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TECHNICAL PAPERS

Analysis of Vortical Flow Field in a Propeller Fan by LDV Measurements and LES—Part II: Unsteady Nature of Vortical Flow Structures Due to Tip Vortex Breakdown

[+] Author and Article Information
Choon-Man Jang, Masato Furukawa, Masahiro Inoue

Department of Mechanical Science and Engineering, Kyushu University, Fukuoka, Japan

J. Fluids Eng 123(4), 755-761 (Jul 21, 2001) (7 pages) doi:10.1115/1.1412566 History: Received April 28, 2000; Revised July 21, 2001
Copyright © 2001 by ASME
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References

Figures

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Time history of torque on rotor blade for LES
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Turbulence intensity on meridional plane 5 in Fig. 10 of Part I (LES result)
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Turbulence intensity on meridional plane 5 in Fig. 10 of Part I (LDV result)
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Tangentially averaged distribution of pressure-fluctuation and meridional streamlines in time-averaged flow field (numerical result by LES)
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Distribution of relative velocity along instantaneous vortex cores
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Unsteady behavior of vortex core structures colored with normalized helicity
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Fan noise characteristic (Experimental result)
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Spectrum analysis of rotor torque fluctuation (LES result)
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Vortex cores colored with relative velocity (left passage) and with normalized helicity (right passage) in time-averaged flow field
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Distribution of total pressure loss along vortex cores and on planes perpendicular to tip vortex in time-averaged flow field
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Distribution of streamwise absolute vorticity along vortex cores and on planes perpendicular to tip vortex in time-averaged flow field
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Isosurface of pressure fluctuation of 0.07 (purple surface), distribution of wall pressure fluctuation (color contours), limiting streamlines (black lines), and vortex cores colored with normalized helicity in time-averaged flow field
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Pressure fluctuation and limiting streamlines on blade surfaces in time-averaged flow field. (a) Suction surface, (b) pressure surface

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