International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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Aspect-Ratio Effects and Unsteady Pressure Measurements inside a Cross-Flow Impeller

  • Hirata, Katsuya (Department of Mechanical Engineering, Doshisha University) ;
  • Onishi, Yusuke (Department of Mechanical Engineering, Doshisha University) ;
  • Nagasaka, Shigeya (Department of Mechanical Engineering, Doshisha University) ;
  • Matsumoto, Ryo (Department of Mechanical Engineering, Doshisha University) ;
  • Funaki, Jiro (Department of Mechanical Engineering, Doshisha University)
  • Received : 2012.05.21
  • Accepted : 2012.04.17
  • Published : 2012.09.30
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Abstract

In the present experimental study, the authors try to clarify the characteristics of the flow around and inside a cross-flow impeller in a typical geometry, over a wide parameter range of an aspect ratio $L/D_2$. In order to eliminate the complicated casing factors, the impeller rotates in open space without any casings. As a result, by using hot wire anemometer measurements and by conventional flow visualisations with a particle image velocimetry technique, the authors show that both the outflow rate and the maximum vorticity attain the maximum for $L/D_2$ = 0.6. In order to investigate the aspect-ratio effect, we further reveal minute fluctuating pressures on an impeller end wall for a singular $L/D_2$ = 0.6. Especially in these pressure measurements, the eccentric vortex is prevented to revolute by the insertion of a tongue, in order to consider the spatial structure of flow more precisely.

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References

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