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Rayleigh scattering measurements for obtaining spatiallyresolved absolute gas densities in large scale facilities

Beck, Walter and Stockmann, E. and Zaidi, S. H. and Miles, R. B. (2006) Rayleigh scattering measurements for obtaining spatiallyresolved absolute gas densities in large scale facilities. 44th AIAA Aerospace Sciences Meeting and Exhibit, 2006-01-12, Reno, Nevada (USA).

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Abstract

A systematic approach for the use of Rayleigh scattering to determine spatially resolved (along a line) gas densities is presented. Lessons learned from earlier (2003) measurements on the MARIAH II Radiatively-Driven Hypersonic Wind Tunnel (RDHWT) are incorporated into an approach which seeks to address all of the previous difficulties encountered, providing the requisite spatial resolution, suppression of scattered light, calibration and correction for laser shot-to-shot fluctuations in order to obtain data of sufficient quality to validate the predictive MARIAH II models for a 1 MW electron beam coupled into a supersonic flow. A statistical analysis is used to ascertain the necessary measurement accuracy, based on the final required accuracy for the density for its particular application. Laboratory tests are carried out on a free jet expansion using various test gases - air, helium, methane, ethylene and propane – to simulate the density variations expected in the actual experiments. The results are processed and analyzed quantitatively to verify the approach. Although developed with the above-mentioned wind tunnel in mind, the method is generally and universally applicable to any large scale facility.

Document Type:Conference or Workshop Item (Paper)
Additional Information:AIAA Meeting papers Disc 1-5
Title:Rayleigh scattering measurements for obtaining spatiallyresolved absolute gas densities in large scale facilities
Authors:
AuthorsInstitution or Email of Authors
Beck, WalterUNSPECIFIED
Stockmann, E.Department of Mechanical and Aerospace Engineering, Princeton University, Engineering Quadrangle D414, Olden Street, Princeton, NJ 08544 U.S.A.
Zaidi, S. H.Department of Mechanical and Aerospace Engineering, Princeton University, Engineering Quadrangle D414, Olden Street, Princeton, NJ 08544 U.S.A.
Miles, R. B.Department of Mechanical and Aerospace Engineering, Princeton University, Engineering Quadrangle D414, Olden Street, Princeton, NJ 08544 U.S.A.
Date:2006
Refereed publication:No
In SCOPUS:No
In ISI Web of Science:No
Volume:Disc 4
Page Range:pp. 1-13
Editors:
EditorsEmail
American Institute of Aeronautics and Astronautics, UNSPECIFIED
Series Name:Conference Proceedings
Status:Published
Keywords:Rayleigh scattering, air, helium, methane, ethylene and propane
Event Title:44th AIAA Aerospace Sciences Meeting and Exhibit
Event Location:Reno, Nevada (USA)
Event Type:international Conference
Event Dates:2006-01-12
Organizer:AIAA
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:Aircraft Research
DLR - Research area:Aeronautics
DLR - Program:L AR - Aircraft Research
DLR - Research theme (Project):L - Flight Physics
Location: Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Experimental Methods
Deposited By: Ilka Micknaus
Deposited On:06 Mar 2007
Last Modified:27 Apr 2009 13:29

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