The propagation mechanism of cellular detonation

Lee, J. H. S.

doi:10.1007/978-3-540-27009-6_3

Cited by 14 publications

(5 citation statements)

References 8 publications

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“…This range of activation energies which approximately corresponds to the stoichiometric gas mixture 2H 2 +O 2 at P 0 = 1 bar and T 0 = 293K has been studied numerically [20,40]. It is well established that hydrodynamic instabilities and diffusive processes play profound role in the propagation of detonations in such mixtures [15,16,21,36,37,41].…”

Section: Boundary and Initial Conditionsmentioning

confidence: 99%

High resolution numerical simulation of triple point collision and origin of unburned gas pockets in turbulent detonations

Mahmoudi

Mazaheri

2015

Acta Astronautica

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Section: Boundary and Initial Conditionsmentioning

confidence: 99%

High resolution numerical simulation of triple point collision and origin of unburned gas pockets in turbulent detonations

Mahmoudi

Mazaheri

2015

Acta Astronautica

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“…Compressible turbulence in detonation may be generated by various interactions such as shockshock, shock-shear-layer, shock-vortex, and shear-layer-shearlayer interactions. Lee [18] argued that this enhances turbulent mixing in unstable detonations and supplements the shock ignition mechanism.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, the state of a turbulent reaction zone and the consumption mechanism of unreacted gas pockets have remained mostly unexplored [1,19,20]. It has been shown [4,12,15,16,18,21] that in strongly unstable detonations diffusive turbulent mixing plays a key role in propagation. However, in weakly unstable detonations the main shock front is responsible for the initiation of the reaction and turbulent phenomena are of minor importance.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic Instabilities in Gaseous Detonations: Comparison of Euler, Navier–Stokes, and Large-Eddy Simulation

Mahmoudi

Karimi

Deiterding

et al. 2014

Journal of Propulsion and Power

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A large-eddy simulation is conducted to investigate the transient structure of an unstable detonation wave in two dimensions and the evolution of intrinsic hydrodynamic instabilities. The dependency of the detonation structure on the grid resolution is investigated, and the structures obtained by large-eddy simulation are compared with the predictions from solving the Euler and Navier-Stokes equations directly. The results indicate that to predict irregular detonation structures in agreement with experimental observations the vorticity generation and dissipation in small scale structures should be taken into account. Thus, large-eddy simulation with high grid resolution is required. In a low grid resolution scenario, in which numerical diffusion dominates, the structures obtained by solving the Euler or Navier-Stokes equations and large-eddy simulation are qualitatively similar. When high grid resolution is employed, the detonation structures obtained by solving the Euler or Navier-Stokes equations directly are roughly similar yet equally in disagreement with the experimental results. For high grid resolution, only the large-eddy simulation predicts detonation substructures correctly, a fact that is attributed to the increased dissipation provided by the subgrid scale model. Specific to the investigated configuration, major differences are observed in the occurrence of unreacted gas pockets in the high-resolution Euler and Navier-Stokes computations, which appear to be fully combusted when large-eddy simulation is employed.

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“…Detonation is a complex phenomenon occurring at supersonic speeds that involve a shock front followed by a reaction zone. Although the study of this phenomenon has a long history, the physics of detonation wave propagation is still an area of active study due to it practical importance [1,2]. In recent years, the interest in pulse detonation engines has also attracted considerable attention to the study of detonations in tubes or ducts [3,4].…”

Section: Introductionmentioning

confidence: 99%

Simulations of detonation wave propagation in rectangular ducts using a three-dimensional WENO scheme

Dou¹,

Tsai²,

Khoo³

et al. 2008

Combustion and Flame

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This paper reports high resolution simulations using a fifth-order weighted essentially non-oscillatory (WENO) scheme with a third-order TVD Runge-Kutta time stepping method to examine the features of detonation front and physics in square ducts. The simulations suggest that two and three-dimensional detonation wave front formations are greatly enhanced by the presence of transverse waves. The motion of transverse waves generates triple points (zones of high pressure and large velocity coupled together), which cause the detonation front to become locally overdriven and thus form "hot spots." The transversal motion of these hot spots maintains the detonation to continuously occur along the whole front in two and three dimensions. The present simulations indicate that the influence of the transverse waves on detonation is more profound in three dimensions and the pattern of quasisteady detonation fronts also depends on the duct size. For a "narrow" duct (4L × 4L where L is the half-reaction length), the detonation front displays a distinctive "spinning" motion about the axial direction with a well-defined period. For a wider duct (20L × 20L), the detonation front exhibits a "rectangular mode" periodically, with the front displaying "convex" and "concave" shapes one following the other and the transverse waves on the four walls being partly out-of-phase with each other.

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The propagation mechanism of cellular detonation

Cited by 14 publications

References 8 publications

High resolution numerical simulation of triple point collision and origin of unburned gas pockets in turbulent detonations

High resolution numerical simulation of triple point collision and origin of unburned gas pockets in turbulent detonations

Hydrodynamic Instabilities in Gaseous Detonations: Comparison of Euler, Navier–Stokes, and Large-Eddy Simulation

Simulations of detonation wave propagation in rectangular ducts using a three-dimensional WENO scheme

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