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1996 Fiscal Year Final Research Report Summary

Pilot study on turbulence wind tunnel with numerically controlled multiple fans.

Research Project

Project/Area Number 06555168
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section試験
Research Field Building structures/materials
Research InstitutionUNIVERSITY OF TOKYO

Principal Investigator

KANDA Jun  UNIV.OF TOKYO,GRADUATE SCHOOL OF ENGINEERING,PROFESSOR, 大学院・工学系研究科, 教授 (80134477)

Co-Investigator(Kenkyū-buntansha) YUKI Kuniyuki  EBARA CORPORATION,ENVIRONMENTAL ENGINEERING GROUP,EXECUTIVE OFFICE.FLUID MECHINE, 環境事業本部・プロジェクト第五部, 部長
IWASAKI Ryoji  UNIV.OF TOKYO,GRADUATE SCHOOL OF ENGINEERING,RESEARCH ASSOCIAT, 大学院・工学系研究科, 助手 (60011160)
Project Period (FY) 1994 – 1996
KeywordsMultiple fan control / Large-scale turbulence / Power spectral density / Co-coherence / Time history control
Research Abstract

By controlling six small fans in an vertical array with respective individual servo-motors, turbulent air streams with a large scale correlated in two firections were created in a wind tunnel working section with the height of 600 mm and the wind width of 200 mm. Such a large scale turbulence wind can only be simulated in this type of control system. Major achievements are concluded as follows ;
(1)A control algorithm was developed to create a turbulent wind with a target spectrum, by modifying the input electric voltage time history in terms of the ratios of measured power spectrum to taget one. Root mean square error of 23.6% in the frequency range between 0.0 and 3.5 Hz was achieved.
(2)A control algorithm was developed to create a turbulent wind with a target spectrum and a target co-coherence in the vertical direction, by applying the method mentioned in (1) for the spectrum and by controlling the phase of input electric voltage time history. Root mean square error of 15% was achieved.
(3)Wind pressure experiments were conducted for a square cylinder with the blockage ratio of 10%. The power spectral characteristics showed a special tendency in a low frequency range.
(4)A larger longitudinal turbulence scale than the scale of the wind tunnel can be created.
(5)This wind tunnel with multiple fan control system can be developed further for the simulation of turbulent wind with a three dimensional spectral model.

  • Research Products

    (6 results)

All Other

All Publications (6 results)

  • [Publications] 喜々津 仁蜜: "複数ファン制御による乱流風洞の試作研究" 日本建築学会大会学術講演梗概集. 285-286 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 神田 順: "複数ファン制御による乱流風洞の基礎的研究" 第14回風工学シンポジウム論文集. 245-250 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Jun Kanda: "Flow Simulation by Wind Tunnel with Computer-controled-Multiple Fans" 4-th Asia-Pacific Symposium on Wind Engineering. 14-16 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Hitomitsu Kikitsu, Jun Kanda and Ryoji Iwasaki: ""Pilot study of wind tunnel numerically controlled by multiple fans". (Japanese)." Rep.Annu.Meet.Archit.Inst.Jpn., B-1, Kinki. 139-140 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jun Kanda, Ryoji Iwasaki and Hitomitsu Kikitsu: ""Basic characteristics of wind tunnel controlled by multiple fans".(Japanese)." Proc.14th Natl.Symp.Wind Eng., Tokyo. 245-250 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Jun Kanda: ""Flow simulation by wind tunnel with computer-controlled multiple fans"." 4-th Asia-Pacific Symposium on Wind Engineering. 14-16 (1997)

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

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Published: 1999-03-16  

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