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LIF Measurement of Rotational Temperatures Near a Hot Surface Part II: SiC-Disk in a Hypersonic Free Jet

Gundlach, G. and Dankert, C. and Hefer, G. and Lehmköster, K. (1993) LIF Measurement of Rotational Temperatures Near a Hot Surface Part II: SiC-Disk in a Hypersonic Free Jet. DLR-Interner Bericht. 222 - 93 A 38, 52 S.

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Abstract

The Laser Induced Fluoresence (LIF) spectroscopy is a nonintrusive method to measure temperatures and densities in rarefied flows relevant for reentry simulation of HERMES in wind tunnels. The strong nonequilibrium of rotational and vibrational temperature is due to the rapid expansion in Laval nozzles or free jets and typical for hypersonic wind tunnels. LIF excitation spectra of nitric oxide were measured in hot hypersonic free jet expansions at the DLR Goettingen. The highest flow speeds of 2800 m/s were obtainedby mixing He into the test gas. Downstream in the supersonic flow field two hot disk models were installed, on machined of Cu, one of SiC. By means of the LIF measurements in the free flow and in front of the model surfaces the heat transfer can be examined in detail. It turned out that the accommodation for the rotational energy of the test gas is incomplete. This is relevant for the gas-surface interaction of reentry vehicles.

Document Type:Monograph (DLR-Interner Bericht)
Additional Information: LIDO-Berichtsjahr=1993,
Title:LIF Measurement of Rotational Temperatures Near a Hot Surface Part II: SiC-Disk in a Hypersonic Free Jet
Authors:
AuthorsInstitution or Email of Authors
Gundlach, G.UNSPECIFIED
Dankert, C.UNSPECIFIED
Hefer, G.UNSPECIFIED
Lehmköster, K.UNSPECIFIED
Date:1993
Journal or Publication Title:Auftragsbericht, Auftraggeber DASSAULT Aviation, Velizy/France
Number of Pages:52
Status:Published
Keywords:Laser induced fluorescence; Gas-surface interaction; Non-equilibrium flow; Free jet expansion, Hypersonic flow; Rotational temperature; Internal degrees of freedom; SiC model, nitric oxide (NO)
HGF - Research field:UNSPECIFIED
HGF - Program:Space (old)
HGF - Program Themes:W RP - Raumtransport
DLR - Research area:UNSPECIFIED
DLR - Program:W RP - Raumtransport
DLR - Research theme (Project):UNSPECIFIED
Location: Köln-Porz , Braunschweig , Göttingen
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Institut für Strömungsmechanik > Institut für Experimentelle Strömungsmechanik
Deposited By: elib DLR-Beauftragter
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:07

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