Accession Number : ADA427662


Title :   Microwave-Driven Air Plasma Studies for Drag Reduction and Power Extraction in Supersonic Air


Descriptive Note : Final technical rept. 1 Nov 1999-31 Oct 2002


Corporate Author : PRINCETON UNIV NJ DEPT OF MECHANICAL AND AEROSPACE ENGINEERING


Personal Author(s) : Miles, Richard B ; Macheret, Sergey


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/a427662.pdf


Report Date : 15 Oct 2004


Pagination or Media Count : 123


Abstract : Program involving modeling and experiment to explore the utility of plasmas and magnetohydrodynamics (MHD) for aerodynamic applications. Anomalous behavior of shocks on weakly ionized plasmas has been explained in terms of conventional gas dynamics with temperature gradients. Theoretical and computational models have been developed for plasma aerodynamics and nonequilibrium MHD. Models include a new theory of nonequilibrium dissociation and vibrational relaxation and kinetics of plasmas generated by electron beams and high-voltage nanosecond pulses. Aerodynamic steering using plasma energy addition has been explored using the newly developed microwave-driven supersonic plasma wind tunnel. Potential performance of hypersonic MHD devices with electron beam ionization has been outlined. Plasma and MHD control of hypersonic flows and scramjet inlets was studied. On-ramp MHD device with ionization by electron beams was shown to be capable of maintaining the shock-on-lip condition at Mach numbers higher than the design one, while generating net power. For mass capture increase at Mach numbers lower than the design one, a new concept of virtual cowl was proposed and tentatively studied. In preparation for experimental studies of MHD control of cold-air high-speed flows, ionization by repetitive high-voltage nanosecond pulses was studied theoretically, and a plasma sustained by such pulses was made operational.


Descriptors :   *NONEQUILIBRIUM FLOW , *MAGNETOHYDRODYNAMIC GENERATORS , *DRAG REDUCTION , MATHEMATICAL MODELS , GAS DYNAMICS , ELECTRON BEAMS , HYPERSONIC CHARACTERISTICS , AERODYNAMICS , HYPERSONIC FLOW , MAGNETOHYDRODYNAMICS


Subject Categories : Fluid Mechanics
      Plasma Physics and Magnetohydrodynamics


Distribution Statement : APPROVED FOR PUBLIC RELEASE