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

Klinner, Joachim and Mayer, Valentin and Heinze, Johannes and 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, 7.-10. July 2014, Lissabon. ISBN 978-989-98777-8-8

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

Abstract

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.

Item URL in elib:https://elib.dlr.de/89798/
Document Type:Conference or Workshop Item (Speech)
Title:Simultaneous Measurements of Mixing Fraction and Velocities of a Coaxial Jet in a Turbulent Channel Flow
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Klinner, Joachimjoachim.klinner (at) dlr.deUNSPECIFIED
Mayer, ValentinUNSPECIFIEDUNSPECIFIED
Heinze, Johannesjohannes.heinze (at) dlr.deUNSPECIFIED
Willert, Christianchris.willert (at) dlr.deUNSPECIFIED
Date:7 July 2014
Journal or Publication Title:17th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
ISBN:978-989-98777-8-8
Status:Published
Keywords:acetone PLIF, PIV, confined jet, turbulent mass flux, RANS
Event Title:17th International Symposium on Applications of Laser Techniques to Fluid Mechanics
Event Location:Lissabon
Event Type:international Conference
Event Dates:7.-10. July 2014
Organizer:International Center for Innovation, Technology and Policy Research
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Propulsion Technology > Engine Measurement Systems
Deposited By: Klinner, Joachim
Deposited On:28 Jul 2014 09:27
Last Modified:28 Jul 2014 09:27

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