Papers by Sergey Shcherbanev
Combustion and Flame, Jan 31, 2024
HAL (Le Centre pour la Communication Scientifique Directe), May 13, 2019
arXiv (Cornell University), Jul 4, 2023
HAL (Le Centre pour la Communication Scientifique Directe), May 12, 2019
International audienc
HAL (Le Centre pour la Communication Scientifique Directe), Jul 17, 2018
International audienc
arXiv (Cornell University), Jun 27, 2023
In this work, a novel high-fidelity Large Eddy Simulation (LES) setup is used for the first time ... more In this work, a novel high-fidelity Large Eddy Simulation (LES) setup is used for the first time to study the effects of Nanosecond Repetitively Pulsed Discharges (NRPDs) on the formation of NO x. The LES setup includes an accurate description of the combustion and NO x chemistry with an innovative sophisticated modeling of the plasma discharges to account for the impact on the NO x formation. Massively parallel computations of a lab-scale sequential combustor are performed and results are compared with experimental data. Chemical pathways for the formation of NO x due to NRPDs are studied for the first time in a real burner. This is of major importance to limit the NO x emissions that can occur under certain conditions during plasma assisted combustion. The excellent agreement with the experimental data demonstrates the capability of the original LES setup to retrieve the NRPD effects on the turbulent flame and on the formation of NO. Author Contributions Q.M. and N.N. conceived the research idea. Q.M. led the numerical simulation investigations. S.S. and B.D. performed the experiments. N.B. and Q.M. set up the plasma modeling framework. All authors discussed the results. The manuscript was written by Q.M. All authors reviewed and approved the final version of the manuscript.
Journal of Physics D, Aug 31, 2022
HAL (Le Centre pour la Communication Scientifique Directe), Jul 30, 2017
International audienc
A 2D parallel code coupling plasma and hydrodynamics is developed to study the fine structure of ... more A 2D parallel code coupling plasma and hydrodynamics is developed to study the fine structure of streamer and hydrodynamics of nanosecond surface dielectric barrier discharge (nSDBD). A detailed kinetics of 17 species and 34 reactions for fast gas heating is taken into consideration. The structure and propagation of streamers along dielectric surface are studied for positive and negative polarities. The results of calculation are in good agreement with experimental data.
The investigation of the nanosecond surface dielectric barrier discharge (nSDBD) at elevated gas ... more The investigation of the nanosecond surface dielectric barrier discharge (nSDBD) at elevated gas pressures is the aim of the work. The hydrodynamic effects and the initiation of combustion of lean H2:air mixtures, (ER=0.5) are studied experimentally. The discharge was studied in different gas mixtures for the pressure range 1–10 bar. The ignition is initiated by two different discharge modes: streamer or filamentary nSDBD. The influence of the discharge structure and energy deposition on the ignition is demonstrated.
Bulletin of the American Physical Society, 2019
Proceedings of the Combustion Institute
Proceedings of the Combustion Institute
Journal of Engineering for Gas Turbines and Power
In this work we perform an experimental study of the combustion of pure hydrogen in the sequentia... more In this work we perform an experimental study of the combustion of pure hydrogen in the sequential stage of a generic combustor. This academic test rig is a simplified model of an industrial sequential combustor. The sequential fuel is injected using different injector geometries. The composition and temperature of the hot stream at the inlet of the sequential burner are defined by the mass flows of the hot combustion products from the first stage and of the dilution air. This temperature is varied between 1100 K and 850 K by modifying the dilution air mass flow in order to study the different combustion regimes of the sequential hydrogen flame. High-speed imaging of OH radicals chemiluminescence is performed with optical emission spectroscopy to measure vitiated gas temperatures. We investigate the transition from a flame anchored in the sequential combustion chamber, to one stabilized upstream into the mixing section, when the inlet flow temperature is increased. Of particular int...
Journal of Physics D: Applied Physics
The effect of the regime of nanosecond repetitively pulsed discharges (NRPDs) on ignition and sta... more The effect of the regime of nanosecond repetitively pulsed discharges (NRPDs) on ignition and stabilization of a natural-gas/hydrogen/air flame in the sequential stage of a lab-scale atmospheric pressure sequential combustor is investigated experimentally. Electrical parameters of the NRPDs are characterized by measuring voltage, current, and deposited energy. Fast gas heating (FGH) of the nanosecond discharges is measured in a single pulse regime and validated by means of 0D kinetic modelling. It was found that the conventional scheme for energy release from internal degrees of freedom adequately describes the dynamics of FGH in vitiated hot environment diluted with air. Short-gated ICCD imaging and spatially-resolved emission spectroscopy are used to identify the coupling between the NRPDs and the vitiated hot flow. The effectiveness of the NRPDs actuation is assessed through the O H ∗ chemiluminescence images of the sequential flame. The distance of the center of gravity of the s...
Proceedings of the Combustion Institute
Journal of Physics D: Applied Physics
This study investigates the phenomenon of jetting axial flow induced by nanosecond repetitively p... more This study investigates the phenomenon of jetting axial flow induced by nanosecond repetitively pulsed discharges (NRPD) in quiescent ambient air in a pin-to-pin electrode configuration. Axial stratification of discharge parameters (electron number density, temperature, specific energy, etc) influences the hydrodynamic effects leading to directed gas flow from the cathode towards the anode. The experimental results presented in this paper were obtained using schlieren imaging, optical emission spectroscopy (OES), and electrical measurements of the deposited energy. A jetting axial flow was induced for all considered gap distances (0.5–5 mm) and pulse repetition frequencies of ⩾ 10 kHz. The direction of the induced flow is defined by the polarity of the applied high-voltage pulses. It was found that the flow does not arise immediately after the initiation of the first pulse of the applied burst but is induced after a certain number of pulses. Using temporally and spatially resolved O...
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Papers by Sergey Shcherbanev