Analysis of transient combustion with the use of contemporary CFD techniques

Bykov, Viatcheslav; Киверин, А. Д.; Koksharov, Andrey; Yakovenko, I. S.

doi:10.1016/j.compfluid.2019.104310

Cited by 25 publications

(10 citation statements)

References 49 publications

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“…The governing Equations ( 1)-( 7) were integrated via the second-order predictor/corrector method described in [32]. To perform mathematical modeling of low-Mach gasdynamics we implemented algorithms described in [32] in the in-house code, which was thoroughly tested and validated previously on a vast variety of gas dynamics and combustion problems [11,33]. The computational mesh cell size was equal to ∆x = 0.2 mm, the overall amount of cells was 45,000.…”

Section: Methodsmentioning

confidence: 99%

Experimental and Numerical Study of Gas Injection Effect on the Methane–Air Combustion inside a Coaxial Burner

Киверин

Kichatov

Korshunov

et al. 2021

Fluids

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This paper is devoted to the analysis of the effect of gas injection on the efficiency of gaseous fuel burning. A coaxial burner with a perforated inner wall is presented in which the methane–air acceleration is observed. With the use of numerical analysis, it is demonstrated that the flame acceleration is related to the flow separation from the inner wall that, in turn, leads to the reduction in heat losses to the wall as well as to vortex formation and reduction in momentum losses. On the basis of the obtained results, a new technology of efficient burning of gaseous fuels can be proposed with the use of gas and/or liquid fuel injection.

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Section: Methodsmentioning

confidence: 99%

Experimental and Numerical Study of Gas Injection Effect on the Methane–Air Combustion inside a Coaxial Burner

Киверин

Kichatov

Korshunov

et al. 2021

Fluids

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“…The characteristic decomposition method underlying the CABARET technique allows for a straightforward description of the inflow and outflow boundary conditions via the relationships between characteristics. Recently, this numerical technique was adopted by several authors for the numerical analysis of combustible systems, and they showed its usefulness in solving the problems of reactive gas dynamics [ 25 , 26 , 27 ]. In particular, the chosen numerical technique is thoroughly validated for hydrogen–air flames in [ 25 ].…”

Section: Problem Setupmentioning

confidence: 99%

“…Recently, this numerical technique was adopted by several authors for the numerical analysis of combustible systems, and they showed its usefulness in solving the problems of reactive gas dynamics [ 25 , 26 , 27 ]. In particular, the chosen numerical technique is thoroughly validated for hydrogen–air flames in [ 25 ]. Moreover, it reproduces the non-steady effects in flame development well and predicts with high accuracy such a phenomenon as the deflagration-to-detonation transition [ 27 ] (the calculations agree well with the available experimental data).…”

Section: Problem Setupmentioning

confidence: 99%

On the Critical Condition for Flame Acceleration in Hydrogen-Based Mixtures

2023

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The paper presents a novel numerical approach to the quantitative estimation of the concentration limits for flame acceleration in hydrogen-based mixtures. A series of calculations are carried out for hydrogen–air and hydrogen–oxygen flames in channels. The analysis of the obtained numerical results provided the value of 11 ± 0.25 % hydrogen content in the mixture as a lean concentration limit of flame acceleration that agrees well with the available experimental data. Moreover, the basic physical mechanism responsible for the transition from the steady mode of flame propagation to the accelerated one is distinguished. The mechanism is related to flame stretching in the region of interaction with the boundary layer and the competition between the joint increase in burning rate and heat losses. The novel technique for the estimation of concentration limits of flame acceleration presented here can be applied to assess combustion conditions inside combustors of energy and propulsion systems fed with hydrogen. The results are also useful in estimating explosion and fire risks in hydrogen storage, transport, and utilization facilities as parts of hydrogen energy and propulsion systems.

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“…The combustion reaction is an important branch of chemical reaction, and combustion reactions are composed of complex thermal and chemical processes, which are often coupled to varying degrees. Although the continuous fluid hypothesis has always been the basis of most theoretical and numerical studies in the field of combustion, the physical principles of combustion still rely on molecular processes, such as diffusion and chemical reactions. − Especially for the combustion process of ramjet engines, more microscale molecular dynamics information is needed to describe the shock waves, thermal nonequilibrium, and chemical reactions caused by high-speed incoming gases. − …”

Section: Introductionmentioning

confidence: 99%

“…Among hydrocarbon fuels, hydrogen and methane are generally the most commonly used fuels. As a commonly used fuel, there have been many studies and applications of the combustion mechanism and computational fluid dynamics (CFD) simulation of hydrogen. ,,,− Indeed, the elementary reaction of H 2 combustion is the core part of the description of the combustion mechanism of all hydrocarbons and oxygenated hydrocarbon fuels. In addition to using reaction kinetic mechanisms based on rate constants of the elementary reaction to consider chemical reactions in hydrogen combustion, DSMC, DMS, and reactive force field-based molecular dynamics (MD) methods have also been used in the process of hydrogen combustion.…”

Section: Introductionmentioning

confidence: 99%

Molecular Dynamics Simulation of Thermal Nonequilibrium and Chemical Reaction Processes in Hydrogen Combustion

Wu,

Hu,

et al. 2024

J. Phys. Chem. A

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Using reactive force field (ReaxFF) and molecular dynamics simulation, we investigate the combustion process of hydrogen−oxygen systems in initial thermal nonequilibrium states with different translational and rovibrational temperatures for oxygen. The system studied in this work contains 300 oxygen molecules and 700 hydrogen molecules with a density of 7 times the air density. For this system, the characteristic relaxation times of oxygen and hydrogen vibrational energies are 0.173 and 0.249 ns, respectively. 0.6% of hydrogen undergoes a chemical reaction with oxygen during the thermal nonequilibrium relaxation stage. For the distribution of translational energy and vibrational energy of oxygen in the thermal nonequilibrium state, the maximum mean error of the statistical distribution in the simulation and the Boltzmann distribution at temperature calculated from the average kinetic energy of molecules is about 2.25 × 10 −5 . At the same time, it was observed in the simulation that many-body interactions play a certain role in the combustion process. Furthermore, we compare the ignition time and temperature rise behavior of different combustion mechanisms and molecular dynamics simulations starting from the thermal equilibrium state. These results will provide meaningful references for the construction of thermal nonequilibrium combustion chemical reaction mechanisms.

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Analysis of transient combustion with the use of contemporary CFD techniques

Cited by 25 publications

References 49 publications

Experimental and Numerical Study of Gas Injection Effect on the Methane–Air Combustion inside a Coaxial Burner

Experimental and Numerical Study of Gas Injection Effect on the Methane–Air Combustion inside a Coaxial Burner

On the Critical Condition for Flame Acceleration in Hydrogen-Based Mixtures

Molecular Dynamics Simulation of Thermal Nonequilibrium and Chemical Reaction Processes in Hydrogen Combustion

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