Presented By: Aerospace Engineering
Chair's Distinguished Lecture: Understanding the Reactivity of Nonequilibrium Molecular Plasmas for Propulsion and Power Applications
Igor V. Adamovich, Professor, Department of Mechanical and Aerospace Engineering, Chemical Physics Graduate Program, Ohio State University
Igor V. Adamovich
Professor
Department of Mechanical and Aerospace Engineering
Chemical Physics Graduate Program
Ohio State University
Understanding the kinetics of molecular energy transfer and chemical reactions in nonequilibrium reactive flows and low-temperature plasmas is critical for a number of engineering applications, such as hypersonic aerothermodynamics and propulsion, high-speed flow control, plasma-assisted combustion, and plasma-enhanced catalysis. Non-intrusive laser diagnostics is critical for probing these environments, where chemical reaction pathways and internal energy relaxation are strongly affected by the applied electric field and by the number densities of excited molecular and atomic species. This talk presents recent results on characterization of reacting molecular plasmas in a slow flow reactor and in a supersonic wind tunnel. The plasmas are sustained by a ns pulse discharge combined with DC or RF voltage waveforms, which improves the plasma stability at high pressures and enables selective generation of vibrationally and electronically excited molecules, as well as atomic species and radicals. Electric field, gas temperature, vibrational level populations of diatomic molecules, and number densities of excited metastable electronic states in these plasmas are measured by Electric Field Induced Second Harmonic (EFISH) generation, Coherent Anti-Stokes Ramas Scattering (CARS), Cavity Ring Down Spectroscopy (CRDS), and Tunable Diode Laser Absorption Spectroscopy (TDLAS). These data provide detailed insight into kinetics of ionization, vibrational relaxation, quenching of excited electronic states, molecular dissociation, energy thermalization (“rapid heating”), and plasma chemical reactions, as well as their coupling to the reacting flow.
About the speaker...
Research interests: kinetics of high-speed nonequilibrium reacting flows and low-temperature plasmas, molecular energy transfer, plasma-assisted combustion, plasma flow control, plasma-enhanced catalysis, molecular lasers, laser diagnostics, and kinetic modeling.
Associate Editor, Plasma Sources Science and Technology. Associate Fellow, American Institute of Aeronautics and Astronautics (AIAA). Publications include over 150 archival journal papers, over 300 conference papers, over 90 invited lectures at national and international conferences, and 2 patents.
Professor
Department of Mechanical and Aerospace Engineering
Chemical Physics Graduate Program
Ohio State University
Understanding the kinetics of molecular energy transfer and chemical reactions in nonequilibrium reactive flows and low-temperature plasmas is critical for a number of engineering applications, such as hypersonic aerothermodynamics and propulsion, high-speed flow control, plasma-assisted combustion, and plasma-enhanced catalysis. Non-intrusive laser diagnostics is critical for probing these environments, where chemical reaction pathways and internal energy relaxation are strongly affected by the applied electric field and by the number densities of excited molecular and atomic species. This talk presents recent results on characterization of reacting molecular plasmas in a slow flow reactor and in a supersonic wind tunnel. The plasmas are sustained by a ns pulse discharge combined with DC or RF voltage waveforms, which improves the plasma stability at high pressures and enables selective generation of vibrationally and electronically excited molecules, as well as atomic species and radicals. Electric field, gas temperature, vibrational level populations of diatomic molecules, and number densities of excited metastable electronic states in these plasmas are measured by Electric Field Induced Second Harmonic (EFISH) generation, Coherent Anti-Stokes Ramas Scattering (CARS), Cavity Ring Down Spectroscopy (CRDS), and Tunable Diode Laser Absorption Spectroscopy (TDLAS). These data provide detailed insight into kinetics of ionization, vibrational relaxation, quenching of excited electronic states, molecular dissociation, energy thermalization (“rapid heating”), and plasma chemical reactions, as well as their coupling to the reacting flow.
About the speaker...
Research interests: kinetics of high-speed nonequilibrium reacting flows and low-temperature plasmas, molecular energy transfer, plasma-assisted combustion, plasma flow control, plasma-enhanced catalysis, molecular lasers, laser diagnostics, and kinetic modeling.
Associate Editor, Plasma Sources Science and Technology. Associate Fellow, American Institute of Aeronautics and Astronautics (AIAA). Publications include over 150 archival journal papers, over 300 conference papers, over 90 invited lectures at national and international conferences, and 2 patents.
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