Planar Rayleigh scattering measurements with an argon—fluoride excimer laser are performed to investigate helium mixing into air at supersonic speeds. The capability of the Rayleigh scattering technique for flow visualization of a turbulent environment is demonstrated in a large-scale, Mach-6 facility. The detection limit obtained with the present setup indicates that planar, quantitative measurements of density can be made over a large cross-sectional area (5 cm × 10 cm) of the flow field in the absence of clusters

Anders, J. B.

Balla, R. Jeffrey

Exton, R. J.

Hillard, M. E.

Shirinzadeh, B.

Waitz, I. A.

English

Planar Rayleigh scattering measurements with an argon-fluoride excimer laser are performed to investigate helium mixing into air at supersonic speeds. The capability of the Rayleigh scattering technique for flow visualization of a turbulent environment is demonstrated in a large-scale, Mach-6 facility. The detection limit obtained with the present setup indicates that planar, quantitative measurements of density can be made over a large cross-sectional area (5 cm x 10 cm) of the flow field in the absence of clusters

B. Shirinzadeh

M. E. Hillard

R. Jeffrey Balla

A. Waitz

J. B. Anders

R. J. Exton

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Planar Rayleigh Scattering Results in Helium-Air Mixing Experiments in a Mach-6 Wind Tunnel

Planar Rayleigh scattering measurements using anArF-excimer0  have been performed to investigate helium mixing into airat1282-274 speeds. The capability of the Rayleigh scattering technique forflow87-24800  of a turbulent environment is demonstrated in a large-scale, Mach6 44412 - The detection limit obtained with the present setup indicatesthates 393 quantitative measurements of density can be made over a large crosssectional-17 (5 cm by 10 cm) of the flow field in the absence of clusters.  2  INTRODUCTION Instantaneous, nonintrusive measurements of flow fields play an important role in fluid mechanics. Various laser-based techniques41397-5 pulsed lasers may be employed to acquire flow visualization data. ta. of these techniques require seeding the flow with species which exhibitlarge44233-47 cross sections.  1,2  In supersonic and hypersonic facilities, where seeding presents environmental or technical problems, the Rayleighscattering2-42400 may be utilized for flow visualization.  ..

J. Exton

I. A. Waitz

Planar Rayleigh Scattering Results In Helium/air Mixing Experiments In A Mach 6 Wind Tunnel

Caltech Authors - Main

Planar Rayleigh scattering results in helium-air mixing experiments in a Mach-6 wind tunnel

Planar Rayleigh scattering measurements using an ArF-excimer laser have been performed to investigate helium mixing into air at supersonic speeds. The capability of the Rayleigh scattering technique for flow visualization of a turbulent environment is demonstrated in a large-scale, Mach 6facility. The detection limit obtained with the present setup indicates that planar, quantitative measurements of density can be made over a large cross sectional area (5 cm by 10 cm) of the flow field in the absence of clusters

NASA Technical Reports Server

Planar Rayleigh Scattering Results in Helium/Air Mixing Experiments in a Mach 6 Wind Tunnel

Absorption of laser light in air in the 193 nm range: analysis of laser locking,&quot;

An investigation of contoured wall injectors for hypervelocity mixing augmentation,&quot;

An investigation of contoured wall injectors for hypervelocity mixing augmentation,&quot; AIAA paper 91-2265 (American Institute of Aeronautics and Astronautics,

Angular and wavelength dependence of the light scattered from a cloud of particles formed by homogeneous nucleation,&quot;

Calculations of 02 absorption and fluorescence at elevated temperatures for a broadband argon-fluoride laser source at 193 nm,&quot;

Compressible boundarylayer density cross sections by UV Rayleigh scattering,&quot;

Condensation effects on Rayleigh scattering measurements in a supersonic wind tunnel,&quot;

Injectant mole-fraction imaging in compressible mixing flows using planar laser-induced iodine fluorescence,&quot;

Nucleation of nitrogen: experiment and theory,&quot;

Progress toward shock enhancement of supersonic combustion processes,&quot; AIAA paper 87-1880 (American Institute of Aeronautics and Astronautics,

Scalar mixing in the supersonic shear layer,&quot; AIAA paper 91-1720 (American Institute of Aeronautics and Astronautics,

Shock enhancement and control of hypersonic mixing and combustion,&quot; AIAA paper 90-1981 (American Institute of Aeronautics and Astronautics,

Study of cluster formation and its effects on Rayleigh and Raman scattering measurements in a Mach 6 wind tunnel,&quot; AIAA paper 91-1496 (American Institute of Aeronautics and Astronautics,

Visualization of supersonic flows with planar laser Rayleigh scattering,&quot; Sandia Rep. SAND89-8401 (Sandia National Laboratories,

http://authors.library.caltech.edu/29806/1/SHIao92.pdf

Planar Rayleigh scattering results in helium-air mixing experiments in a Mach-6 wind tunnel

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