Clusterization of particles in turbulent and vortex two-phase flows

Varaksin, A. Yu.

doi:10.1134/s0018151x14050204

Cited by 66 publications

(3 citation statements)

References 94 publications

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“…In addition to the emission of harmful substances, there are also condensation trails formed in the cruise fl ight at high altitudes. The results of some researches show that condensation trails destroy the radiation balance between the atmosphere and ground surface (Varaksin, 2013(Varaksin, , 2014 leading to a change in air fl ows, causing atmosphere stratifi cation (Burtsev and Leontiev, 2014), and initiating the formation of cirrus clouds -the main factor of the greenhouse effect (Dedesh et al, 2006). The GTE development suggests an increase in the engine thrust.…”

Section: Environmental Problems and Regulation Of The Emissions Of Hamentioning

confidence: 99%

Multinozzle Combustion Chamber of Aviation Gas Turbine Engines as a Basis of Environmental Safety. Review

Biryuk

Gorshkalev

Lukachev

et al. 2016

Inter J Ener Clean Env

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Environmental safety of aviation engines is a very important problem for designers. The importance of this problem increases with the aviation engine thrust, because of the increase in such thermodynamic parameters as the temperature and pressure in the combustion chamber. In this case, the rise of temperature in the combustion zone results in the formation of NO x. Using the multinozzle fuel burning mode in the combustion chamber will make it possible to decrease the formation of harmful substances signifi cantly. Multinozzle combustion chambers of aviation gas turbine engines designed by the JSC "Kuznetsov" (Samara City, Russian Federation) in the course of the few last decades comply with the current requirements imposed on emissions. Comparative ecological characteristics of widespread aviation engines are presented in the article. The results of procedures of environmental testing of low-emission multinozzle combustion chambers for aviation gas turbine engines are described. It is shown that a multinozzle combustion chamber provides low NO x pollutant emissions and high reliability of aviation engine operation in diff erent operating conditions.

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Section: Environmental Problems and Regulation Of The Emissions Of Hamentioning

confidence: 99%

Multinozzle Combustion Chamber of Aviation Gas Turbine Engines as a Basis of Environmental Safety. Review

Biryuk

Gorshkalev

Lukachev

et al. 2016

Inter J Ener Clean Env

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“…The formation of clusters (compact flow regions with an increased concentration of the dispersed phase, surrounded by flow zones with a low concentration) is one of the phenomena caused by the interaction of particles with turbulent eddies. Particle clustering (preferential concentration) is observed in various physical processes, leading, in particular, to an increase in the particle settling rate and the frequency of their coagulation [9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Direct Numerical Simulation of Fully Developed Turbulent Gas–Particle Flow in a Duct

Emel’yanov¹,

Volkov²

2022

Nelin. Dinam.

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Direct numerical simulation of a fully developed turbulent flow of a viscous compressible fluid containing spherical solid particles in a channel is carried out. The formation of regions with an increased concentration of solid particles in a fully developed turbulent flow in a channel with solid walls is considered. The fluid flow is simulated with unsteady three-dimensional Navier – Stokes equations. The discrete trajectory approach is applied to simulate the motion of particles. The distributions of the mean and fluctuating characteristics of the fluid flow and distribution of the concentration of the dispersed phase in the channel are discussed. The formation of regions with an increased concentration of particles is associated with the instantaneous distribution of vorticity in the near-wall region of the channel. The results of numerical simulation are in qualitative and quantitative agreement with the available data of physical and computational experiments.

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“…Attempts to provide a multi-scale mathematical description of nanoparticle formation that would consider micro-and macroscale processes, as well as their mutual interaction, have failed to produce an appropriate description of nucleation, particularly at its early stage, largely due to the reliance on the thermodynamic model [8][9][10].…”

Section: Introductionmentioning

confidence: 99%

Statistical analysis of homogeneous nucleation of metallic nanoparticles during gas-phase synthesis

Коренченко

Гельчинский²,

Vorontsov³

2020

J. Phys.: Condens. Matter

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In this work, we set out to develop a model of gas-phase nucleation in a mixture of copper and argon atoms, which can be further used for analysing macro-systems. Processes occurring at the atomic level are described using coefficients obtained by statistical analysis of molecular dynamic (MD) data on interactions of metal clusters with metal and argon atoms. The MD simulation results are compared with those obtained using the proposed macroscopic model. It is found that the coefficients obtained by averaging the interaction data suitably represent the integral value of the heat of condensation, although result in the smoothing of the energy distribution functions of the clusters. Analysis of the evolution of the number of clusters has shown that the values of their increase rate were lower than those obtained by MD simulation. The conclusion is made, that in order to improve the precision of the developed gas-phase condensation model, it should be supplemented by cluster coagulation.

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Clusterization of particles in turbulent and vortex two-phase flows

Cited by 66 publications

References 94 publications

Multinozzle Combustion Chamber of Aviation Gas Turbine Engines as a Basis of Environmental Safety. Review

Multinozzle Combustion Chamber of Aviation Gas Turbine Engines as a Basis of Environmental Safety. Review

Direct Numerical Simulation of Fully Developed Turbulent Gas–Particle Flow in a Duct

Statistical analysis of homogeneous nucleation of metallic nanoparticles during gas-phase synthesis

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