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Two-Photon Laser-Induced Fluorescence Measurements of Atomic Oxygen Density in Hypersonic Plasma Flow

Ceglia, Giuseppe and Del Vecchio, Antonio and Koch, Uwe and Esser, Burkard and Gülhan, Ali (2018) Two-Photon Laser-Induced Fluorescence Measurements of Atomic Oxygen Density in Hypersonic Plasma Flow. Journal of Thermophysics and Heat Transfer, 33 (2), pp. 292-299. American Institute of Aeronautics and Astronautics (AIAA). doi: 10.2514/1.T5354. ISSN 0887-8722.

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Official URL: https://doi.org/10.2514/1.T5354


An experimental investigation of high-enthalpy air flow generated by L2K arc-jet facility of DLR is carried out by means of two-photon absorption laser-induced fluorescence (TALIF) measurements of atomic oxygen at O×3p×3P1;2;0 transition. The experiment has been conducted with an arc current of 600 A, a mass flow rate of 36 g∕s, and a total pressure of 105 Pa, resulting in both mass-specific enthalpy of ∼8.4 MJ∕kg and a reservoir temperature of 4200 K. Atomic oxygen has been characterized in terms of translational temperature and absolute number density either in the freestream or behind a shock wave upstream a blunt body. A calibration method based on TALIF measurements of xenon at 6p'[3∕2]2 transition has been used. The results highlight that in the freestream the fluorescence signal exhibits a peak activity lower with respect to that inspected in the shock layer. The measured lifetimes 25.8 ns and 11.4 ns indicate that, in the shock layer, the depletion of the atomic Oxygen excited state occurs mainly via quenching. The analysis of the line broadening of the spectral profile of atomic oxygen reveals an increment of the translational temperature in the shock layer with respect to that measured in the freestream, resulting in 2500 K and 1400 K, respectively. It is found that in the freestream the absolute number density attains ∼5.55E23 m-3 and the presence of the shock wave induces an increment of the number density of ∼26.9E23 m−3, that is, 4.85 times higher than that detected in the freestream.

Item URL in elib:https://elib.dlr.de/121721/
Document Type:Article
Title:Two-Photon Laser-Induced Fluorescence Measurements of Atomic Oxygen Density in Hypersonic Plasma Flow
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Koch, UweUwe.Koch (at) dlr.deUNSPECIFIED
Esser, BurkardBurkard.Esser (at) dlr.deUNSPECIFIED
Gülhan, AliAli.Guelhan (at) dlr.deUNSPECIFIED
Date:14 September 2018
Journal or Publication Title:Journal of Thermophysics and Heat Transfer
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2514/1.T5354
Page Range:pp. 292-299
EditorsEmailEditor's ORCID iD
Publisher:American Institute of Aeronautics and Astronautics (AIAA)
Keywords:high enthalpy flow; spectroscopy; laser-induced fluorescence; hypersonic flow; shock layer; arc-heated facility
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Transportation
DLR - Research area:Raumfahrt
DLR - Program:R RP - Space Transportation
DLR - Research theme (Project):R - Wiederverwendbare Raumfahrtsysteme (old)
Location: Köln-Porz
Institutes and Institutions:Institute for Aerodynamics and Flow Technology > Supersonoc and Hypersonic Technology
Deposited By: Esser, Dr.-Ing. Burkard
Deposited On:18 Sep 2018 10:40
Last Modified:05 Nov 2020 07:44

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