Detailed structure of spinning detonation in a circular tube

Tsuboi, Nobuyuki; Eto, Keitaro; Hayashi, A. Koichi

doi:10.1016/j.combustflame.2006.12.004

Cited by 54 publications

(17 citation statements)

References 31 publications

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“…Therefore both the gas and solid specie properties change in a wide range. In the gaseous detonation research, the detailed chemical reaction model has been used with the realistic gas specie properties widely [33,34]. In the Al detonation research before, the simplified model is used and the heat capacity of the solid particle is set to be a constant.…”

Section: Realistic Heat Capacity Methodsmentioning

confidence: 99%

Numerical simulation of one-dimensional aluminum particle–air detonation with realistic heat capacities

Teng

Jiang²

2013

Combustion and Flame

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a b s t r a c t Aluminum (Al) particle-air detonation is very complicated because it includes multi-phase combustion phenomenon. Thus numerical simulations are often over-simplified. Here, the detonation is simulated by solving one-dimensional equations with more realistic heat capacities that vary with the dust mixture temperature. The effect on detonation parameters from the realistic heat capacities for the solid particles is investigated with a hybrid combustion model. The calculated results indicate that the detonation pressure, temperature and velocity vary significantly with changes in the heat capacity. Except for the velocity, these parameters are overestimated in numerical simulations when a constant heat capacity of the pre-shock mixtures is used. Furthermore, the realistic heat capacities have a strong effect on small diameter particles, but a weak effect on large diameter particles. Thus, when constant heat capacities are used, the combustion characteristic lengths are a function of the particle diameters with a power dependence of 1.77, whereas the power dependence decreases to 1.49 when realistic heat capacities are used. Moreover, if realistic heat capacities are applied, an ''abnormal'' strong detonation wave may appear in a dust mixture having large diameter particles. This phenomenon is consistent with the current combustion model, but it indicates that the value of heat released should also vary with the gas temperature in a fashion similar to that of the heat capacities.

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Section: Realistic Heat Capacity Methodsmentioning

confidence: 99%

Numerical simulation of one-dimensional aluminum particle–air detonation with realistic heat capacities

Teng

Jiang²

2013

Combustion and Flame

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“…Fedkiw et al, 1 Oran et al, 2 Hu et al, 3 Wang et al, 4 Walter and da Silva, 5 He and Karagozian, 6 Aslam and Powers, 7 or Tsuboi et al 8 However, there are indications that such an assumption can be problematic. For example, using grid sizes around 10 −6 m for their threedimensional simulations of unsteady H 2 -air detonations, Tsuboi et al report wave dynamics that show strong sensitivity to the fineness of the grid.…”

Section: Introductionmentioning

confidence: 99%

The Dynamics of Unsteady Detonation with Diffusion

Aslam

Romick

Powers

2011

49th AIAA Aerospace Sciences Meeting Including the New Horizons Forum and Aerospace Exposition

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The dynamics of one-dimensional detonations predicted by a one-step irreversible Arrhenius kinetic model with the inclusion of mass, momentum, and energy diffusion were investigated. A series of calculations in which activation energy is varied, holding the length scales of diffusion and reaction constant, was performed. As in the inviscid case, as the activation energy increases, the system goes through a period-doubling process and eventually undergoes a transition to chaos. Within the chaotic regime, there exist regions of low frequency limit cycles. An approximation to Feigenbaum's constant, the rate at which bifurcation points converge, is obtained. The addition of diffusion significantly delays the onset of instability and strongly influences the dynamics in the unstable regime. Because the selected reaction and viscous length scales are representative of real physical systems, the common use of reactive Euler equations to predict detonation dynamics in the unstable and marginally stable regimes is called into question; reactive Navier-Stokes may be a more appropriate model in such regimes.

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“…The thermodynamic properties are calculated as polynomial functions of temperature based on the JANAF table, 11) and their coefficients in the range between 100 and 5000 K are obtained by the least squares method. The details of the numerical method are written in Tsuboi et al 12) 3.2. Numerical grid systems and simulation conditions Figure 1 shows the present computational grid systems.…”

Section: Governing Equations and Numerical Methodsmentioning

confidence: 99%

Numerical Study and Performance Evaluation for a Pulse Detonation Engine with an Exhaust Nozzle (1st Report: Estimation on Performance using a Detailed Reaction Model)

Kimura

Tsuboi

Hayashi

et al. 2012

Trans. Japan Soc. Aero. S Sci.

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This paper presents a propulsive performance evaluation for a H 2 /Air pulse detonation engine (PDE) equipped with a converging-diverging exhaust nozzle. The evaluation was conducted using system-level modeling and multi-cycle numerical simulations. This study discusses two-dimensional and axisymmetric compressible Euler equations with a detailed chemical reaction model. First, the single-shot propulsive performance of a simplified-PDE (i.e., no exhaust nozzle) is evaluated to show the validity of the numerical and performance evaluation method. The influences of the initial conditions, ignition energy, grid resolution and scale effects on the propulsive performance are studied using multi-cycle simulations.

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Detailed structure of spinning detonation in a circular tube

Cited by 54 publications

References 31 publications

Numerical simulation of one-dimensional aluminum particle–air detonation with realistic heat capacities

Numerical simulation of one-dimensional aluminum particle–air detonation with realistic heat capacities

The Dynamics of Unsteady Detonation with Diffusion

Numerical Study and Performance Evaluation for a Pulse Detonation Engine with an Exhaust Nozzle (1st Report: Estimation on Performance using a Detailed Reaction Model)

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