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Experimental and Numerical Analysis of an Expansion Flow in Chemical and Thermal Nonequilibrium

Weisgerber, H. and Fischer, M. and Magens, E. and Beversdorff, M. and Link, T. and Koschel, W. (1999) Experimental and Numerical Analysis of an Expansion Flow in Chemical and Thermal Nonequilibrium. In: Fourteenth International Symposium on Air Breathing Engines. AIAA. XIV ISABE, Florence, Italy; 5-10 September, 1999. ISBN 1-56347-357-7.

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Abstract

Results of a basic experiment on a high-expanding nozzle flow in hot gas conditions are presented and discussed. Gas flow temperatures and velocities at various locations at the inlet and the exit of a hypersonic nozzle designed for a hydrogen burning ramjet model were determined. The flow velocity was measured by laser two-focus velocimetry,detecting seeded TiO2-particles whose behavior in fast expanding flows was examined experimentally and numerically. CARS was applied to measure nitrogen single pulse spectra from which vibrational and rotational temperatures were determined. The flow at the exit of the nozzle shows a market thermal nonequilibrium because of the molecular exchange processes, which cannot keep pace with the expansion. The experimental results are compared to a numerical computation by a 2D FEM code solving the Navier-Stokes equations for a chemically reacting mixture of gases, using a reduced chemical kinetic scheme and modeling the vibrational energy and its relaxation by the Landau-Teller theory. Experimental and numerical results are in excellent agreement.

Document Type:Conference or Workshop Item (Paper)
Additional Information: LIDO-Berichtsjahr=1999, monograph_id=ISABE 99-7134,
Title:Experimental and Numerical Analysis of an Expansion Flow in Chemical and Thermal Nonequilibrium
Authors:
AuthorsInstitution or Email of Authors
Weisgerber, H.UNSPECIFIED
Fischer, M.UNSPECIFIED
Magens, E.RSB-Optotechnik GmbH
Beversdorff, M.UNSPECIFIED
Link, T.RWTH Aachen
Koschel, W.UNSPECIFIED
Date:1999
Journal or Publication Title:Fourteenth International Symposium on Air Breathing Engines
Editors:
EditorsEmail
International Society for Air Breathing Engines (ISABE), UNSPECIFIED
Publisher:AIAA
ISBN:1-56347-357-7
Status:Published
Keywords:Numerical Analysis, Gas Expansion, Nonequilibrium Conditions, Nozzle Flow, Gas Temperature, CARS, Navier-Stokes Equation, Finite Element Method
Event Title:XIV ISABE, Florence, Italy; 5-10 September, 1999
Organizer:ISOABE
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):E -- no assignement
Location: Lampoldshausen
Institutes and Institutions:Institute of Space Propulsion
Institute of Propulsion Technology
Deposited By: elib DLR-Beauftragter
Deposited On:16 Sep 2005
Last Modified:06 Jan 2010 13:44

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