Study on the transition patterns of the oblique detonation wave with varying temperature of the hydrogen-air mixture

Qin, Qiongyao; Zhang, Xiaobing

doi:10.1016/j.fuel.2020.117827

Cited by 12 publications

(2 citation statements)

References 45 publications

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“…Teng et al [15] put forward a criterion based on the difference between the detonation and OSW angles, which was more applicative in the cases with different inflow conditions. Furthermore, other criteria [16][17][18] based on velocities have also been proposed in recent years. Shi et al [19] proposed a theoretical criterion, depending on the ratio of the height of the compression wave intersection point and the corresponding height of OSW at the same x-location, which was applicable to hydrocarbon fuel-based mixtures.…”

Section: Introductionmentioning

confidence: 99%

Criticality for Oblique Detonation Waves Induced by a Finite Wedge in a Hydrogen–Air Mixture

Qin

Zhu

2023

Aerospace

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Two-dimensional oblique detonation waves (ODWs) induced by finite wedges in a stoichiometric hydrogen–air mixture have been investigated numerically based on reactive Euler equations with a detailed chemical reaction model. The main zone affected by the expansion wave emanating from the turning point of a wedge is the flowfield downstream of the intersection point of the oblique shock wave (OSW) and the expansion wave. The ODW would be reduced to Chapman–Jouguet (CJ) detonation or decoupled combustion downstream. Three combustion regimes, detonation, decoupled combustion, and no ignition, were observed successively, as the wedge length decreases. It is found that the location of the intersection point is a key parameter for the detonation initiation. When the intersection point is located upstream of the ODW transition point, the expansion wave may quench ODW. Then, the critical wedge length is obtained by theoretical analysis of wave structures and the initiation criterion of ODWs for finite wedges is proposed. When the wedge length is greater than the critical wedge length, ODWs can be initiated. On the contrary, the initiation of ODWs do not occur. For wedge lengths small enough, no ignition occurs. Previously proposed criteria that use the induction length are also examined and compared with the present critical wedge length criterion in this study, and the latter is proven to achieve better results.

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Section: Introductionmentioning

confidence: 99%

Criticality for Oblique Detonation Waves Induced by a Finite Wedge in a Hydrogen–Air Mixture

Qin

Zhu

2023

Aerospace

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“…Due to its destructive nature and rapid release of energy, a wealth of fundamental research on this subject can be found in the literature and has been of wide interest for terrestrial and astrophysical explosions [1][2][3][4]. In recent years, the application of detonation process in propulsion systems attracts more and more attention, resulting in several types of detonation-based engines [5][6][7][8]. Such emerging technology trend in aerospace warrants a renewed focus for detonation research in developing new technique to aid interpretation of flow data and predicting the unsteady dynamics of detonation in various combustors.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing shock front of unstable detonations based on multi-layer perceptron

Zhou

Teng

et al. 2021

Acta Mech. Sin.

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The dynamics of frontal and transverse shocks in gaseous detonation waves is a complex phenomenon bringing many difficulties to both numerical and experimental research. Advanced laseroptical visualization of detonation structure may provide certain information of its reactive front, but the corresponding lead shock needs to be reconstructed building the complete flow field. Using the Multi-Layer Perceptron (MLP) approach, we propose in this study a shock front reconstruction method which can predict evolution of the lead shock wavefront from the state of the reactive front. The method is verified through the numerical results of one-and two-dimensional unstable detonations based on the reactive Euler equations with a one-step irreversible chemical reaction model. Resultsshow that the accuracy of the proposed method depends on the activation energy of the reactive mixture, which influences prominently the cellular detonation instability and hence, the distortion of the lead shock surface. To select the input variables for training and evaluate their influence on the effectiveness of the proposed method, five groups, one with six variables and the other with four variables, are tested and analyzed in the MLP model. The trained MLP is tested in the cases with different activation energies, demonstrates the inspiring generalization capability. This paper offers a universal framework for predicting detonation frontal evolution and provides a novel way to interpret numerical and experimental results of detonation waves.

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The initiation characteristics of oblique detonation in acetylene-air mixtures in the finite wedge

Zhang

Xiang

et al. 2022

Acta Mech. Sin.

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Study on the transition patterns of the oblique detonation wave with varying temperature of the hydrogen-air mixture

Cited by 12 publications

References 45 publications

Criticality for Oblique Detonation Waves Induced by a Finite Wedge in a Hydrogen–Air Mixture

Criticality for Oblique Detonation Waves Induced by a Finite Wedge in a Hydrogen–Air Mixture

Reconstructing shock front of unstable detonations based on multi-layer perceptron

The initiation characteristics of oblique detonation in acetylene-air mixtures in the finite wedge

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