DDT and detonation waves in dust-air mixtures

Zhang, F.; Grönig, Hans; Ven, A. van de

doi:10.1007/pl00004060

Cited by 56 publications

(29 citation statements)

References 13 publications

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“…Borisov et al [8] examined the role of particle dimensions and noted that the parameters velocity and the pressure depend on the minimum particle scale. Zhang et al [9] investigated transverse waves in dusty detonations and calculated, using a detonation model, the minimum tube diameter for generating detonation. Moreover, the flame acceleration [10] and deflagration to detonation transition [11] in the Al suspended mixtures are also studied experimentally.…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Tulis and Selman [4] studied Al dust detonations for flake and spherical particles and found out that this kind of detonation is very sensitive to the specific area. Zhang et al [5] investigated transverse waves in dusty detonations and calculated, using a detonation model, the minimum tube diameter for generating detonation. Flame acceleration and deflagration to detonation transition in the Al suspended mixtures have been studied experimentally [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Effects of different product phases in aluminum dust detonation modeling

Teng

Jiang

2013

Sci. China Phys. Mech. Astron.

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Modeling aluminum (Al) dust detonation is difficult due to uncertainties in the product species and fractions. Recent experiments indicate both gaseous and solid alumina may appear in the detonation product, but only the gaseous one was considered before. To resolve this drawback, we study the effects of different product phases on the detonation parameters with the hybrid combustion model proposed recently. Numerical results demonstrate that the assumption of gaseous product induces high velocity and pressure, while the assumption of solid product induces low velocity and pressure. To clarify how close-to-experiment results have been obtained with one phase assumption, we revisit previous studies and analyze the models. The inconsistency between the product phase and heat release is found, and then one model with variable heat release dependent on the product phase is proposed. Then simulations with both the gaseous and solid products are carried out, and results reveal the necessity of establishing a relationship between the heat release and reaction products. Re s = two-phase Reynolds number t= time, s T= gas temperature, K T p =particle temperature, K u= gas velocity, m/s u p = particle velocity, m/s W i =molecular weight, g/mol x= distance, m = thermal conductivity of gas, W/(m·K) = bulk density of particle, kg/m 3  = dynamic viscosity coefficient, kg/(m·s) Teng H H, et al. Sci China-Phys Mech Astron November (2013) Vol. 56 No. 11 2179 v i = stoichiometric coefficient  = gas or particle density, kg/m 3

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“…Particle sizes ranging from 0.1 microns to 100 microns were investigated and the optimal size of Al particles was found to be about 40 microns [6]. A suspension in air of micron size Al particles supported a detonation wave in tubes [7,8]. Initiation of detonation was investigated in an explosively generated cloud of Al particles (atomized H-2 Al and Àaked Al) using 8 kg C4 explosive and detonation was observed only in the Àaked Al with 4-8 MPa peak pressures [9].…”

Section: Introductionmentioning

confidence: 99%

Dynamic behavior of particulate/porous energetic materials

Nesterenko

Chiu

Braithwaite³

et al. 2012

AIP Conference Proceedings

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Abstract. Dynamic behavior of particulate/porous energetic materials in a broad range of dynamic conditions (low velocity impact and explosively driven expansion of rings) is discussed. Samples of these materials were fabricated using Cold Isostatic Pressing and Hot Isostatic Pressing with and without vacuum encapsulation. The current interest in these materials is due to the combination of their high strength and output of energy under critical conditions of mechanical deformation. They may exhibit high compressive and tensile strength with the ability to undergo bulk distributed fracture resulting in small size reactive fragments. The mechanical properties of these materials and the fragment sizes produced by fracturing are highly sensitive to mesostructure. For example, the dynamic strength of Al-W composites with fine W particles is significantly larger than the strength of composites with coarse W particles at the same porosity. The morphology of W inclusions had a strong effect on the dynamic strength and fracture pattern. Experimental results are compared with numerical data.

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DDT and detonation waves in dust-air mixtures

Cited by 56 publications

References 13 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

Effects of different product phases in aluminum dust detonation modeling

Dynamic behavior of particulate/porous energetic materials

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