Персона:
Власов, Павел Александрович

Организационные подразделения

Организационная единица

Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

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Власов

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Павел Александрович

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Теперь показываю 1 - 10 из 12

Только метаданные
Diagnostics of plasma formed during the oxidation of hydrocarbons in shock waves by electric probes with a conductive and dielectric surface
(2021) Smirnov, V. N.; Malyshev, N. S.; Mikhailov, D. I.; Agafonov, G. L.; Vlasov, P. A.; Власов, Павел Александрович
© 2021 Institute of Physics Publishing. All rights reserved.Experiments were carried out behind shock waves with recoding the electric current flowing through cylindrical probes with a conductive and dielectric surface under a negative (- 9V) potential relative to the walls of the shock tube, with the displacement and total currents measured, respectively. Simultaneously, the signals of chemiluminescent emission from electronically excited OH* (λ = 308 nm) and CH* (λ = 430 nm) radicals were recorded. Experiments were carried out with various lean mixtures of methane and acetylene with oxygen diluted in argon. Preliminary calculations were performed using a theoretical model of an electric probe with a dielectric and conducting surface. Simulations showed that the displacement current on a probe under a negative potential with a dielectric surface is controlled by the chemical ionization rate, the surface area of the probe, and the electric potential. A close correlation was observed between the times of reaching the maximum of the probe current and the maximum of the chemiluminescent emission signals from the electronically excited OH* and CH* radicals.
Только метаданные
INFLUENCE OF CO AND CO2 ADDITIVES ON SYNGAS FORMATION DURING STEAM CONVERSION OF METHANE FROM BIOMASS GASIFICATION PRODUCTS
(2024) Akhunyanov, A. R.; Vlasov, P. A.; Smirnov, V. N.; Arutyunov, A. V.; Власов, Павел Александрович
Только метаданные
Oxygen-Free Reforming of Methane into Synthesis Gas in the Presence of H2, H2O, CO, and CO2 Additives Taking into Account the Formation of Soot Particles
(2024) Akhunyanov,A.R.; Vlasov,P.A.; Smirnov,V.N.; Arutyunov,A.V.; Власов, Павел Александрович
Открытый доступ
Emission of CH∗ and C 2 ∗ during the high-temperature oxidation of propane in reflected shock waves
(2019) Tereza, A. M.; Smirnov, V. N.; Shumova, V. V.; Nazarova, N. V.; Vlasov, P. A.; Garmash, A. A.; Власов, Павел Александрович; Гармаш, Александр Александрович
© 2019 Published under licence by IOP Publishing Ltd. The autoignition of a stoichiometric propane-oxygen mixture diluted with argon was studied behind reflected shock waves in the temperature range of 1230-1700 K at the total concentration of [M] 50 ∼ 10 -5 mol/cm 3 . Emission signals from electronically excited CH∗ (at λ = 429 nm) and C 2 ∗ (at λ = 516 nm) radicals were recorded. It was found that the CH∗ and C 2 ∗ emission time profiles reached their maxima almost simultaneously over the entire temperature range covered. The temperature dependence of the ignition delay time measured from the time of reaching the maximum by the CH∗ emission signal was simulated within the framework of several published data kinetic mechanisms. It was found that, at temperatures below 1400 K, all the kinetic models tested predict ignition delay times severalfold longer than that experimentally observed. Using a sensitivity analysis to the reaction rate constants in the induction period, the main reactions that affect the ignition delay time were identified.
Открытый доступ
An experimental and simulation study of the effect of acetone and propane additives on soot formation in acetylene pyrolysis behind reflected shock waves
(2019) Agafonov, G. L.; Smirnov, V. N.; Tereza, A. M.; Shumova, V. V.; Vlasov, P. A.; Garmash, A. A.; Власов, Павел Александрович; Гармаш, Александр Александрович
© 2019 Published under licence by IOP Publishing Ltd. Experimental investigations and detailed kinetic simulations of the formation of soot particles during pyrolysis of mixtures of acetylene with acetone and propane behind reflected shock waves are performed. Acetone and propane additives are found to substantially promote the process of soot formation as compared with that in acetylene-argon mixtures. Detailed kinetic simulations closely reproduce our own experimental results and published data. The kinetic model of soot formation is comprised of 4782 direct and reverse reactions involving 372 species. The predictive possibility of the kinetic model of soot formation is tested by describing the effect of acetone and propane additives to acetylene-argon mixtures on soot formation. All the kinetic parameters of the unified kinetic model are kept constant. The indicated additives enhance the soot yield because polyyne-dominated pathway of soot nucleation, characteristic of unseeded acetylene-argon mixtures, is augmented by the aromatic pathway, typical of most hydrocarbons.
Открытый доступ
Shock-tube study of the formation of iron, carbon, and iron–carbon binary nanoparticles: experiment and detailed kinetic simulations
(2019) Agafonov, G. L.; Smirnov, V. N.; Tereza, A. M.; Zhiltsova, I. V.; Vlasov, P. A.; Mikhailov, D. I.; Власов, Павел Александрович
© 2018 Taylor & Francis An experimental and computational study of the formation of pure iron nanoparticles, carbon nanoparticles (soot), and binary carbon-coated iron nanoparticles during the pyrolysis of iron pentacarbonyl–argon, ethylene–argon, and iron pentacarbonyl–ethylene–argon mixtures, respectively, behind reflected shock waves is carried out. The shape and size distribution of these nanoparticles are examined on a Zeiss Ultra plus ultrahigh-resolution field-emission scanning electron microscope. The binary iron–carbon particles were also investigated by high-resolution transmission electron microscopy and high-angle annular dark-field imaging (HAADF STEM) on a FEI Osiris transmission electron microscope equipped with a Bruker SuperX detector. Detailed kinetic simulations of the formation of these three types of particles are performed, which predict the concentration, average size, and size distribution of particles.
Только метаданные
Two-route formation of soot nuclei: experimental and modeling evidence
(2024) Busillo, E.; Vlasov, P. A.; Smirnov, V. N.; Mikhailov, D. I.; Arutyunov, V. S.; Власов, Павел Александрович
Только метаданные
DETERMINATION OF THE RATE OF THERMAL DISSOCIATION OF n-PROPANOL BEHIND REFLECTED SHOCK WAVES
(2024) Smirnov, V. N.; Vlasov, P. A.; Zakharov, A. A.; Shubin, G. A; Власов, Павел Александрович
Только метаданные
Kinetic and thermochemical characteristics of the dissociation of Mo(CO)6 and W(CO)6
(2019) Smirnov, V. N.; Vlasov, P. A.; Власов, Павел Александрович
© 2019 Wiley Periodicals, Inc. The thermal dissociation of gaseous Mo(CO)6 and W(CO)6 in an argon carrier gas, Mo(CO)6 → Mo(CO)5 + CO (1) and W(CO)6 → W(CO)5 + CO (2), is studied over temperature ranges of ∼585–685 K for (1) and ∼690−810 K for (2) at a total gas concentrations of 4 × 10−6 and 4 × 10−5 mol/cm3 by using the shock tube technique in conjunction with absorption spectrophotometry. The measured rate constants are extrapolated to the high-pressure limit by means of a newly developed procedure, with the resultant expressions for the indicated temperature ranges reading as kd1,∞(T),[s−1] = 1016.12 ± 0.68exp[(−148.8 ± 8.1 kJ/mol)/RT] and kd2,∞(T),[s−1] = 1015.93 ± 0.63exp[(−171.7 ± 8.9 kJ/mol)/RT]. Comparison of the high-pressure dissociation rate constants with the published data revealed a considerable discrepancy, a tentative explanation of which is given. Based on the obtained high-pressure dissociation rate constants and the available data on the high-pressure room-temperature rate constants for the reverse reaction of recombination, the first bond dissociation energies for these molecules are evaluated and compared with previous determinations, both theoretical and experimental. The enthalpies of formation of Mo(CO)5 and W(CO)5 are determined: ΔfH°(Mo(CO)5, g, 298.15 K) = −644.1 ± 5.6 kJ/mol and ΔfH°(W(CO)5, g, 298.15 K) = −581.9 ± 6.6 kJ/mol. Based on the enthalpies of formation of Mo(CO)5, W(CO)5, Mo(CO)6, and W(CO)6, and the published molecular parameters of these four species, their thermochemical functions are calculated and presented in the form of NASA seven-term polynomials.
Только метаданные
COMPARISON OF THE EFFECT OF H2 O AND CO2 ADDITIVES ON THE CONVERSION OF METHANE INTO SYNTHESIS GAS
(2023) Akhunyanov, A. R.; Vlasov, P. A.; Smirnov, V. N.; Arutyunov, A. V.; Власов, Павел Александрович