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2002 Fiscal Year Final Research Report Summary

Analysis of Aerodynamic Performance of Rotor Blade for a Reversible Axial Flow and Its Application to Jet Fan

Research Project

Project/Area Number 13650186
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Fluid engineering
Research InstitutionKyushu Institute of Technology

Principal Investigator

NISHI Michihiro  Kyushu Institute of Technology, Faculty of Engineering, Professor, 工学部, 教授 (80038588)

Co-Investigator(Kenkyū-buntansha) YOSHIDA Kouichi  Kyushu Institute of Technology, Faculty of Engineering, Research Associate, 工学部, 助手 (00274548)
Project Period (FY) 2001 – 2002
KeywordsAxial Fan / Jet Fan / Tunnel Ventilation / Reversible Flow / Rotor Performance / Vortex Type / Aerodynamic Noise
Research Abstract

A jet fan is a reversible axial flow fan fitted with upstream and downstream cylindrical silencers and has been used in a vehicle tunnel for longitudinal ventilation and safety measure to suppress the fire spreading in case of car accident. To secure more favorable vehicle tunnels, which should be planned based on minimizing the cost at construction and the energy consumption at operation, improvement of jet-fan performance is strongly expected. For switching flow direction promptly, a method to drive a rotor in the opposite direction is almost always adopted due to reliability. However, a rotor blade that gives high aerodynamic performance for both flow directions is still unclear, because it has been developed under the one-way flow.
The purposes of present research for two years are to investigate the performance of a rotor blade associated with its geometry by using the CFD, and to evaluate the performance of a jet fan with rotor developed based on the CFD experimentally. In the fir … More st year, we confirmed that thin trailing edge is the most desirable among many parameters for camber-less blade section. Then, we designed a two stage jet fan, considering those factors such as blade load, noise, etc. We also paid attention to the vortex type of rotor blade, and selected peripheral component of absolute velocity being constant in the radial direction together with the forced vortex type. We conducted performance test of a proposed jet fan of 630 dia. Since the stand-alone test is necessary for a jet fan, an array of eight 3-holePitot tubes mounted on rotatable support was used to measure the air flow at the exit plane associated with rotational speed and blade setting angle as major parameters. From the test, we can see better jet-fan performance was achieved. Regarding the fan noise, as a typical example, sound pressure level was less than 90 dB even at the exit side under the shorter silencer of around 10%. Distributions of velocity and pressure at each plane upstream and downstream of rotors were also measured, and the corresponding results shows that the proposed vortex type is proper for a 2 stage jet fan having high aerodynamic performance. Further, we confirmed that the turbulent flow analysis was reasonably usable to predict the flow through a jet fan. Less

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 西 道弘: "円筒形エアインテークの圧力損失とその低減法"ターボ機械. 29. 730-735 (2001)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Michihiro NISHI: "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. FD1071-1-FD1071-5 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西 道弘: "損失と不安定現象"日本機械学会RC178非定常・不安定流動の制御・省エネ実用化研究分科会報告. 190-195 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Xiaomin LIU: "Time Averaged Flow in a Conical Diffuser with Vortex Generator Jets"Proceedings of 4th International conference on Pumps and Fans. 18-27 (2002)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西 道弘: "2段ジェットファンの流力性能に関する研究(対称翼を動翼に用いた場合)"日本機械学会九州支部総会講演会講演論文集. 129-130 (2003)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Nishi,M., Yoshida,K., Matsunaga,M., and Kikirikura,Y.: "Pressure Loss of a Cylindrical Air Intake and its Reduction"Turbomachinery. 29-12. 730-735 (2001)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nishi,M., Yoshida,K., Matsuda,I., Yamasaki,K., and Kojima,K.: "Aerodynamic Performance of 2-Stage Jet Fan Having Forced-Vortex Type Rotor"Proceedings of the 9^<th> International Symposium on Transport Phenomena and Dynamics of Rotating. FD107. 1-5 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nishi,M.: "Losses and Unsteady Phenomena"JSME RC178 Report. 190-195 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Liu,X., Nishi,M., Yoshida,K., and Kishi,T.: "Time Averaged Flow in a Conical Diffuser with Vortex Generator Jets"Proceedings of 4^<th> International Conference on Pumps and Fans. 18-27 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Nishi,M., Yoshida,K., Kojima,K., and Ishii,H.: "Aerodynamic Performance a of 2 Stage Jet Fan (Usage of a rotor with Symmetric blades)"JSME Proceedings of Kyushu Branch Annual Meetings. 129-130 (2003)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 2004-04-14  

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