Unsteady behavior of leading-edge vortex and diffuser stall in a centrifugal compressor with vaned diffuser

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• 作者：Nobumichi Fujisawa ; Shotaro Hara ; Yutaka Ohta
• 关键词：Centrifugal Compressor ; Vaned Diffuser ; Rotating Stall ; Leading ; edge Vortex ; CFD ; DES
• 刊名：Journal of Thermal Science
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：25
• 期：1
• 页码：13-21
• 全文大小：2,464 KB
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  [4]Iwakiri, K., Furukawa, M., Ibaraki, S., and Tomita, I., (2009), Unsteady and Three-Dimensional Flow Phenomena in a Transonic Centrifugal Compressor Impeller at Rotating Stall, Proceedings of ASME Turbo Expo 2009, Orlando, USA, GT2009-59516.
  [5]Spakovsky, Z. S. and Roduner, C. H., (2007), Spike and Modal Stall Inception in an Advanced Turbocharger Centrifugal Compressor, Proceedings of ASME Turbo Expo 2007, Montreal, Canada, GT2007-27634.
  [6]Ohta, Y., Goto, T., and Outa, E., (2010), Unsteady Behavior and Control of Diffuser Leading-edge Vortex in a Centrifugal Compressor, Proceedings of ASME Turbo Expo 2010, Glasgow, UK,GT2010-22394.
  [7]Fujisawa, N., Hara, S., and Ohta, Y., (2014), Unsteady Behavior of Leading-edge Vortex and Diffuser Stall Inception in a Centrifugal Compressor with Vaned Diffuser, Proceedings of ASME FEDSM 2014, Chicago, USA, FEDSM2014-21242.
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• 作者单位：Nobumichi Fujisawa (1)
  Shotaro Hara (1)
  Yutaka Ohta (2)
  
  1. Graduate School of Fundamental Science and Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
  2. Department of Applied Mechanics and Aerospace Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo, 169-8555, Japan
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mechanics, Fluids and Thermodynamics
  Engineering Fluid Dynamics
  Engineering Thermodynamics and Transport Phenomena
  Chinese Library of Science
  
• 出版者：Science Press, co-published with Springer-Verlag GmbH
• ISSN：1993-033X

文摘

The characteristics of a rotating stall of an impeller and diffuser and the evolution of a vortex generated at the diffuser leading-edge (i.e., the leading-edge vortex (LEV)) in a centrifugal compressor were investigated by experiments and numerical analysis. The results of the experiments revealed that both the impeller and diffuser rotating stalls occurred at 55 and 25 Hz during off-design flow operation. For both, stall cells existed only on the shroud side of the flow passages, which is very close to the source location of the LEV. According to the CFD results, the LEV is made up of multiple vortices. The LEV is a combination of a separated vortex near the leading- edge and a longitudinal vortex generated by the extended tip-leakage flow from the impeller. Therefore, the LEV is generated by the accumulation of vorticity caused by the velocity gradient of the impeller discharge flow. In partial-flow operation, the spanwise extent and the position of the LEV origin are temporarily transmuted. The LEV develops with a drop in the velocity in the diffuser passage and forms a significant blockage within the diffuser passage. Therefore, the LEV may be regarded as being one of the causes of a diffuser stall in a centrifugal compressor. Keywords Centrifugal Compressor Vaned Diffuser Rotating Stall Leading-edge Vortex CFD DES