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Rotational Temperature Meaasurements of N/2-Molecules Reflected from a Wall

Novopashin, S. and Dankert, C. and Lehmkoester, K. and Mohamed, A. and Pot, T. (1996) Rotational Temperature Meaasurements of N/2-Molecules Reflected from a Wall. 20th International Symposium on Rarefied Gas Dynamics, Beijing/China, 19.-24. Aug. 96. Erscheint als Proc. of RGD-20.

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Abstract

The interaction of N/2-molecules with high kinetic energy colliding with a solid hot wall is investigated by the electron beam fluorescence technique. It allows to measure the population of rotational levels of the molecules, which is necessary to define the rotational temperatures of the incoming (undisturbed) and the reflected molecules (coming back from the wall). Using pure N/2 or a NO/N/2 mixtures provides flow velocities up to 1500 m/s in a supersonic free jet expansion; seeding with light gas like He accelerates the flowing molecules up to 3100 m/s. The experimental results show a strong influence of the kinetic energy of the incoming flow, a minor influence of the wall temperature and the material, and an influence of the Knudsen number except for free molecular conditions.

Document Type:Conference or Workshop Item (Speech)
Additional Information: LIDO-Berichtsjahr=1996, pages=6,
Title:Rotational Temperature Meaasurements of N/2-Molecules Reflected from a Wall
Authors:
AuthorsInstitution or Email of Authors
Novopashin, S.UNSPECIFIED
Dankert, C.UNSPECIFIED
Lehmkoester, K.UNSPECIFIED
Mohamed, A.UNSPECIFIED
Pot, T.UNSPECIFIED
Date:1996
Status:Published
Keywords:Gas-surface interaction, heat transfer, spectroscopy of Nitrogen, hypersonic flow
Event Title:20th International Symposium on Rarefied Gas Dynamics, Beijing/China, 19.-24. Aug. 96. Erscheint als Proc. of RGD-20
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 10:08

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