Flame propagation through aluminum particle cloud in a combustion tube

Chen, Zhihua; Fan, Baochun

doi:10.1016/j.jlp.2004.10.001

Cited by 45 publications

(17 citation statements)

References 16 publications

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“…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. Based on experimental results, theoretical and numerical models were developed to study Al dust detonation.…”

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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“…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]. Although the experimental results provide a research basis, information available from the experimental results is limited.…”

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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“…Note that injection and mixing of particles with the gas in experiments on detonation-wave suppression are performed before the moment of initiation (see, e.g., [4,12]). As a result, there is no need in rapid spraying of particles.…”

Section: Introductionmentioning

confidence: 99%

“…In [4], the gas jet was directed to the surface of a dust layer preliminary applied onto the tube wall. In [12], the gas flow from a high-pressure tank was injected into a tube through a chamber containing solid particles. In [19], the dust layer was preliminary applied onto the lower wall of the tube, after which it was injected into the volume by a compressed gas flow through capillaries connected to the tube walls from below.…”

Section: Introductionmentioning

confidence: 99%

Effect of chemically inert particles on parameters and suppression of detonation in gases

Fomin

Chen

2009

Combust Explos Shock Waves

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An algorithm for calculating the parameters of a steady one-dimensional detonation wave in mixtures of a gas with chemically inert particles and estimating the detonation-cell size in such mixtures is proposed. The calculated detonation parameters and cell size in stoichiometric hydrogen-oxygen mixtures with W, Al 2 O 3 , and SiO 2 particles are used to analyze the method of suppression of multifront gas detonation by injecting chemically inert particles ahead of the leading wave front. The ratio between the channel diameter and the detonation-cell size is used to estimate the limit of heterogeneous detonation in the mixtures considered. The minimum mass of particles and the characteristic cloud size necessary for detonation suppression are calculated. The effect of thermodynamic parameters of particles on the detonation suppression process is analyzed for the first time. Particles with a high specific heat and (if melting occurs) a high phase-transition heat are found to exert the most pronounced effect.

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Flame propagation through aluminum particle cloud in a combustion tube

Cited by 45 publications

References 16 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

Effect of chemically inert particles on parameters and suppression of detonation in gases

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