Detonations in Gas-Particle Mixtures

Veyssiere, B.

doi:10.2514/1.18378

Cited by 15 publications

(3 citation statements)

References 22 publications

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“…The combustion rate of solid particles is much slower than that of homogeneous gaseous reactions, often by one or several orders of magnitude, because it is always limited by the slow diffusion rates of reactants and products in the adjacent zone of the burning particle as well as by some slow surface chemical reactions [3,4,8,13,14]. Therefore, in solid particle combustion modeling, the combustion process is always divided into two steps.…”

Section: Particle Combustion Modelmentioning

confidence: 99%

Application of CE/SE method to gas-particle two-phase detonations under an Eulerian-Lagrangian framework

Zhang

Wen

Liu

et al. 2019

Journal of Computational Physics

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This study aims to extend the original Eulerian space-time conservation element and solution element (CE/SE) method to the Eulerian-Lagrangian framework to solve the gasparticle two-phase detonation problems. The gas-aluminum particle two-phase detonations are numerically investigated by the developed Eulerian-Lagrangian code, in which the gas-phase compressible Euler equations are solved by our in-house CE/SE scheme based on quadrilateral meshes. Additionally, the particle-phase Lagrangian equations, together with the stiff source terms of interphase interactions and chemical reactions, are explicitly integrated via the operator-splitting technique. A dynamic data structure is introduced to store particle information to overcome the tremendous communication costs when applying message passing interface parallel to the Eulerian-Lagrangian framework. The code is shown to be of better parallel efficiency in moderate-scale computations than that uses static arrays. Comparisons with previous one-dimensional and two-dimensional simulation results and experimental observations are conducted to demonstrate the accuracy and reliability of the developed Eulerian-Lagrangian CE/SE code in gas-particle two-phase detonation simulations. Moreover, the code is also applied to simulate polydisperse gas-particle detonations which is close to a realistic scenario, and significant differences in detonation characteristics are found when compared with the monodisperse counterparts. The great demands of using the Eulerian-Lagrangian method to obtain more physics-consistent gas-particle detonation results are addressed, which the traditional Eulerian-Eulerian simulations fail to observe.

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Section: Particle Combustion Modelmentioning

confidence: 99%

Application of CE/SE method to gas-particle two-phase detonations under an Eulerian-Lagrangian framework

Zhang

Wen

Liu

et al. 2019

Journal of Computational Physics

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“…Dispersion of a dense gas–solid mixture due to interaction with a shock wave has importance to a variety of engineering applications, such as such as heterogenous detonations (Zhang et al. 2001), pulsed detonation engines (Chang & Kailasanath 2003; Vessiere 2006), mining safety (Merzkirch & Bracht 1978) and rocket propulsion (Davis et al. 2013).…”

Section: Introductionmentioning

confidence: 99%

“…Dispersion of a dense gas-solid mixture due to interaction with a shock wave has importance to a variety of engineering applications, such as such as heterogenous detonations (Zhang et al 2001), pulsed detonation engines (Chang & Kailasanath 2003;Vessiere 2006), mining safety (Merzkirch & Bracht 1978) and rocket propulsion (Davis et al 2013). Gas-solid mixtures in this regime lie within a range of volume fractions (ϕ p ) between ∼1 and 50 %, where ϕ p is defined as the volume of the solid particles in the mixture, divided by the total volume of the mixture (Zhang et al 2001;Regele et al 2014;Goetsch & Regele 2015;Sweeney & Valentine 2017).…”

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confidence: 99%

Improved scaling laws for the shock-induced dispersal of a dense particle curtain

et al. 2019

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Experiments were performed within Sandia National Labs’ Multiphase Shock Tube to measure and quantify the shock-induced dispersal of a shock/dense particle curtain interaction. Following interaction with a planar travelling shock wave, schlieren imaging at 75 kHz was used to track the upstream and downstream edges of the curtain. Data were obtained for two particle diameter ranges ($d_{p}=106{-}125$, $300{-}355~\unicode[STIX]{x03BC}\text{m}$) across Mach numbers ranging from 1.24 to 2.02. Using these data, along with data compiled from the literature, the dispersion of a dense curtain was studied for multiple Mach numbers (1.2–2.6), particle sizes ($100{-}1000~\unicode[STIX]{x03BC}\text{m}$) and volume fractions (9–32 %). Data were non-dimensionalized according to two different scaling methods found within the literature, with time scales defined based on either particle propagation time or pressure ratio across a reflected shock. The data show that spreading of the particle curtain is a function of the volume fraction, with the effectiveness of each time scale based on the proximity of a given curtain’s volume fraction to the dilute mixture regime. It is seen that volume fraction corrections applied to a traditional particle propagation time scale result in the best collapse of the data between the two time scales tested here. In addition, a constant-thickness regime has been identified, which has not been noted within previous literature.

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