besides the main ODW surface, the second oblique detonation wave (SODW) appears in the shocked gas, with a regular reflection on the wedge. Similar structure has been observed except with the Mach reflection of SODW on the wedge [11,13]. Increasing M in into 9.2, one more complicated structure form as shown in Fig.…”

Section: (Lower)supporting

confidence: 57%

“…Usually the SODW has the Mach reflection on the wedge, generating the so called "Y" bifurcation shock [11,12]. Its interaction will induce the Mach stem between the SODW and SIDW, bringing several wave configurations hard to be analyzed.…”

Section: (Lower)mentioning

confidence: 99%

“…A number of parametric studies were carried out numerically to investigate the dependence of the transition type on various initial conditions and flow parameters such as the incoming flow Mach number, wedge angle and the reactivity of the mixture 9,10 . Besides the transition type, the wave structures near the transition region have been simulated, and several kinds of shock systems are observed 11,12,13 . These structures are found to become complicated when the incident Ma decreases, but it is still lack of theory to predict its formation and characteristic length scale.…”

Section: Introductionmentioning

confidence: 99%

“…To study the initiation, one-step irreversible heat release model used in previous studies 14,15,16 is over-simplified because it can't model the induction zone. Some studies 11,17 use the detailed chemical kinetics, which are much expensive. Multi-step chain branching kinetics has been proposed, inheriting the simplicity of global kinetics but enough to model the initiation, and used in the detonation instability research 18,19,20 .…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of oblique detonation initiations with chain-branching kinetics

Teng

Yang

Jiang

2017

55th AIAA Aerospace Sciences Meeting

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Oblique detonations induced by semi-infinite wedge are simulated by solving Euler equations with chain branching kinetics. Numerical results show the initiation can be triggered by either the abrupt transition or smooth transition, dependent on incident Ma M in and wedge angle θ, and then their effects on the oblique detonation angle β and initiation length L ini are analyzed. When θ increases, L ini decreases monotonically but β has a minimum value, corresponding to θ = 29° in this study. When M in decreases, both L ini and β increases monotonically until M in decreases below certain critical value, M in = 9.2 in this study. Then low inflow Ma effects generate the maximum L ini , with the complex of ODW (oblique detonation wave), SODW (secondary oblique detonation wave) and SIDW (selfignition deflagration wave). The transient process is observed, demonstrating the structure can self-adjust to find a proper position. The wave structure suggests two wave/heat release process determining the detonation initiation. In the cases with high M in featured by SIDW, the oblique-shock induced self-ignition dominates, and L ini increases when M in decreases. In the cases with low M in featured by SODW, the interaction of ODW and SODW dominates, and L ini decreases when M in decreases.

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Section: (Lower)supporting

confidence: 57%

Section: (Lower)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Numerical study of oblique detonation initiations with chain-branching kinetics

Teng

Yang

Jiang

2017

55th AIAA Aerospace Sciences Meeting

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“…Teng and Jiang 25 analyzed the structural differences of these two transition processes as a function of different chemical and aerodynamic parameters, and from there proposed criteria to characterize the transition type. Furthermore, the observed transient structures are also dependent on the inflow Mach number toward the wedge and chemical activation energy, 26,27 making the modeling of realistic oblique detonations even more complex.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of oblique detonation wave initiation in a stoichiometric hydrogen-air mixture

et al. 2015

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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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