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/ | ||||||||||
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Dokumentart: | Konferenzbeitrag (Vortrag) | ||||||||||
Titel: | Simultaneous Measurements of Mixing Fraction and Velocities of a Coaxial Jet in a Turbulent Channel Flow | ||||||||||
Autoren: |
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Datum: | 7 Juli 2014 | ||||||||||
Erschienen in: | 17th International Symposium on Applications of Laser Techniques to Fluid Mechanics | ||||||||||
Open Access: | Nein | ||||||||||
In SCOPUS: | Nein | ||||||||||
In ISI Web of Science: | Nein | ||||||||||
ISBN: | 978-989-98777-8-8 | ||||||||||
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 | ||||||||||
DLR - Schwerpunkt: | Luftfahrt | ||||||||||
DLR - Forschungsgebiet: | L ER - Engine Research | ||||||||||
Standort: | Köln-Porz | ||||||||||
Institute & Einrichtungen: | Institut für Antriebstechnik > Triebwerksmesstechnik |
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