A5019802452- Combustion and flame dynamics
- Advanced Combustion Engine Technologies
- Plasma Applications and Diagnostics
- Laser-induced spectroscopy and plasma
- Plasma Diagnostics and Applications
- Computational Fluid Dynamics and Aerodynamics
- Fluid Dynamics and Turbulent Flows
- Combustion and Detonation Processes
- Plasma and Flow Control in Aerodynamics
- Atmospheric chemistry and aerosols
- Atmospheric and Environmental Gas Dynamics
- Particle Dynamics in Fluid Flows
- Spectroscopy and Laser Applications
- Fire dynamics and safety research
- Rocket and propulsion systems research
- Fluid Dynamics and Heat Transfer
- Radiative Heat Transfer Studies
- Laser Design and Applications
- Wind and Air Flow Studies
- Laser-Plasma Interactions and Diagnostics
- Aerosol Filtration and Electrostatic Precipitation
- Analytical chemistry methods development
- Catalytic Processes in Materials Science
- Mercury impact and mitigation studies
- Catalysts for Methane Reforming
United States Air Force Research Laboratory
2017-2025
U.S. Air Force Research Laboratory Aerospace Systems Directorate
2023-2025
Wright-Patterson Air Force Base
2017-2022
University of Illinois Urbana-Champaign
2014-2017
Michigan State University
2010-2013
Energy and conversion efficiencies of the carbon dioxide (CO <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> ) dissociation process at atmospheric-pressure conditions are investigated using a direct-coupled continuous microwave plasma system (MPS). Gas chromatography mass spectrometer measurements were performed on gas mixture postplasma treatment, over range specific energy inputs (SEIs) (0.06–0.6 eV mol <inline-formula...
Parameters such as fuel injector orientation, flow rate, and stagnation temperature affect scramjet engine operation. In this work, three injection methods were used to supply the combustor of a generic cavity-based flowpath with gaseous ethylene: upstream normal (up1), angled (up2), downstream (down1). Various combinations rates explored using two temperatures ([Formula: see text] [Formula: text]) one pressure for Mach-1.8 facility nozzle. The pre-ignition local equivalence ratio in cavity...
Combustion dynamics are investigated for plasma-enhanced methane-air flames in premixed and nonpremixed configurations using a transient arc dc plasmatron. Planar laser-induced fluorescence images of hydroxyl (OH) carbon monoxide (CO) radicals obtained over range equivalence ratios (φ = 0.7 - 1.3), flow rates (6-18 LPM), plasma powers (100-900 mA) to monitor radical propagation situ fuel reforming. The presented here outside the normal flame stability. In mode, is injected separately as...
A tunable microwave waveguide is used to initiate and enhance combustion by coupling an atmospheric plasma discharge a premixed methane/air flame. The absorbed power ranges from 60 150 W, which was generated continuous source operating at 2.45 GHz, whereas 200 1000 W. OH radical number densities were measured using planar laser-induced fluorescence (PLIF), temperatures Rayleigh scattering thermometry for various flow rates, equivalence ratios, levels. Increases in reaction volume, density,...
This Letter reports the first direct comparison between two-dimensional (2D) and three-dimensional (3D) laser-induced fluorescence (LIF) applied to highly turbulent flames, with goal of experimentally illustrating capabilities limitations volumetric LIF (VLIF). To accomplish these goals, planar (PLIF) VLIF measurements were simultaneously performed on flames based CH radical. The PLIF imaged a cross-section target across 2D field-of-view (FOV) 42 mm×42 mm. same region in flame 3D FOV mm×5...
Planar laser-induced fluorescence (PLIF) of hydroxyl (OH) and formaldehyde (CH2O) radicals was performed alongside stereo particle image velocimetry (PIV) at a 20 kHz repetition rate in highly turbulent Bunsen flame. A dual-pulse burst-mode laser generated envelopes 532 nm pulse pairs for PIV as well pair 355 pulses, the first which used CH2O PLIF. diode-pumped solid-state Nd:YAG/dye system produced excitation beam OH The combined diagnostics simultaneous, temporally resolved two-dimensional...
The influences of inlet geometry modification on flow and combustion dynamics are experimentally investigated in a model supersonic ramjet (scramjet) installed Mach 4.5 high-enthalpy air freestreams. upper-lip angle (6, 12, 20 deg) the intake contraction ratio (1.3 1.9) chosen as generic design parameters varied. With geometries systematically modified, flowfields inside scramjet visualized at cold conditions (room temperature) using planar laser Rayleigh scattering method (wherein radiation...