elib
DLR-Header
DLR-Logo -> http://www.dlr.de
DLR Portal Home | Imprint | Privacy Policy | Contact | Deutsch
Fontsize: [-] Text [+]

TALIF measurements of atomic oxygen density in L2K plasma wind tunnel

Koch, Uwe and Gülhan, Ali and Ceglia, Giuseppe and Del Vecchio, Antonio (2016) TALIF measurements of atomic oxygen density in L2K plasma wind tunnel. 18 th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics, 4-7.Jul.2016, Lisbon, Portugal.

[img] PDF
631kB

Abstract

Absolute atomic oxygen concentration measurements using two-photon absorption laser induced fluorescence experimental technique have been carried out in high-enthalpy plasma flow. The measurements have been conducted in L2K hypersonic wind tunnel at DLR. The test campaign is performed at 600 A of arc current in air with a mass flow rate of 36 g/s and a stagnation pressure of 105 Pa. The averaged total enthalpy is ~8.4 MJ/kg and the temperature is assumed to be equal to 4218 K. The investigation has been conducted in the freestream and into the shock layer, i.e., 5 mm upstream from the model surface. The estimation of the atomic oxygen concentration is performed by using relative fluorescence signals considering xenon 6p’[3/2]2 transition as reference gas. The effect of the quenching for the atomic oxygen determines a reduction of the lifetimes τ, i.e., 28.8 ns in the freestream and 11.4 ns into the shock layer. The estimation of the atomic oxygen concentration is performed by using relative fluorescence signals considering xenon as reference gas. The number density is equal to ~3.33 × 1023 m-3 in the freestream and ~15.6 × 1023 m-3 into the shock layer.

Item URL in elib:https://elib.dlr.de/106435/
Document Type:Conference or Workshop Item (Speech)
Title:TALIF measurements of atomic oxygen density in L2K plasma wind tunnel
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Koch, UweUwe.Koch (at) dlr.deUNSPECIFIED
Gülhan, AliAli.Guelhan (at) dlr.deUNSPECIFIED
Ceglia, GiuseppeUNSPECIFIEDUNSPECIFIED
Del Vecchio, AntonioUNSPECIFIEDUNSPECIFIED
Date:4 July 2016
Refereed publication:No
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Two-photon LIF, Atomic oxygen, arcjet plasma flow
Event Title:18 th International Symposium on the Application of Laser and Imaging Techniques to Fluid Mechanics
Event Location:Lisbon, Portugal
Event Type:international Conference
Event Dates:4-7.Jul.2016
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transport
DLR - Research area:Raumfahrt
DLR - Program:R RP - Raumtransport
DLR - Research theme (Project):R - Raumfahrzeugsysteme - Anlagen u. Messtechnik
Location: Köln-Porz
Institutes and Institutions:Institute of Aerodynamics and Flow Technology > Über- und Hyperschalltechnologien
Deposited By: Koch, Uwe
Deposited On:24 Oct 2016 12:27
Last Modified:31 Jul 2019 20:03

Repository Staff Only: item control page

Browse
Search
Help & Contact
Information
electronic library is running on EPrints 3.3.12
Copyright © 2008-2017 German Aerospace Center (DLR). All rights reserved.