International Journal of Fluid Machinery and Systems

한국유체기계학회 (Korean Society for Fluid machinery)
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A Behavior of the Diffuser Rotating Stall in a Low Specific Speed Mixed-Flow Pump

  • Miyabe, Masahiro (Department of Research and Development, Torishima Pump Mfg. Co., Ltd.) ;
  • Furukawa, Akinori (Department of Mechanical Engineering Science, Kyushu University) ;
  • Maeda, Hideaki (Department of Research and Development, Torishima Pump Mfg. Co., Ltd.) ;
  • Umeki, Isamu (Department of Research and Development, Torishima Pump Mfg. Co., Ltd.) ;
  • Jittani, Yoshinori (Department of Research and Development, Torishima Pump Mfg. Co., Ltd.)
  • 투고 : 2008.07.29
  • 심사 : 2009.01.10
  • 발행 : 2009.03.01
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초록

The flow instability in a low specific speed mixed-flow pump, having a positive slope of head-flow characteristics was investigated. Based on the static pressure measurements, it was found that a rotating stall in the vaned diffuser occurs at about 65% flow rate of best efficiency point (BEP). A dynamic Particle Image Velocimetry (DPIV) measurement and the numerical simulations were conducted in order to investigate the flow fields. As a result, the diffuser rotating stall was simulated even by Computational Fluid Dynamics (CFD) and the calculated periodic flow patterns agree well with the measured ones by DPIV. It is clarified that a periodical large scaled backflow, generated at the leading edge of the suction surface of the diffuser vane, causes the instability. Furthermore, the growth of the strong vortex at the leading edge of the diffuser vane induces the strong backflow from the diffuser outlet to the inlet. The scale of one stall cell is covered over four-passages in total thirteen vane-passages.

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참고문헌

  1. Miyabe, M., Maeda, H., Umeki, I., and Jittani, Y., 2006, “Unstable Head-Flow Characteristic Generation Mechanism of a LowSpecific Speed Mixed Flow Pump,” Journal of Thermal Science, Vol.15, No.2, pp. 115-120. https://doi.org/10.1007/s11630-006-0115-6
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  7. Sinha, M., Pinarbashi, A., and Katz, J., 2001, “The Flow Structure During Onset and Developed States of Rotating Stall with aVaned Diffuser of a Centrifugal Pump,” ASME Journal of Fluids Engineering, Vol.123, pp. 490-499. https://doi.org/10.1115/1.1374213
  8. Kurokawa, J., 1988, “Performance Curve Instability of a Diffuser Pump at Low Flow-Rates (in Japanese),” Trans. JSME,Vol.54, No.508, pp. 3449-3456. https://doi.org/10.1299/kikaib.54.3449
  9. Hayami, H., Okamoto, K., Aramaki, S., and Kobayashi, T., 2003, “Development of a New Dynamic PIV System,” Proc. of the7th International Symposium of Fluid Control, Measurement and Visualization, Sorrento, pp. 1-6.
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  11. Inoue, M., Kuroumaru, M., Tanino, T., and Furukawa, M., 2000, “Propagation of Multiple Short-Length-Scale Stall Cells inan Axial Compressor Rotor,” ASME Journal of Turbomachinery, Vol.122, pp. 45-54. https://doi.org/10.1115/1.555426
  12. Miyabe, M., Furukawa, A., Maeda, H., Umeki, I., and Jittani, Y., 2008, "On Improvement of Characteristic Instability andInternal Flow in Mixed Flow Pumps," Journal of Fluid Science and Technology, Vol.3, No.6, pp. 732-743. https://doi.org/10.1299/jfst.3.732

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