International Journal of Fluid Machinery and Systems

Korean Society for Fluid machinery (한국유체기계학회)
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A New Blade Profile for Bidirectional Flow Properly Applicable to a Two-stage Jet Fan

  • Nishi, Michihiro (Department of Mechanical Engineering, Kyushu Institute of Technology) ;
  • Liu, Shuhong (Department of Thermal Engineering, Tsinghua University) ;
  • Yoshida, Kouichi (Department of Mechanical Engineering, Kyushu Institute of Technology) ;
  • Okamoto, Minoru (Department of Human Life, Kyushu Women's University) ;
  • Nakayama, Hiroyasu (Department of Mechanical Engineering, Kitakyushu National College of Technology)
  • Received : 2009.09.11
  • Accepted : 2009.10.26
  • Published : 2009.12.01
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Abstract

A reversible axial flow fan called jet fan has been widely used for longitudinal ventilation in road tunnels to secure a safe and comfortable environment cost-effectively. As shifting the flow direction is usually made by only switching the rotational direction of an electric motor due to heavy duty, rotor blades having identical aerodynamic performance for bidirectional flow should be necessary. However, such aerodynamically desirable blades haven't been developed sufficiently, since most of the related studies have been done from the viewpoint of unidirectional flow. In the present paper, we demonstrate a method to profile the blade section suitable for bidirectional flow, which is validated by studying the aerodynamic performances of rotor blades of a two-stage jet fan experimentally and numerically.

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References

  1. Abbot, I.H., and von Doenhoff, A.E., 1949, Theory of Wing Sections, Dover.
  2. Nishioka, T., Terasaka, H., and Kozu, T., 2000, “New Jet Fan for Tunnel Ventilation,” Turbomachinery, Vol. 28, No. 6, pp. 357-363 (in Japanese).
  3. Tukamoto, T., Niikura, Y., and Nishi, M., 1991, “Development of Jet Fans for Tunnel Ventilation,” Aerodynamics and Ventilation of Vehicle Tunnels, pp. 847-858, Elsevier.
  4. Nishi, M., Yoshida, K., Matsuda, I., Yamasaki, K., and Kojima, K., 2002, “Aerodynamic Performance of 2-Stage Jet Fan Having Forced-Vortex-Type Rotor,” Proceedings of 9th International Symposium on Transport Phenomena and Dynamics of Rotating Machinery, Honolulu.