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Velocity Determination in High Enthalpy Ground Testing Facilities

Löhle, Stefan and Laux, Torsten and Auweter-Kurtz, Monika (2005) Velocity Determination in High Enthalpy Ground Testing Facilities. 4th AAAF International Symposium:Atmospheric Reentry Vehicles and Systems, 2005-03-21 - 2005-03-23, Arcachon, Frankreich.

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Abstract

The flow velocity is of significant importance in plasma wind tunnels, because the enthalpy and hence the chemical reaction processes in the boundary layer near the surface consist mainly of the high velocity. In real re-entry scenarios, the plasma is resulting from the strong bow shock in front of the vehicle which is again the result of the high velocity. In this paper, a comparison is made between the theoretically estimated velocity from basic equations for hypersonic flow conditions and experimentally gained velocities using Fabry-Perot-Interferometry. This optical diagnostic means is used in the present investigation to measure the translational temperature and velocity of nitrogen atoms. Depending on the ambient pressure, velocities between 1000m/s and 4000m/s have been measured. The detectability limit is the emission spectra of the flow which is influenced by the oxygen mass flow and the input power of the generator. Under the assumption of chemical equilibrium, several possible comparisons are made leading to the result that the pure nitrogen flows are considerably in non-equilibrium.

Item URL in elib:https://elib.dlr.de/20374/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:Velocity Determination in High Enthalpy Ground Testing Facilities
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Löhle, StefanInstitut für Raumfahrtsysteme, Universität StuttgartUNSPECIFIED
Laux, TorstenUNSPECIFIEDUNSPECIFIED
Auweter-Kurtz, MonikaInstitut für Raumfahrtsysteme, Universität StuttgartUNSPECIFIED
Date:March 2005
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Fabry-Perot-Interferometry, Pitot pressure measurements, plasma wind tunnel, flow velocity
Event Title:4th AAAF International Symposium:Atmospheric Reentry Vehicles and Systems
Event Location:Arcachon, Frankreich
Event Type:international Conference
Event Dates:2005-03-21 - 2005-03-23
Organizer:AAAF
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):W - Projekt ASTRA - Teilprojekt IMENS (old)
Location: Stuttgart
Institutes and Institutions:Institute of Structures and Design > Space Structural Components
Deposited By: Laux, Dr.-Ing. Torsten
Deposited On:14 Dec 2005
Last Modified:31 Jul 2019 19:16

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