Three-dimensional structures of the vortical flow field in a propeller fan with a shroud covering only the rear region of its rotor tip have been investigated by experimental analysis using laser Doppler velocimetry (LDV) measurements and by numerical analysis using a large eddy simulation (LES) in Part I of the present study. The propeller fan has a very complicated vortical flow field near the rotor tip compared with axial fan and compressor rotors. It is found that three vortex structures are formed near the rotor tip: the tip vortex, the leading edge separation vortex, and the tip leakage vortex. The tip vortex is so strong that it dominates the flow field near the tip. Its formation starts from the blade tip suction side near the midchord. Even at the design condition the tip vortex convects nearly in the tangential direction, thus impinging on the pressure surface of the adjacent blade. The leading edge separation vortex develops close along the tip suction surface and disappears in the rear region of the rotor passage. The tip leakage vortex is so weak that it does not affect the flow field in the rotor.
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December 2001
Technical Papers
Analysis of Vortical Flow Field in a Propeller Fan by LDV Measurements and LES—Part I: Three-Dimensional Vortical Flow Structures
Choon-Man Jang,
e-mail: jang@mech.kyushu-u.ac.jp
Choon-Man Jang
Department of Mechanical Science and Engineering, Kyushu University, Fukuoka, Japan
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Masato Furukawa,
Masato Furukawa
Department of Mechanical Science and Engineering, Kyushu University, Fukuoka, Japan
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Masahiro Inoue
Masahiro Inoue
Department of Mechanical Science and Engineering, Kyushu University, Fukuoka, Japan
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Choon-Man Jang
Department of Mechanical Science and Engineering, Kyushu University, Fukuoka, Japan
e-mail: jang@mech.kyushu-u.ac.jp
Masato Furukawa
Department of Mechanical Science and Engineering, Kyushu University, Fukuoka, Japan
Masahiro Inoue
Department of Mechanical Science and Engineering, Kyushu University, Fukuoka, Japan
Contributed by the Fluids Engineering Division for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received by the Fluids Engineering Division April 28, 2000; revised manuscript received July 21, 2001. Associate Editor: P. Bradshaw.
J. Fluids Eng. Dec 2001, 123(4): 748-754 (7 pages)
Published Online: July 21, 2001
Article history
Received:
April 28, 2000
Revised:
July 21, 2001
Citation
Jang, C., Furukawa , M., and Inoue, M. (July 21, 2001). "Analysis of Vortical Flow Field in a Propeller Fan by LDV Measurements and LES—Part I: Three-Dimensional Vortical Flow Structures ." ASME. J. Fluids Eng. December 2001; 123(4): 748–754. https://doi.org/10.1115/1.1412565
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