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TECHNICAL PAPERS

Numerical and Experimental Investigation of an Annular Jet Flow With Large Blockage

[+] Author and Article Information
Christian Del Taglia, Lars Blum, Jürg Gass, Yiannis Ventikos, Dimos Poulikakos

Laboratory for Thermodynamics in Emerging Technologics, Swiss Federal Institute of Technology, ETH-Zentrum, Sonneggstrasse 3, 8092 Zurich, Switzerland

J. Fluids Eng 126(3), 375-384 (Jul 12, 2004) (10 pages) doi:10.1115/1.1760533 History: Received March 20, 2003; Revised January 05, 2004; Online July 12, 2004
Copyright © 2004 by ASME
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Figures

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(a) Sketch of an annular jet. (b) Cross-section of the annular jet device used in the experiments.
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Computational grid with approximately 200,000 mesh points. This grid is referred as coarse grid.
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Axial cross-section of the computational domain and boundary conditions
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SSG-RSM simulations: Axial velocity signal on the symmetry axis at z/D=0.2
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Mean values of the axial (streamwise) velocity component on the symmetry axis. Results of unsteady simulations with a uniform annular jet.
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Steady simulations with a nonuniform annular jet flow: Mean values of the axial velocity component on the symmetry axis
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Mean values of the radial velocity component on the symmetry axis (no-model approach)
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SSG-RSM simulations: Streamlines of (u,w)-vectors on the xz-plane of the simulation coordinate system
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LDA measurements: Streamlines of (v,w)-vectors on the yz-plane of the measurements coordinate system
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No-model approach: Computed coherent fluctuations and experimental total fluctuations
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SSG-RSM simulations: Computed coherent fluctuations and experimental total fluctuations
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SSG-RSM simulations: Computed modeled fluctuations and experimental total fluctuations
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SSG-RSM simulations: Computed total fluctuations and experimental total fluctuations
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Axial velocity fluctuations. Comparison of the two approaches for the Reynolds stresses.
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Axial velocity component on the symmetry axis inside the recirculation zone. Fourier analysis of the auto-correlation functions [Ref. 47] (fine grid, SSG-RSM). Oscillation frequencies at 9.76 Hz (Strouhal number St=0.06) can be observed.

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