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1991 Fiscal Year Final Research Report Summary

Active control of noise generated from axial-flow turbomachinery

Research Project

Project/Area Number 02650125
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field Fluid engineering
Research InstitutionInstitute of Engineering Mechanics, University of Tsukuba

Principal Investigator

MATSUUCHI Kazuo  Inst. Eng. Mech., Univ. Tsukuba, Associate Professor, 構造工学系, 助教授 (70111367)

Co-Investigator(Kenkyū-buntansha) ADACHI Tsutomu  Inst. Eng. Mech., Univ. Tsukuba, Professor, 構造工学系, 教授 (50029394)
Project Period (FY) 1990 – 1991
KeywordsTurbomachinery / Rotor-stator interaction / Active control / Mode coupling
Research Abstract

Our experiments are divided into two parts. One is concerned with the fundamental features of pressure fluctuations in the stage which is important in handling the noise. The other is the active control of the noise by adding sound pressure with loud speakers.
The main results of the former experiment are summarized as follows :
1. The magnitude of the pressure fluctuation, the intensity of the cross-spectrum and the sound pressure level vary similarly for the change of flow rates. This means that the fluctuation is closely related to the generated noise.
2. The pressures on a rotor blade fluctuate in phase and have almost the same magnitude over a blade. Such a remarkable feature cannot be explained by the existing theories.
3. As a reason for this, it is assumed that compressibility plays a part due to high unsteadiness.
The latter experiment was done to know the usefulness of active control and also to obtain the fundamental data. The result shows that our approach to the active control is much effective. The main results are as follows :
1. The reduction of overall noise was obtained by about 11 dB and that corresponding to the blade passing frequency by about 23 dB.
2. The phase and the amplitude of sound pressure added by loud speakers coincide with those predicted by the theory.

  • Research Products

    (5 results)

All Other

All Publications (5 results)

  • [Publications] 平山 茂: "左力変動のモ-ド変換による軸流送風機騒音の低減" 日本機械学会流体工学部門講演会講演論文集. 910. 260-262 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松内 一雄: "外部加音による軸流送風機騒音の制御" 筑波大学変換技術開発特別プロジェクト研究報告. 4. 142-147 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kazuo Matsuuchi: "Pressure Fluctuation on Rotor Blade Surface and Generation of Noise in Axial-Flow Turbomachinery" Proc. 1991 YOKOHAMA Gas Turbine Congress. 2. 109-115 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 松内 一雄: "軸流送風機翼列干渉騒音の能動制御" 第11回流力騒音シンポジウム予稿集. (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Kazuo Matsuuchi: "Pressure Fluctuation on Rotor Blade Surface and Generation of Noise in Axial-Flow Turbomachinery" Proc. 1991 YOKOHAMA Int. Gas Turbine Congr.2. 105-115 (1991)

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

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Published: 1993-03-16  

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