Accession Number : ADA194593

Title :   Coupling between Radiation and Gas Dynamics.

Descriptive Note : Annual rept. 1 Feb 87-1 Feb 88,

Corporate Author : PENNSYLVANIA STATE UNIV UNIVERSITY PARK DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Merkle, Charles L ; Micci, Michael M

PDF Url : ADA194593

Report Date : 01 Mar 1988

Pagination or Media Count : 52

Abstract : Direct heat addition of flowing gases by radiation absorption is considered. In the visible wavelength regime, the interaction between concentrated solar energy and a flowing gas is being modeled numerically. Additional analyses of laser-gasdynamic interactions are also being considered. Implicit time-iterative procedures originally developed for transonic flows are being adapted to the low Mach number, low Reynolds number regimes of interest. Two-dimensional solutions show that absorption plasmas can exist over a wide range of flow speeds and that buoyancy is a dominant factor in the forced convection flowfields. In the microwave regime, an experimental investigation of various absorption modes is underway. An overview of the microwave resonant cavity experiment and initial experimental results with nitrogen is presented. Numerical predictions of the planar and propagation plasma mode of microwave absorption in hydrogen, helium and nitrogen are also discussed. Keywords: Laser gasdynamic interaction, Microwave heating, Gases, Beamed energy, Advanced propulsion.

Descriptors :   *GAS DYNAMICS, *PLASMAS(PHYSICS), *LASER BEAMS, *THERMAL PROPULSION SYSTEMS, ADDITION, BUOYANCY, CAVITIES, CONVECTION, FLOW, FLOW FIELDS, GAS FLOW, GASES, HEAT, HEATING, HELIUM, HYDROGEN, INTERACTIONS, LOW RATE, MACH NUMBER, MATHEMATICAL PREDICTION, MICROWAVE FREQUENCY, MICROWAVES, NITROGEN, PLANAR STRUCTURES, PROPAGATION, PROPULSION SYSTEMS, RANGE(EXTREMES), RESONANCE, REYNOLDS NUMBER, SOLAR ENERGY, SOLUTIONS(GENERAL), TRANSONIC FLOW, TWO DIMENSIONAL, VELOCITY, VISIBLE SPECTRA, RADIATION ABSORPTION, RADIANT HEATING

Subject Categories : Fluid Mechanics
      Thermodynamics
      Air Breathing Engines(unconventional)

Distribution Statement : APPROVED FOR PUBLIC RELEASE