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Simultaneous Measurements of Mixing Fraction and Velocities of a Coaxial Jet in a Turbulent Channel Flow

Klinner, Joachim und Mayer, Valentin und Heinze, Johannes und Willert, Christian (2014) Simultaneous Measurements of Mixing Fraction and Velocities of a Coaxial Jet in a Turbulent Channel Flow. In: 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics. 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics, 2014-07-07 - 2014-07-10, Lissabon. ISBN 978-989-98777-8-8.

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Offizielle URL: http://ltces.dem.ist.utl.pt/lxlaser/lxlaser2014/index.asp

Kurzfassung

Simultaneous velocity and concentration measurements of the isothermal mixing of a confined coaxial jet in air are performed in a small scale windtunnel at ambient conditions. The Reynolds number is 26000 based on the velocity difference of streams and on the diameter of the injection port. Instantaneous concentration measurements are implemented using planar laser induced fluorescence (PLIF) of acetone seeded injected flow. Simultaneous three-component velocity measurements are performed using stereo particle image velocimetry (PIV). The contribution provides details of the PLIF-PIV measurement setup and of the methodology to obtain instantaneous measurements of the local mixing fraction and velocity. Ensemble averaged velocities, concentrations, Reynolds stresses and turbulent mass fluxes are determined at four positions downstream of the nozzle using up to 3600 PLIF-PIV recordings. The convergence of the root-mean-square of velocity and concentration measurements is assessed in exemplary regions within the shear layers of the mixing zone. The recovered profiles of ensemble averaged velocity, Reynolds stresses and turbulent mass fluxes are compared to Reynolds averaged Navier-Stokes (RANS) and scalar transport simulations. Accompanying RANS calculation of the flow exhibit a strong underestimation of mixing and diffusion rates which can be attributed to the strong anisotropic behavior of this flow.

elib-URL des Eintrags:https://elib.dlr.de/89798/
Dokumentart:Konferenzbeitrag (Vortrag)
Titel:Simultaneous Measurements of Mixing Fraction and Velocities of a Coaxial Jet in a Turbulent Channel Flow
Autoren:
AutorenInstitution oder E-Mail-AdresseAutoren-ORCID-iD
Klinner, Joachimjoachim.klinner (at) dlr.dehttps://orcid.org/0000-0003-2709-9664
Mayer, Valentin
Heinze, Johannesjohannes.heinze (at) dlr.de
Willert, Christianchris.willert (at) dlr.dehttps://orcid.org/0000-0002-1668-0181
Datum:7 Juli 2014
Erschienen in:17th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Referierte Publikation:Ja
Open Access:Nein
Gold Open Access:Nein
In SCOPUS:Nein
In ISI Web of Science:Nein
ISBN:978-989-98777-8-8
Status:veröffentlicht
Stichwörter:acetone PLIF, PIV, confined jet, turbulent mass flux, RANS
Veranstaltungstitel:17th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Veranstaltungsort:Lissabon
Veranstaltungsart:internationale Konferenz
Veranstaltungsbeginn:7 Juli 2014
Veranstaltungsende:10 Juli 2014
Veranstalter :International Center for Innovation, Technology and Policy Research
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Luftfahrt
HGF - Programmthema:Antriebssysteme
DLR - Schwerpunkt:Luftfahrt
DLR - Forschungsgebiet:L ER - Engine Research
DLR - Teilgebiet (Projekt, Vorhaben):L - Virtuelles Triebwerk und Validierungsmethoden (alt)
Standort: Köln-Porz
Institute & Einrichtungen:Institut für Antriebstechnik > Triebwerksmesstechnik
Hinterlegt von: Klinner, Dr.-Ing. Joachim
Hinterlegt am:28 Jul 2014 09:27
Letzte Änderung:24 Apr 2024 19:55

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