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Single Pulse Broadband Nitrogen CARS Measurements in the High Enthalpy, Hypersonic Flow Field of L3K at Temperatures up to 5800 K

Fischer, Michael und Koch, Uwe und Esser, Burkard und Guelhan, Ali und Magens, Eggert und Mueller, Martin (2011) Single Pulse Broadband Nitrogen CARS Measurements in the High Enthalpy, Hypersonic Flow Field of L3K at Temperatures up to 5800 K. 7th European Symposium on Aerothermodynamics for Space Vehicles, 9-12 May 2011, Brugge, Belgium.

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Kurzfassung

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.

Dokumentart:Konferenzbeitrag (Vortrag, Paper)
Titel:Single Pulse Broadband Nitrogen CARS Measurements in the High Enthalpy, Hypersonic Flow Field of L3K at Temperatures up to 5800 K
Autoren:
AutorenInstitution oder E-Mail-Adresse der Autoren
Fischer, Michaelmichael.fischer@dlr.de
Koch, Uweuwe.koch@dlr.de
Esser, Burkardburkard.esser@dlr.de
Guelhan, Aliali.guelhan@dlr.de
Magens, Eggerteggert.magens@dlr.de
Mueller, Martinmartin.mueller@dlr.de
Datum:2011
Referierte Publikation:Ja
In ISI Web of Science:Nein
Status:veröffentlicht
Stichwörter:CARS, coherent anti-Stokes Raman scattering, laser spectroscopy, re-entry aerodynamics, high enthalpy flow, temperature measurement
Veranstaltungstitel:7th European Symposium on Aerothermodynamics for Space Vehicles
Veranstaltungsort:Brugge, Belgium
Veranstaltungsart:internationale Konferenz
Veranstaltungsdatum:9-12 May 2011
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebe
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Antriebsforschung
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Aerodynamik und Strömungstechnik > Über- und Hyperschalltechnologien
Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Dr.phil. Christian Willert
Hinterlegt am:23 Jan 2012 09:20
Letzte Änderung:27 Aug 2012 08:57

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