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Single pulse broadband nitrogen CARS measurements on a high enthalpy, hypersonic flow field at temperatures up to 5800 K

Fischer, M. and Magens, E. and Müller, M. and Koch, U. and Esser, B. and Gülhan, A. (2010) Single pulse broadband nitrogen CARS measurements on a high enthalpy, hypersonic flow field at temperatures up to 5800 K. In: Conference proceedings on CD, 2010 (ISL-PR 808/2010). Deutsch-Französiches Forschungsinstitut Saint Louis. Measurement and Optical Techniques for Aerospace Research (MOTAR), 29.-30. März 2010, St.Louis, Frankreich.

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Abstract

Single pulse broadband Coherent Anti-Stokes Raman Scattering (CARS) was used to measure the thermal non-equilibrium flow properties in the high enthalpy hypersonic flow field (11.8 MJ/kg, 5800 K) of the arc heated facility L3K in Cologne. Nitrogen CARS was applied in the free stream flow at 64 mbar and in the vicinity front of a probe body at app. 1 bar. At both conditions a distinct thermodynamic non-equilibrium was found, but vice versa for both positions. In the free stream the vibrational temperature was about 920 K higher than the rotational temperature, which should be in equilibrium with the translational movement within a few collisions. Downstream the shock front (e.g. between shock and body) a rotational temperature exceeded the vibrational temperature by about 1100 K. The CARS measurements on nitrogen were chosen because of the high thermal stability of molecular nitrogen, resulting in a mass fraction of still 76 %. Additionally, the spectral simulation of nitrogen CARS spectra is well developed. The aim of this study was to test the feasibility to perform time resolved CARS temperature measurements on nitrogen which is the main molecular component of the flow. Details of the experimental set up and results are presented.

Document Type:Conference or Workshop Item (Speech)
Title:Single pulse broadband nitrogen CARS measurements on a high enthalpy, hypersonic flow field at temperatures up to 5800 K
Authors:
AuthorsInstitution or Email of Authors
Fischer, M.DLR-AT, Michael.Fischer@dlr.de
Magens, E.DLR-AT
Müller, M.DLR-AT
Koch, U.DLR-AS-HY
Esser, B.DLR-AS-HY
Gülhan, A.DLR-AS-HY
Date:29 March 2010
Journal or Publication Title:Conference proceedings on CD
Volume:2010
Editors:
EditorsEmail
Leopold, FriedrichDeutsch-Französiches Forschungsinstitut Saint Louis, 5 rue Général Cassagnou, F - 68301 Saint-Louis (France)
Publisher:Deutsch-Französiches Forschungsinstitut Saint Louis
Series Name:MOTAR Proceedings
Status:Published
Keywords:Coherent Anti-Stokes Raman Scattering (CARS), thermal non-equilibrium, vibrational temperature, rotational temperature, high enthalpy hypersonic flow field, arc heated facility, temperature, measurement, nitrogen
Event Title:Measurement and Optical Techniques for Aerospace Research (MOTAR)
Event Location:St.Louis, Frankreich
Event Type:international Conference
Event Dates:29.-30. März 2010
Organizer:Deutsch-Französiches Forschungsinstitut Saint Louis (ISL)
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:Space
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):W - Grundlagen Raumtransport - Innovativer Thermalschutz (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Supersonic and Hypersonic Technology
Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Dr.rer.nat. Michael Fischer
Deposited On:16 Dec 2010 13:30
Last Modified:16 Dec 2010 13:30

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