The cellular structure of a two-dimensional H<sub>2</sub>/O<sub>2</sub>/Ar detonation wave

Hu, Xiangyu; Khoo, Boo Cheong; Zhang, D L; Jiang, Zonglin

doi:10.1088/1364-7830/8/2/008

Cited by 63 publications

(56 citation statements)

References 23 publications

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“…Because of generation of regular cellular patterns, self-sustaining CJ detonations for hydrogen-oxygen mixtures highly diluted with argon in low pressure are ideal candidates for detonation simulations [30]. Here, a stoichiometric H 2 ∕O 2 ∕Ar mixture with a molar ratio 2∶1∶7 under the condition of pressure 6.67 kPa and temperature 298 K is used, which has been extensively demonstrated to produce very regular cellular detonation [31,32]. The mixture flows in the channel at a given velocity.…”

Section: Computational Modelmentioning

confidence: 99%

Detonation interaction with cavity in supersonic combustible mixture

Cai¹,

Liang²

2017

21st AIAA International Space Planes and Hypersonics Technologies Conference

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= depth of the cavity, cm L = width of the cavity, cm l ig = induction length of one-dimensional Zel'dovich-von Neumann-Döring model, mm Pts∕l ig = number of the grid points distributed in the induction length V CJ = Chapman-Jouguet velocity, m/s X 1 = length of the straight channel, cm X 2 = width of the hot jet, cm X 3 = distance from the hot jet edge to the front edge of the cavity, cm X 4 = distance from the rear edge of the cavity to the outflow boundary, cm Y 1 = height of the channel, cm

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Section: Computational Modelmentioning

confidence: 99%

Detonation interaction with cavity in supersonic combustible mixture

Cai¹,

Liang²

2017

21st AIAA International Space Planes and Hypersonics Technologies Conference

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“…The reactive Euler equations for multiple thermally perfect species are used as governing equations, which read ( ) A c c e p t e d M a n u s c r i p t 7 Mach and Radulescu, 2010;Hu et al, 2004;Mahmoudi and Mazaheri, 2012), numerical and experimental investigations (Mahmoudi and Mazaheri, 2011;Radulescu and Lee, 2002;Radulescu et al, 2005) indicate the existence of two kinds of detonation structures which are classified as regular (weakly unstable) and irregular (highly unstable) detonations.…”

Section: Computational Modelmentioning

confidence: 99%

Numerical Investigation on Detonation Control Using a Pulse Hot Jet in Supersonic Combustible Mixture

Cai

Liang

Deiterding

2016

Combustion Science and Technology

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Abstract:To investigate the mechanism of detonation control using a pulse hot jet in the supersonic hydrogen-oxygen mixture, high-resolution simulations with a detailed reaction model were conducted using an adaptive mesh refinement method. After the successful detonation initiation, a contractive passway was generated between the hot jet and the main flow field behind the detonation front. Due to the contractive passway, the expansion of detonation products was prevented, hence resulting in overdriven detonation. By setting up various contractive passways through adjusting the width of the hot jet, the overdrive degree of overdriven detonation also changes. It is suggested that the width of the hot jet has approximately linear relation with the relative and absolute propagation velocities. When the contractive passway gradually disappeared after the shutdown of the hot jet, overdriven detonation attenuated to the dynamically stable Chapman-Jouguet (CJ) detonation. When the contractive passway was re-established once again after the re-injection of the hot jet, the CJ detonation developed to the same overdriven detonation, indicating that the contractive passway controlled by the pulse hot jet can indeed control detonation propagation in the A c c e p t e d M a n u s c r i p t 2 supersonic combustible mixture to some extent.

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“…Sharpe referring to Short and Quirk (1997) results stated that for detonations with realistic chain-branching reactions, a few hundred points per half-reaction length may be required to obtain correct solutions. Hu et al (2004) studied the cellular structure and its evolution in a low-pressure Ar O H / / 2 2 mixture using a nine-species, 19 elementary reactions model. In their studies the grid resolution varied from 55 to 440 points per reaction zone (8 to 64 grid points per induction zone length).…”

Section: Grid Resolution Studymentioning

confidence: 99%

“…The detonation front instability results in the periodic motion of a triple-wave configuration on it. This triple-wave configuration usually consists of an incident shock wave, Mach stem and transverse wave (Hu et al, 2004). The transverse waves that extend into the reaction zone, move periodically up and down perpendicular to the leading shock and divide it into two parts consisting of Mach stem and incident shock.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Cellular Structure of Weak Detonation and Evaluation of Linear Stability Analysis Predictions

Barkhordari

Farshchi

2013

Engineering Applications of Computational Fluid Mechanics

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This paper investigates the development of cellular structures created by the propagation of a detonation wave in a gaseous mixture. Two dimensional reactive Euler equations with an idealized one-step Arrhenius type reaction model are solved using the PPM scheme coupled with the exact Riemann solver. The numerical flow solver simulates the evolution process of regular cellular structures of a weakly unstable detonation wave. The cellular structures are generated by two-dimensional sinusoidal perturbations imposed on a ZND detonation wave. The initial sinusoidal perturbation wavelengths are predicted from linear stability analysis. The objective of these calculations is to examine the validity of the linear stability analysis predictions on the final cell sizes of a weakly unstable detonation. We found that for a given mixture, there is not just a single detonation cell size related to the wavelength with maximum growth rate. Instead, depending on the initial perturbation wavelength, the cellular dynamics reaches a final equilibrium state with the corresponding final cell size that belongs to a specific band of unstable wavelengths predicted by the linear stability analysis. Indeed, it is not the magnitude of the perturbation growth rate, but the magnitude of its rate of change with respect to the wavelength that predicts the domain of this specific band and corresponding final cell sizes.

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The cellular structure of a two-dimensional H₂/O₂/Ar detonation wave

Cited by 63 publications

References 23 publications

Detonation interaction with cavity in supersonic combustible mixture

Detonation interaction with cavity in supersonic combustible mixture

Numerical Investigation on Detonation Control Using a Pulse Hot Jet in Supersonic Combustible Mixture

Numerical Simulation of Cellular Structure of Weak Detonation and Evaluation of Linear Stability Analysis Predictions

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The cellular structure of a two-dimensional H2/O2/Ar detonation wave

Cited by 63 publications

References 23 publications

Detonation interaction with cavity in supersonic combustible mixture

Detonation interaction with cavity in supersonic combustible mixture

Numerical Investigation on Detonation Control Using a Pulse Hot Jet in Supersonic Combustible Mixture

Numerical Simulation of Cellular Structure of Weak Detonation and Evaluation of Linear Stability Analysis Predictions

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The cellular structure of a two-dimensional H₂/O₂/Ar detonation wave