Journal ArticleDOI
Two-dimensional model of laser-sustained plasmas in axisymmetric flowfields
Ronald J. Glumb,Herman Krier +1 more
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In this paper, a two-dimensional numerical model of laser-sustain ed plasmas in flowing argon has been developed, where real gas properties and a complete radiation loss mechanism have been included, but radial velocities in the flowfield are neglected.Abstract:
A two-dimensional numerical model of laser-sustain ed plasmas in flowing argon has been developed. Real-gas properties and a complete radiation loss mechanism have been included, but radial velocities in the flowfield are neglected. Calculated plasma size, peak temperatures, global absorption characteristics, and thermal efficiencies are in good agreement with experiment. Radiation loss is found to be the dominant process at high laser powers, although thermal conversion efficiencies in excess of 40% (at 20 kW) can be realized by operating at high flow velocities. Nomenclature c = speed of light Cp = specific heat, J/kg - K D - focus spot diameter, mm e = electronic charge / = optical / number h = Planck constant / = laser intensity, W/m2 K = thermal conductivity, W/m-K kB = Boltzmann constant ne = electron number density, m~ 3 me - electron mass r = radius, m t =time, s T = temperature, K u,v = axial and radial velocity components, respectively, m/s z = axial position, m Zeff = radiation loss correction factor a = absorption coefficient, 1/m e = emission coefficient, W/m3 p = density, kg/m3 vc = continuum cutoff frequency, s~*read more
Citations
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Journal ArticleDOI
Concepts and status of laser-supported rocket propulsion
Ronald J. Glumb,Herman Krier +1 more
TL;DR: An overview of the status of laser propulsion based on a review of the scientific literature is given in this article, where an evaluation of the advantages and limitations of the laser propulsion, as well as the types of missions for which it can best be used are discussed.
Journal ArticleDOI
Spectroscopic studies of plasma during cw laser materials interaction
TL;DR: The role of plasma during cw laser materials interaction was studied using emission spectroscopy in this paper, where the experimental results were used to estimate laser attenuation and refraction as the beam propagated through the plasma column.
Journal ArticleDOI
Heat transfer-a review of 1986 literature
E. R. G. Eckert,Richard J Goldstein,E. Pfender,W. E. Ibele,Suhas V. Patankar,James W. Ramsey,Terrence W. Simon,N.A. Decker,Thomas H. Kuehn,Handol Lee,Steven L. Girshick +10 more
A Unified Treatment of the Relaxation Phenomenon in Radiating Argon Plasma Flows Behind Incident and Bow Shock Waves
TL;DR: Electronic relaxation of shock heated nonequilibrium argon plasma flow behind incident and bow shock waves was studied in this article, showing that it can be used to generate bow-shaped bow shocks.
Journal ArticleDOI
Laser-sustained plasmas in forced convective argon flow. II - Comparison of numerical model with experiment
TL;DR: In this paper, a two-dimensional laser-sustained plasma model, which is based on the laminar, Navier-Stokes equations for the flow and geometric ray tracing for the laser beam, has been evaluated and compared with existing experimental results for a wide range of forced convective argon flows.
References
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Book
Physics and Technology of Low-Temperature Plasmas
TL;DR: In this article, high frequency induction plasmatrons are discussed together with arc-plasmatron, the theory of the plasma at equilibrium, a two-temperature plasma model, aspects of heat transfer in the case of a flow of a low temperature plasma about a body, and the dynamics of motion and the heating of refractory particles in plasma jets.
Journal ArticleDOI
Concepts and status of laser-supported rocket propulsion
Ronald J. Glumb,Herman Krier +1 more
TL;DR: An overview of the status of laser propulsion based on a review of the scientific literature is given in this article, where an evaluation of the advantages and limitations of the laser propulsion, as well as the types of missions for which it can best be used are discussed.
Journal ArticleDOI
Analytical Study of Laser-Supported Combustion Waves in Hydrogen
Nelson H. Kemp,Robert G. Root +1 more
TL;DR: In this paper, a one-dimensional energy equation with constant pressure and area was used to model the LSC wave and a numerical method for coupling the energy equation to the stream tube flow was developed, and a sample calculation was performed.
A Unified Treatment of the Relaxation Phenomenon in Radiating Argon Plasma Flows Behind Incident and Bow Shock Waves
TL;DR: Electronic relaxation of shock heated nonequilibrium argon plasma flow behind incident and bow shock waves was studied in this article, showing that it can be used to generate bow-shaped bow shocks.
Journal ArticleDOI
A unified treatment of the relaxation phenomenon in radiating argon plasma flows.
TL;DR: In this article, the electronic relaxation of shock-heated nonequilibrium argon plasma flow in microscopic- macroscopic treatment is described, and the flow is shown to be stable.
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