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Thursday, July 30, 2020 | History

2 edition of Characterization of arcjet flows using laser-induced fluorescence found in the catalog.

Characterization of arcjet flows using laser-induced fluorescence

Characterization of arcjet flows using laser-induced fluorescence

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  • 38 Currently reading

Published by American Institute of Aeronautics and Astronautics, [National Aeronautics and Space Administration, National Technical Information Service, distributor in Washington, DC, Springfield, Va .
Written in English

    Subjects:
  • Laser induced fluorescence.,
  • Flow velocity.,
  • Jet flow.,
  • Real time operation.,
  • Velocity measurement.

  • Edition Notes

    StatementD.J. Bamford ... [et al.].
    SeriesNASA-TM -- 111816., NASA technical memorandum -- 111816.
    ContributionsBamford, D. J., United States. National Aeronautics and Space Administration.
    The Physical Object
    FormatMicroform
    Pagination1 v.
    ID Numbers
    Open LibraryOL15498359M

    Our most extensive, collective effort has been to apply laser-induced fluorescence, Doppler-free laser absorption, and Raman scattering to the characterization of hydrogen and helium arcjet flows. Detailed measurements of velocity, temperatures, and electron densities are compared to the results of magneto-hydrodynamic flowfield simulations. Ronald K. Hanson's 5 research works with 78 citations and 61 reads, including: Laser-induced fluorescence diagnostic for temperature and velocity measurements in a hydrogen arcjet plume.

    A gas jet is extracted from a dc arc in hydrogen with approximately 1% added hydrocarbons; polycrystalline diamond grows below the stagnation point of Cited by: 2. Gas analysis using Laser-Induced Fluorescence. Laser-Induced Fluorescence measurements were carried out using the third harmonic of a Nd:YAG laser (Type QuantaRay by Spectra-Physics, USA), corresponding to a wavelength of nm. A repetition rate of Cited by:

    Downwards co-current gas–liquid annular flows were studied experimentally and characterized. An advanced optical laser-based measurement technique, namely Planar Laser-Induced Fluorescence (PLIF), was used for the visualization of the annular flow over a range of liquid Reynolds numbers Re L = – 1 and gas Reynolds numbers Re G = 0 – 84 Four distinct flow regimes, namely the Cited by: Characterization of inverse diffusion flames in vitiated cross flows via two-photon planar laser-induced fluorescence of CO and 2-D thermometry Author links open overlay panel Daniel R. Richardson a Naibo Jiang a David L. Blunck b 1 James R. Gord b Sukesh Roy aCited by: 8.


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Characterization of arcjet flows using laser-induced fluorescence Download PDF EPUB FB2

Books. AIAA Education Series; Library of Flight; Progress in Astronautics and Aeronautics; The Aerospace Press; Browse All Books; Meeting Papers; Standards; Other Publications.

Software/Electronic Products; Aerospace America ; Public Policy Papers ; ed by: Arcjet flow properties determined from laser-induced fluorescence of atomic nitrogen. 36th AIAA Aerospace Sciences Meeting and by: Characterization of Arcjet Flows Using Laser-Induced Fluorescence.

By David A. Stewart, Anthony O'Keefe, Anthony W. Strawa, Dikran S. Babikian and Douglas J. Bamford. Abstract. A sensor based on laser-induced fluorescence has been installed at the MW NASA Ames Aerodynamic Heating Facility. The sensor has provided new, quantitative, real.

Get this from a library. Characterization of arcjet flows using laser-induced fluorescence. [D J Bamford; United States. National Aeronautics and Space Administration.;]. AIREX: Characterization of Arcjet Flows Using Laser-Induced Fluorescence A sensor based on laser-induced fluorescence has been installed at the 20.

Laser-induced fluorescence of the Balmer–alpha (Hα) transition of atomic hydrogen was performed within the nozzle of a 1-kW class radiatively cooled arcjet thruster operating on hydrogen and synthesized-hydrazine propellants.

Atomic hydrogen in the plume of a dc-arcjet plasma is monitored by use of two-photon excited laser-induced fluorescence (LIF) during the deposition of diamond film. Laser-induced fluorescence (LIF) measurements of seeded nitric oxide and naturally occurring species in a diamond-depositing dc arcjet of hydrogen/argon/methane () at 25 Torr are used to determine the temperature and velocity fields in a gas jet.

Books. AIAA Education Series; Library of Flight; Progress in Astronautics and Aeronautics; The Aerospace Press; Browse All Books; Meeting Papers; Standards; Other Publications. Software/Electronic Products; Aerospace America ; Public Policy Papers ; When combined with information from facility measurements, an analysis of the flow properties obtained using two-photon LIF of N yields the total free-stream flow enthalpy.

Flow property measurements that were recently acquired in the Ames Research Center Aerodynamic Heating Facility arcjet using two-photon laser-induced fluorescence (LIF) of atomic nitrogen (N) are reported. Laser-induced fluorescence is used to characterize the axial velocity and temperature field at the exit plane of a low-power helium arcjet.

Two cases were examined, one in which the mass-flow rate was changed at a constant current, and the other where the current was changed at Author: Q.E. Walker, M.A. Cappelli. Flow Characterization of a Diamond-Depositing DC Arcjet by Laser-Induced Fluorescence. Juchmann W, Luque J, Jeffries JB Appl Opt, 39(21), 01 Jul A characterization of the arcjet is presented, showing stable operation over a range of current at hydrogen flow rates between 8 and 20 l/min.

Laser induced fluorescence is used to determine the plasma velocity and temperature. Arcjet exit plane velocities in excess of 10 km/s together with temperatures on the order of C have been measured. Arcjet flow properties determined from laser-induced fluorescence of atomic nitrogen 20 March | Applied Optics, Vol.

38, No. 9 The effect of entrance conditions on an expanding arcjet flowCited by:   Arcjet nozzle flow-field characterization by laser-induced fluorescence.

Storm PV, Cappelli MA. Laser-induced fluorescence of the Balmer-alpha (H(alpha)) transition of atomic hydrogen was performed within the nozzle of a 1-kW class radiatively cooled arcjet thruster operating on hydrogen and synthesized-hydrazine by: 7.

Abstract We describe the use of laser-induced fluorescence to measure the velocity and temperature profiles of a helium arcjet plasma thruster. These studies are motivated by the desire to better understand arcjet plasma flows for their use in space propulsion.

Nonintrusive Diagnostic Strategies for Arcjet Stream Characterization. of understanding of the arcjet flows was seen to preclude the use of arcjets as aerothermodynamic test facilities beyond.

As part of this effort, a laser-spectroscopic instrument has been developed to characterize the flow environment by measuring the free-stream enthalpy in large-scale arc-jet facilities.

This approach involves making flow-property measurements using two-photon laser-induced fluorescence (LIF) of atomic nitrogen; it was recently demonstrated in a series of tests conducted in the Aerodynamic.

Among the newest measurement techniques are those based on laser induced fluorescence. The first successful application of fluorescence imaging was reported in Despite this short history LIF techniques have become very powerful and are the most widely used non Cited by: 2.

A diagnostic has been developed to measure velocity and translational temperature in the plume of a 1-kW-class arcjet thruster operating on hydrogen. Laser-induced fluorescence with a narrow-band cw laser is used to probe the Balmer α transition of excited atomic hydrogen.

The velocity is determined from the Doppler shift of the fluorescence excitation spectrum, whereas the temperature is. Laser-induced fluorescence (LIF) or laser-stimulated fluorescence (LSF) is a spectroscopic method in which an atom or molecule is excited to a higher energy level by the absorption of laser light followed by spontaneous emission of light.

It was first reported by Zare and coworkers in LIF is used for studying structure of molecules, detection of selective species and flow visualization.Atomic hydrogen in the plume of a dc-arcjet plasma is monitored by use of two-photon excited laser-induced fluorescence (LIF) during the deposition of diamond film.

The effluent of a dc-arc discharge in hydrogen and argon forms a luminous plume as it flows through a converging–diverging nozzle into a reactor. When a trace of methane (flow in the diverging part of the.An experimental investigation of high-enthalpy air flow generated by L2K arc-jet facility of DLR is carried out by means of two-photon absorption laser-induced fluorescence (TALIF) measurements of.