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Measurements of the Sub-grid Scale Scalar Flux in a Non-Reacting Jet-Flow

DOI: 10.1615/ICHMT.2006.TurbulHeatMassTransf.460
pages 259-262

M. Loffler
Lehrstuhl für Technische Thermodynamik, Universität Erlangen-Nüirnberg, Am Weichselgarten 8, D-91058 Erlangen, Germany

S. Pfadler
Lehrstuhl für Technische Thermodynamik, Universität Erlangen-Nüirnberg, Am Weichselgarten 8, D-91058 Erlangen, Germany

Frank Beyrau
Lehrstuhl für Technische Thermodynamik (LTT), Universität Erlangen-Nürnberg, Am Weichselgarten 8, D-91058 Erlangen, Germany

Alfred Leipertz
Lehrstuhl fur Technische Thermodynamik (LTT), Universitat Erlangen-Nurnberg,Am Weichselgarten 8, D-91058 Erlangen, Germany; ESYTEC Energie- und Systemtechnik GmbH Erlangen, Am Weichselgarten 6, D-91058 Erlangen, Germany

Friedrich Dinkelacker
nstitute of Fluid and Thermodynamics, Universität Siegen, Germany

Ying Huai
Fachgebiet Energie- und Kraftwerkstechnik, Technische Universität Darmstadt, Petersenstr. 30, D-64287 Darmstadt, Germany

Amsini Sadiki
Institute of Energy and Power Plant Technology, Technische Universität Darmstadt, 64287 Darmstadt, Germany

Abstract

This work presents an experimental approach to the direct determination of the sub-grid scale scalar flux used in Large Eddy Simulation (LES). Two non-reacting jet-flow configurations were examined, one with the jet temperature similar to the ambient air temperature and one preheated jet. Each case was investigated for two different, high Reynolds numbers of 17,471 and 31,714. Hence data were obtained for varying viscosities. For the measurements of mixture fraction and flow velocity field a finest resolution of almost 100 μm was achieved. Thus both the sub-grid scale scalar flux as well as the spatially filtered quantities can be obtained from the same data set. The data were acquired by the simultaneous application of planar laser-induced fluorescence (LIF) and particle image velocimetry (PIV).

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