In a low-speed compressor test rig at Kyushu University, multiple short length-scale stall cells appeared under a mild stall condition and turned into a long length-scale cell under a deep stall condition. Then, for the two types of stall cell, the pressure distribution on the casing wall and the velocity distributions upstream and downstream of the rotor have been measured by high-response pressure transducers and a slanted hot-wire, respectively. The time-dependent ensemble-averages of these distributions have been obtained phase-locked to both the rotor and the stall cell rotation using a “double phase-locked averaging technique” developed by the authors. The structures of the two stall cells are compared: The short length-scale stall cell is characterized by a concentrated vortex spanning from the casing wall ahead of the rotor to the blade suction surface. In the long length-scale stall cell, the separation vortices go upstream irregularly when blade separation develops in the front half of the cell, and re-enter the rotor on the hub side in the rear half of it. The unsteady aerodynamic force and torsional moment acting on the blade tip section have been evaluated from the time-dependent ensemble-averages of the casing wall pressure distribution. The force fluctuation due to the short length-scale cells is somewhat smaller than that for the long length-scale cell. The blade suffers two peaks of the force during a period of the short length-scale cells passing through it. The moment fluctuation for the short length-scale cells is considerably larger than that for the long length-scale cell.
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January 2001
Technical Papers
Comparative Studies on Short and Long Length-Scale Stall Cell Propagating in an Axial Compressor Rotor
M. Inoue,
M. Inoue
Department of Energy and Mechanical Engineering, Kyushu University, Fukuoka, Japan
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M. Kuroumaru,
M. Kuroumaru
Department of Energy and Mechanical Engineering, Kyushu University, Fukuoka, Japan
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T. Tanino,
T. Tanino
Department of Energy and Mechanical Engineering, Kyushu University, Fukuoka, Japan
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S. Yoshida,
S. Yoshida
Department of Energy and Mechanical Engineering, Kyushu University, Fukuoka, Japan
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M. Furukawa
M. Furukawa
Department of Energy and Mechanical Engineering, Kyushu University, Fukuoka, Japan
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M. Inoue
Department of Energy and Mechanical Engineering, Kyushu University, Fukuoka, Japan
M. Kuroumaru
Department of Energy and Mechanical Engineering, Kyushu University, Fukuoka, Japan
T. Tanino
Department of Energy and Mechanical Engineering, Kyushu University, Fukuoka, Japan
S. Yoshida
Department of Energy and Mechanical Engineering, Kyushu University, Fukuoka, Japan
M. Furukawa
Department of Energy and Mechanical Engineering, Kyushu University, Fukuoka, Japan
Contributed by the International Gas Turbine Institute and presented at the 45th International Gas Turbine and Aeroengine Congress and Exhibition, Munich, Germany, May 8–11, 2000. Manuscript received by the International Gas Turbine Institute February 2000. Paper No. 2000-GT-425. Review Chair: D. Ballal.
J. Turbomach. Jan 2001, 123(1): 24-30 (7 pages)
Published Online: February 1, 2000
Article history
Received:
February 1, 2000
Citation
Inoue , M., Kuroumaru , M., Tanino , T., Yoshida , S., and Furukawa, M. (February 1, 2000). "Comparative Studies on Short and Long Length-Scale Stall Cell Propagating in an Axial Compressor Rotor ." ASME. J. Turbomach. January 2001; 123(1): 24–30. https://doi.org/10.1115/1.1326085
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Discussion: “Comparative Studies on Short and Long Length-Scale Stall Cell Propagating in an Axial Compressor Rotor” (Inoue, M., Kuroumaru, M., Tanino, T., Yoshida, S., and Furukawa, M., 2001, ASME J. Turbomach., 123, pp. 24–30)
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