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1992 Fiscal Year Final Research Report Summary

STEADY AND UNSTEADY AERODYNAMIC CHARACTERISTICS OF SUPERSONIC THROUGH-FLOW FAN CASCADE

Research Project

Project/Area Number 03452099
Research Category

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

Allocation TypeSingle-year Grants
Research Field Aerospace engineering
Research InstitutionKYUSHU UNIVERSITY

Principal Investigator

NAMBA Masanobu  Kyushu Univ.,Dept. of Aeronautical Engrg., Professor, 工学部, 教授 (50037735)

Co-Investigator(Kenkyū-buntansha) TOSHIMITU Kazuhiko  ibid., ibid., 工学部, 助手 (10180150)
NOTOMI Tetsuo  ibid., Research Associate, 工学部, 助手 (20037914)
YAMASAKI Nobuhiko  Kyushu Univ.,Dept. of Aeronautical Engrg., Associate Professor, 工学部, 助教授 (70166635)
Project Period (FY) 1991 – 1992
KeywordsSupersonic Through-Flow Fan / Cascade Performance / Unsteady Aerodynamics / Cascade Flutter / Rotating Cascade / Compressible Flow / Three-Dimensional Flow / Lifting Surface Theory
Research Abstract

・The computation program to predict the steady performance of a supersonic through-flow fan on the basis of the linearized three-dimensional steady lifting surface theory for a rotating annular cascade was developed. A parametric study of the steady performance in correlation with the axial Mach number, rotating speed, boss ratio, number of blades and blade profile was conducted.
・The computation program to predict the unsteady aerodynamic characteristics of a supersonic through-flow fan on the basis of the Iinearized three-dimensional unsteady lifting surface theory for a rotating annular cascade was developed. A parametric study of the aerodynamic instability of blade vibration in correlation with design parameters was conducted. The pure bending motion under zero mean loading is always aerodynamically damped. The aerodynamic instability of pure torsional motion is heavily dependent on the location of the torsion axis and the interblade phase angle.
・The computation programs on the bas … More is of the three-dimensional double linearization theory for linear and rotating annular cascades with supersonic axial velocity were developed to predict the unsteady aerodynamic characteristics of cascading blades vibrating under nonzero mean loading. It is found that the single-degree-of-freedom pure bending flutter can occur due to nonzero mean loading. The aerodynamic exciting force is very sensitive to the blade camber on which the steady loading is heavily dependent.
・The computation program on the basis of the nonlinear Euler equation to predict the nonlinear steady flow through a two-dimensional cascade with a supersonic leading edge locus was developed. Comparison of the numerical results with those by the linearized theory was conducted. The linearized theory can predict the steady lift force within 10% accuracy at small incidence angles, but the deviation becomes significant as the incidence increases. The main reason of the difference is inaccurate prediction of location of shock wave reflections.
・The measurement system including the Mach-Zehnder interferometer and the image processing system have been constructed. The technology of processing interferograms is being developed. Less

  • Research Products

    (10 results)

All Other

All Publications (10 results)

  • [Publications] 難波 昌伸: "Lifting Surface Theory for Supersonic Through-Flow Fan" Proceedings of the International Symposium on Air Breathing Engines. 1. 669-677 (1991)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 難波 昌伸: "Unsteady Lifting Surface Theroy for Supersonic Through-Flow Fan" Proceedings of the 6th International Symposium on Unsteady Aerodynamics,Aeroacoustics and Aeroelasticity of Turbomachines and Propellers. (1993)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 難波 昌伸: "回転揚力面理論による超音速軸流速度ファンの性能解析第1報、じょう乱場の表現と積分方程式の解法" 日本機械学会論文集(B編). 58. 1142-1149 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 難波 昌伸: "回転揚力面理論による超音速軸流速度ファンの性能解析第2報、性能評価" 日本機械学会論文集(B編). 58. 1150-1157 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 難波 昌伸: "超音速軸流速度分ファンに関する非定常揚力面理論" 日本機械学会論文集(B編). 58. 2757-2764 (1992)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Namba,M.: "Lifting Surface Theory For Supersonic Through-Flow Fan" Proceedings of the 10th International Symposium on Air Breathing Engines. Vol.1. 669-677 (1991)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Namba,M.: "Unsteady Lifting Surface Theory for Supersonic Through-Flow Fan" Proceedings of the 6th International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines and Propellers. (1993)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Namba,M: "Performance Analysis of Supersonic Through-Flow Fan by the Lifting Surface Theory, (1st Report, Disturbance Flow Field and Determination of Blade Loadings)" Trans. Jpn. Soc. Mech. Eng.58-548(B). 1142-1149 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Namba,M.: "Performance Analysis of Supersonic Through-Flow Fan by the Lifting Surface Theory, (2nd Report, Parametric Study)" Trans. Jpn. Soc. Mech. Eng.58-548(B). 1150-1157 (1992)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Namba,M.: "Unsteady Lifting Surface Theory for Supersonic Through-Flow Fan" Trans. Jpn. Soc. Mech. Eng.58-553(B). 2757-2764 (1992)

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

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Published: 1994-03-24  

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