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Search for Spectral Gaps in HEG

Beck, W.H. and Wollenhaupt, M. (1995) Search for Spectral Gaps in HEG. DLR-Interner Bericht. 223-95 A 44. 17 S.

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Spontaneous emission from the shock heated gas (luminosity) in the high enthalpy shock tunnel at condition I (nominally 50 MPa burst pressure with specific enthalpy 21 MJ/kg) has been examined spectrally in order to search for spectral windows where LIF measurements could be corried out. Comparison with NO fluorescence spectra showed, that the fluorescence radiation following D(0)<--X(1)excitation only partially overlaps the lower wavelength regions of the intensity distribution of the luminosity. Two strategies to reduce the influence of this spontaneous emission have been developed: (1) for 1d-spatial resolution, spectral filtering using a spectrometer is appropriate: (2) for planar LIF-imaging narrowband reflection filters had to be developed. In spite of these filtering methods the (P)LIF method has still constraints imposed by the powerful radiation behind strong shocks.

Item URL in elib:https://elib.dlr.de/37412/
Document Type:Monograph (DLR-Interner Bericht)
Additional Information: LIDO-Berichtsjahr=1995,
Title:Search for Spectral Gaps in HEG
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Journal or Publication Title:Auftragsbericht, ESA Contract 11076/94/F/WE, MSTP Phase 2, Report No. HT-TR-E34-303-DLRG
Open Access:No
Number of Pages:17
Keywords:Laser induced fluorescence LIF; Nitric oxide (NO); emission spectra; High enthalpy; Shock tunnel HEG
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: DLR-Beauftragter, elib
Deposited On:03 Apr 2006
Last Modified:27 Apr 2009 10:08

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