Sergey B. Leonov
YOU?
Author Swipe
View article: Experimental Characterization of C–C Composite Destruction Under Impact of High Thermal Flux in Atmosphere and Hypersonic Airflow
Experimental Characterization of C–C Composite Destruction Under Impact of High Thermal Flux in Atmosphere and Hypersonic Airflow Open
Hypersonic flight in the atmosphere is associated with high thermal flux impacting the vehicle surface. The nose, leading edges, and some elements of the engine typically require the implementation of highly refractory materials or an acti…
View article: Interaction of the Shock Train Leading Edge and Filamentary Plasma in a Supersonic Duct
Interaction of the Shock Train Leading Edge and Filamentary Plasma in a Supersonic Duct Open
Quasi-direct current (Q-DC) filamentary electrical discharges are used to control the shock train in a back-pressured Mach 2 duct flow. The coupled interaction between the plasma filaments and the shock train leading edge (STLE) is studied…
View article: Application of High-Speed Self-Aligned Focusing Schlieren System for Supersonic Flow Velocimetry
Application of High-Speed Self-Aligned Focusing Schlieren System for Supersonic Flow Velocimetry Open
A self-aligned focusing schlieren (SAFS) system combines the field of view of a conventional schlieren system with the defocus blur of a focusing schlieren system away from the object plane. It can be assembled in a compact form, measuring…
View article: Flow Structure behind Spanwise Pin Array in Supersonic Flow
Flow Structure behind Spanwise Pin Array in Supersonic Flow Open
This work focused on the experimental characterization of a complex flow structure behind a cross-flow array of cylindrical pins installed on the wall of a supersonic duct. This geometry simulates several common gas dynamic configurations,…
View article: Visualization of sidewall vortices in rectangular nozzle supersonic blowdown wind tunnel
Visualization of sidewall vortices in rectangular nozzle supersonic blowdown wind tunnel Open
This study focuses on the details of the geometry and dynamics of sidewall vortices observed in supersonic wind tunnels with a rectangular cross section of the nozzle and the test section. The formation of sidewall vortices limits the accu…
View article: Waves of Electric Charge Generated by Pulse Corona of Alternating Polarity
Waves of Electric Charge Generated by Pulse Corona of Alternating Polarity Open
The project contributes to DoE Office of Science program “Opportunities in Frontier Plasma Science” by providing plasma science experiments at the Princeton Collaborative Research Facility (PCRF) – the Princeton Plasma Physics Laboratory. …
View article: Electric charge build-up and dissipation at pulsed streamer corona by EFISH and probe measurements
Electric charge build-up and dissipation at pulsed streamer corona by EFISH and probe measurements Open
This work examines the dynamics of volumetric electric charge deposited by a single pin electrode streamer corona in atmospheric air at ambient conditions. Recent studies show that, at pulse-periodic operation, electric charge remains in s…
View article: Triggering Shock Wave Positions by Patterned Energy Deposition
Triggering Shock Wave Positions by Patterned Energy Deposition Open
The problem considered in this work is shock wave (SW) positioning control in shock-dominated flows. Experiments are conducted to investigate the triggering effect of patterned near-surface electrical discharges on SW reflection from plane…
View article: Flow Characterization at Heated Air Supersonic Facility SBR-50
Flow Characterization at Heated Air Supersonic Facility SBR-50 Open
The supersonic wind tunnel facility SBR-50 at the University of Notre Dame was built in 2015 for experimental research related to shock wave (SW) interactions with obstacles and boundary layers (BL) as well as supersonic combustion and a p…
View article: Review of Reduced-Order Models for Homogeneous CO2 Nucleation in Supersonic and Hypersonic Expansion Flows
Review of Reduced-Order Models for Homogeneous CO2 Nucleation in Supersonic and Hypersonic Expansion Flows Open
Several classical and non-classical reduced-order nucleation rate models are presented and compared to experimental values for the homogeneous nucleation rate of CO2 in supersonic nozzles. The most accurate models are identified and are us…
View article: Intensification of mixing of fuel with supersonic air flow when injection and electric discharge are combined
Intensification of mixing of fuel with supersonic air flow when injection and electric discharge are combined Open
This paper presents the results of experimental investigations of DC discharge influence on mixing intensification of transvers injected gas jet into supersonic aiflow. The air was used as injected gas to prevent the influence of chemical …
View article: Oblique shock wave reflection at plasma array presence
Oblique shock wave reflection at plasma array presence Open
This work discusses the effect of a filamentary plasma array on shock wave (SW) reflection pattern and on a shock-induced separation zone geometry. It includes experimental and computational components both. The experimentation was perform…
View article: Research of electronic devices taking into account electromagnetic compatibility
Research of electronic devices taking into account electromagnetic compatibility Open
In this article methods and means of ensuring electromagnetic compatibility were considered, which can be used to reduce the effect of crosstalk between conductors on the device board. We analyzed the causes and mechanism of crosstalk, whi…
View article: Parameters of an electric discharge in a mixing layer of a supersonic air flow and an injected gas
Parameters of an electric discharge in a mixing layer of a supersonic air flow and an injected gas Open
The data obtained by spectral measurements, high-speed video recording and the current-voltage characteristics acquisition allowed to estimate the parameters (T e , n e , σ) of the gas discharge plasma organized in a shear layer formed at …
View article: Editorial conclusions to the special issue on electrical discharges for aerospace applications
Editorial conclusions to the special issue on electrical discharges for aerospace applications Open
International audience
View article: Investigation of Q-DC discharge influence on fuel jet mixing with supersonic airflow
Investigation of Q-DC discharge influence on fuel jet mixing with supersonic airflow Open
This paper presents the results of experimental study of plasma-based actuator for mixing of the fuel with air in a supersonic flow. The long unsteady plasma filament of Q-DC electrical discharge is located along the fuel jet from a wall-a…
View article: Plasma-Assisted Control of Supersonic Flow over a Compression Ramp
Plasma-Assisted Control of Supersonic Flow over a Compression Ramp Open
This study considers the effect of an electric discharge on the flow structure near a 19.4° compression ramp in Mach-2 supersonic flow. The experiments were conducted in the supersonic wind tunnel SBR-50 at the University of Notre Dame. Th…
View article: Effect of DC-discharge geometry on ignition efficiency in supersonic flow
Effect of DC-discharge geometry on ignition efficiency in supersonic flow Open
The plasma-assisted combustion is considered as a prospective approach for ignition of a hydrocarbon fuel and flameholding in a supersonic airflow. Stable flameholding of gaseous and liquid hydrocarbon fuel was achieved by means of surface…
View article: Suppression of reflected oblique shock wave by multi-filamentary plasma
Suppression of reflected oblique shock wave by multi-filamentary plasma Open
This paper describes the results of experimental study of stripwise near-surface plasma effect on oblique shock wave (SW) reflection from a solid wall in a M = 2 duct-driven shock-dominated airflow. Methods applied include schlieren visual…
View article: Electrically Driven Supersonic Combustion
Electrically Driven Supersonic Combustion Open
This manuscript reviews published works related to plasma assistance in supersonic combustion; focusing on mixing enhancement, ignition and flameholding. A special attention is paid for studies, which the author participated in person. The…
View article: Advanced Ignition in Supersonic Airflow by Tunable Plasma System
Advanced Ignition in Supersonic Airflow by Tunable Plasma System Open
The plasma-based technique was studied for ignition and flameholding in a supersonic airflow in different laboratories for a long time. It was shown that flameholding of gaseous and liquid hydrocarbon fuel is feasible by means of surface D…
View article: Plasma-Assisted Control of Mach-2 Flowfield over Ramp Geometry
Plasma-Assisted Control of Mach-2 Flowfield over Ramp Geometry Open
This study examined the effect of Reynolds number on plasma-assisted flow control ahead of a compression ramp geometry in Mach-2 supersonic flow. The experiments were conducted in the supersonic wind tunnel SBR-50 at the University of Notr…
View article: Measurement of corner separation zone response on a compression ramp to plasma actuation within the hypersonic boundary layer
Measurement of corner separation zone response on a compression ramp to plasma actuation within the hypersonic boundary layer Open
This study was performed to characterize the dominant frequencies present in the boundary layer uptsream of and in the corner separation zone of a compression surface in Mach 4.5 flow and to determine a control effect of transient plasma a…
View article: Supersonic Cavity-Based Flow Control Using a Quasi-DC Discharge
Supersonic Cavity-Based Flow Control Using a Quasi-DC Discharge Open
The Quasi-DC (Q-DC) discharge is studied as an active flow control authority on a rear-facing cavity in a supersonic duct by creating an oblique shockwave that impinges the cavity. This geometry simulates the geometry of a typical scramjet…
View article: Numerical simulation of ethylene combustion in supersonic air flow
Numerical simulation of ethylene combustion in supersonic air flow Open
In the present paper, we discuss the possibility of a simplified three-dimensional unsteady simulation of plasma-assisted combustion of gaseous fuel in a supersonic airflow. Simulation was performed by using FlowVision CFD software. Analys…
View article: Plasma-enhanced mixing and flameholding in supersonic flow
Plasma-enhanced mixing and flameholding in supersonic flow Open
The results of experimental study of plasma-based mixing, ignition and flameholding in a supersonic model combustor are presented in the paper. The model combustor has a length of 600 mm and cross section of 72 mm width and 60 mm height. T…
View article: Plasma Aerodynamics : Current Status and Future Directions
Plasma Aerodynamics : Current Status and Future Directions Open
Plasma aerodynamics can trace its origin to the beginning of the space age, and in particular to a time when designers realized that plasmas could have a significant influence on reentry flows. From the 1950s to the 1970s, there was consid…
View article: Experiments on Plasma-Assisted Combustion in a Supersonic Flow : Optimization of Plasma Position in Relation to the Fuel Injector
Experiments on Plasma-Assisted Combustion in a Supersonic Flow : Optimization of Plasma Position in Relation to the Fuel Injector Open
The results of an experimental study of plasma-induced ethylene ignition and flameholding in a supersonic model combustor are presented in the paper. The experimental combustor has a cross-section of 72 mm (width) x 60 mm (height) and leng…
View article: Dynamics of Charge Transfer by Surface Electric Discharges in Atmospheric Air
Dynamics of Charge Transfer by Surface Electric Discharges in Atmospheric Air Open
This work reveals essential details of plasma-surface interaction in atmospheric air that are important for a wide range of applications, beginning from airflow control and up to the high-voltage insulation. The paper discusses experimenta…