Burning velocities in fuel-rich aluminum dust clouds

Goroshin, Samuel; Fomenko, I.; Lee, J.H.S.

doi:10.1016/s0082-0784(96)80019-1

Cited by 107 publications

(94 citation statements)

References 7 publications

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“…At high gas temperatures, particles can also react efficiently in a kinetic regime without undergoing ignition [111], which means that the particle temperature remains close to the gas temperature and no micro-flames are formed [88,103,108,110]. High gas temperatures can be realized in self-propagating flame fronts that can be formed in relatively-dense suspensions of metal-powder fuels burning in air and other oxidizers [112,113].…”

Section: Combustion Of Metal-powder Suspensions Versus Single-particlmentioning

confidence: 99%

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Direct combustion of recyclable metal fuels for zero-carbon heat and power

et al. 2015

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Section: Combustion Of Metal-powder Suspensions Versus Single-particlmentioning

confidence: 99%

“…[113][114][115]. The resulting metal-fuel suspension exits the Bunsen burner, where the flame is stabilized through heat loss to the burner rim [101,116], as illustrated in Fig.…”

Section: Flames Burning Metal Fuelsmentioning

confidence: 99%

Direct combustion of recyclable metal fuels for zero-carbon heat and power

et al. 2015

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“…The burning velocity in the case of the purely diffusive regime is calculated using an expression given in [2,6] that requires two externally defined combustion parameters: the ignition temperature and combustion time of the single particle. Ignition temperatures at different particle sizes are calculated using the Semenov ignition criterion as shown in Fig.…”

Section: Comparison To Semi-empirical Flame Modelsmentioning

confidence: 99%

“…Unlike gas flames, the width of the flame reaction zone in particle suspensions can span a large temperature range and can be comparable to, or even exceed, that of the preheat zone [2]. The existence of diffusion micro-flames within a global flame-front (in effect, flames within the flame), which are insensitive to the bulk gas temperature, makes dust flames resistant to heat loss [1,3,4,5] and also serves to maintain a constant burning velocity with increasing fuel concentration in fuel-rich mixtures [6]. The ability of particles to ignite, together with low ignition temperatures, may result in much wider flame propagation limits for particle suspensions than for gaseous fuels.…”

Section: Introductionmentioning

confidence: 99%

Thermal structure and burning velocity of flames in non-volatile fuel suspensions

Soo

Kumashiro

Goroshin

et al. 2017

Proceedings of the Combustion Institute

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Flame propagation through a non-volatile solid-fuel suspension is studied using a simplified, time-dependent numerical model that considers the influence of both diffusional and kinetic rates on the particle combustion process. It is assumed that particles react via a single-step, first-order Arrhenius surface reaction with an oxidizer delivered to the particle surface through gas diffusion. Unlike the majority of models previously developed for flames in suspensions, no external parameters are imposed, such as particle ignition temperature, combustion time, or the assumption of either kinetic-or diffusion-limited particle combustion regimes. Instead, it is demonstrated that these parameters are characteristic values of the flame propagation problem that must be solved together with the burning velocity, and that the a priori imposition of these parameters from single-particle combustion data may result in erroneous predictions. It is also shown that both diffusive and kinetic reaction regimes can alternate within the same flame and that their interaction may result in non-trivial flame behavior. In fuel-lean mixtures, it is demonstrated that this interaction leads to certain particle size ranges where burning velocity increases with increasing particle size, opposite to the expected trend. For even leaner mixtures, the interplay between kinetic and diffusive reaction rates leads to the appearance of a new type of flame instability where kinetic and diffusive regimes alternate in time, resulting in a pulsating regime of flame propagation.

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“…Under very rich conditions, the §ame propagation is mainly governed by the combustion of small-size agglomerates and individual particles as their concentration becomes su©cient to consume the available oxygen. Experimental data on microparticle §ames available from the literature [3,4,10] are put in the Figure 4 Flame velocity vs. dust (particle) concentration for di¨erent Al particle sizes: 1 ¡ 250 nm (current study); 2 ¡ 6 µm (current study); 3 ¡ 6 µm [4]; 4 ¡ 6 µm [10]; and 5 ¡ 5 µm [3] same graph for comparison. The present data on the microparticle §ames are in agreement with the experimental data by Risha et al [4].…”

Section: Flame Propagation Velocitymentioning

confidence: 99%

Studies on the burning of micro- and nanoaluminum particle clouds in air

Bocanegra¹,

Sarou‐Kanian²,

Davidenko³

et al. 2009

Progress in Propulsion Physics

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An experimental study has been conducted to determine §ame propagation velocities in micro-(6 µm) and nanosized (250 nm) aluminum particle clouds for various concentrations in air. The experimental results show faster §ame propagation in nanoparticle cloud with respect to the microparticle §ame. Maximum §ame temperature has been measured using a high-resolution spectrometer operating in the visible range. Analysis of combustion residual shows that nanoparticle combustion is realized via the gaseous phase. A laminar §ame model has been proposed based on this observation. Model parameters have been derived by ¦tting the experimental results.

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Burning velocities in fuel-rich aluminum dust clouds

Cited by 107 publications

References 7 publications

Direct combustion of recyclable metal fuels for zero-carbon heat and power

Direct combustion of recyclable metal fuels for zero-carbon heat and power

Thermal structure and burning velocity of flames in non-volatile fuel suspensions

Studies on the burning of micro- and nanoaluminum particle clouds in air

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