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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

Schlechtriem, S., and Lotzerich, M., 1997, “Breakdown of Tip Leakage Vortices in Compressors at Flow Conditions Close to Stall,” ASME Paper No. 97-GT-41.
Furukawa,  M., Saiki,  K., Nagayoshi,  K., Kuroumaru,  M., and Inoue,  M., 1998, “Effects of Stream Surface Inclination on Tip Leakage Flow Fields in Compressor Rotors,” ASME J. Turbomach., 120, No. 4, pp. 683–694.
Furukawa,  M., Inoue,  M., Saiki,  K., and Yamada,  K., 1999, “The Role of Tip Leakage Vortex Breakdown in Compressor Rotor Aerodynamics,” ASME J. Turbomach., 121, No. 3, pp. 469–480.
Furukawa, M., Saiki, K., Yamada, K., and Inoue, M., 2000, “Unsteady Flow Behavior Due to Breakdown of Tip Leakage Vortex in an Axial Compressor Rotor at Near-Stall Condition,” ASME Paper No. 2000-GT-0666.
Sarpkaya,  T., 1971a, “On Stationary and Traveling Vortex Breakdowns,” J. Fluid Mech., 45, pp. 545–559.
Sarpkaya,  T., 1971b, “Vortex Breakdown in Swirling Conical Flows,” AIAA J., 9, No. 9, pp. 1792–1799.
Hall,  M. G., 1972, “Vortex Breakdown,” Annu. Rev. Fluid Mech., 4, pp. 195–218.
Leivovich,  S., 1978, “The Structure of Vortex Breakdown,” Annu. Rev. Fluid Mech., 10, pp. 211–246.
Leivovich,  S., 1984, “Vortex Stability and Breakdown: Survey and Extension,” AIAA J., 22, No. 9, pp. 1192–1206.
Escudier,  M., 1988, “Vortex Breakdown: Observations and Explanations,” Prog. Aerosp. Sci., 25, No. 2, pp. 189–229.
Brücker,  C., and Althaus,  W., 1992, “Study of Vortex Breakdown by Particle Tracking Velocimetry (PTV) Part 1: Bubble-Type Vortex Breakdown,” Exp. Fluids, 13, pp. 339–349.
Brücker,  C., 1993, “Study of Vortex Breakdown by Particle Tracking Velocimetry (PTV) Part 2: Spiral-Type Vortex Breakdown,” Exp. Fluids, 14, pp. 133–139.
Delery,  J. M., 1994, “Aspects of Vortex Breakdown,” Prog. Aerosp. Sci., 30, No. 1, pp. 1–59.
Akaike,  S., and Kikuyama,  K., 1993, “Noise Reduction of Pressure Type Fans for Automobile Air Conditioners,” ASME J. Vibr. Acoust., 115, pp. 216–220.
Inoue, M., Wu, K-C., Kuroumaru, M., Furukawa, M., Fukuhara, M., and Ikui, T., 1984, “A Design of Diagonal Impeller by Means of SCM and Cascade Data,” Proceedings of China-Japan Joint Conference on Hydraulic Machinery and Equipment, Vol. 1, pp. 21–30.
Sawada,  K., 1995, “A Convenient Visualization Method for Identifying Vortex Centers,” Trans. Japan Soc. of Aero. Space Sci., 38, No. 120, pp. 102–116.

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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