Combustion onset in non-uniform dispersed mixtures

Смирнов, Н.Н.; Никитин, В. Ф.; Dushin, V.R.; Filippov, Yurii G.; Nerchenko, V.A.; Khadem, Javad

doi:10.1016/j.actaastro.2015.04.021

Cited by 119 publications

(14 citation statements)

References 12 publications

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“…The first approach, Eulerian-Lagrangian approach, is based on the continuous-discrete representation of a two-phase mixture. The equations of continuum mechanics for carrier phase are complemented by a system of ordinary differential equations describing the movement path and the change in temperature of each particle [6][7][8]. In the second approach, Eulerian-Eulerian approach, simulation is carried out within the framework of models of interpenetrating continua mechanics.…”

Section: Mathematical Modelmentioning

confidence: 99%

“…The use of experimental methods for studying the interaction of shock waves with elements of an aircraft, as well as the occurrence or, on the contrary, the suppression of detonation waves is hampered due to the danger of structures destruction and high speed of the flow, therefore the development of numerical methods is of urgent interest. Computational technologies allow obtaining and visualizing detailed two-and three-dimensional flow patterns, identifying both local features and integral properties of the processes [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

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Interaction of a shock wave with an array of particles and effect of particles on the shock wave weakening

et al. 2017

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Two-phase systems that involve gas-particle or gas-droplet flows are widely used in aerospace and power engineering. The problems of weakening and suppression of detonation during saturation of a gas or liquid flow with the array of solid particles are considered. The tasks, associated with the formation of particles arrays, dust lifting behind a travelling shock wave, ignition of particles in high-speed and high-temperature gas flows are adjoined to safety of space flight. The mathematical models of shock wave interaction with the array of solid particles are discussed, and numerical methods are briefly described. The numerical simulations of interaction between sub-and supersonic flows and an array of particles being in motionless state at the initial time are performed. Calculations are carried out taking into account the influence that the particles cause on the flow of carrier gas. The results obtained show that inert particles significantly weaken the shock waves up to their suppression, which can be used to enhance the explosion safety of spacecrafts.

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Section: Mathematical Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Interaction of a shock wave with an array of particles and effect of particles on the shock wave weakening

et al. 2017

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“…Interaction of a laser pulse with gas-droplet mixtures plays an important role in the design and improvement of propulsive characteristics of pulse detonation engines [1][2][3][4]. Laser propulsion using water droplets as a propellant is considered to have a wide range of future aerospace applications [5].…”

Section: Introductionmentioning

confidence: 99%

Numerical simulation of optical breakdown in a liquid droplet induced by a laser pulse

2018

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Please cite this article as: P.V. Bulat, O.P. Minin, K.N. Volkov, Numerical simulation of optical breakdown in a liquid droplet induced by a laser pulse, Acta Astronautica (2017), AbstractModelling and simulation of interaction of laser pulse with individual liquid droplets are of crucial importance in terms of development and code coupling for simulation of laser propulsion and detonation in gas-droplet systems. These applications are challenging and complex for many reasons, one among them is the disparate time and length scales that are required to resolve for an accurate physical representation of the problem. The injection of liquid droplets with low evaporation temperature causes optical breakdown on the individual droplet and leads to a drop of the minimum pulse energy of detonation in the gas-droplet mixture. The mathematical models of various stages of the optical breakdown on individual droplet and numerical methodology for computer modelling of the laser-induced breakdown are developed. Sub-models of optical breakdown on liquid droplet include droplet heating to boiling temperature, its evaporation and formation of vapor aureole around the droplet, ionization of vapor aureole and development of electron avalanche, appearance of microplasma spots and their expansion, propagation of shock wave inside the droplet and in the surrounding gas. The threshold intensity of optical breakdown on individual water droplet and its dependence on droplet radius, location of droplet, total energy and radius of laser pulse are studied.

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“…The particulate phase is simulated through a Lagrangian deterministic or stochastic tracking models to provide particle trajectories [12][13][14]18]. The virtual mass and Basset forces due to their small magnitudes, and the Magnus force due to lack of knowledge about particle angular momentum are neglected.…”

Section: Particulate Phasementioning

confidence: 99%

“…3 Two-phase flows with inert and burning aluminum particles as well as the influence of particles on acoustic oscillations in the combustion chamber are considered in [2,[12][13][14][15], where the results of numerical simulations based on the Eulerian-Eulerian and Eulerian-Lagrangean approaches and some experimental results are reported.…”

Section: Introductionmentioning

confidence: 99%

Pressure oscillations and instability of working processes in the combustion chambers of solid rocket motors

et al. 2017

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Cite this article as: V.N. Emelyanov, I.V. Teterina, K.N. Volkov and A.U. Garkushev, Pressure oscillations and instability of working processesin the combustion chambers of solid rocket motors, Acta Astronautica, http://dx.doi.org/10. 1016/j.actaastro.2016.09.029 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. AbstractMetal particles are widely used in space engineering to increase specific impulse and to supress acoustic instability of intra-champber processes. A numerical analysis of the internal injection-driven turbulent gas-particle flows is performed to improve the current understanding and modeling capabilities of the complex flow characteristics in the combustion chambers of solid rocket motors (SRMs) in presence of forced pressure oscillations. The two-phase flow is simulated with a combined Eulerian-Lagrangian approach. The Reynolds-averaged Navier-Stokes equations and transport equations of -model are solved numerically for the gas. The particulate phase is simulated through a Lagrangian deterministic and stochastic tracking models to provide particle trajectories and particle concentration. The results obtained highlight the crucial significance of the particle dispersion in turbulent flowfield and high potential of statistical methods. Strong coupling between acoustic oscillations, vortical motion, turbulent fluctuations and particle dynamics is observed.

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Combustion onset in non-uniform dispersed mixtures

Cited by 119 publications

References 12 publications

Interaction of a shock wave with an array of particles and effect of particles on the shock wave weakening

Interaction of a shock wave with an array of particles and effect of particles on the shock wave weakening

Numerical simulation of optical breakdown in a liquid droplet induced by a laser pulse

Pressure oscillations and instability of working processes in the combustion chambers of solid rocket motors

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