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1998 Fiscal Year Final Research Report Summary

STUDIES OF RECEPTIVITY AND LAMINAR-FLOW-CONTROL PROBLEMS FOR THE LEADING-EDGE-REGION BOUNDARY LAYER OF THREE-DIMENSIONAL WING

Research Project

Project/Area Number 08455465
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Aerospace engineering
Research InstitutionOSAKA PREFECTURE UNIVERSITY

Principal Investigator

NISHIOKA Michio  OSAKA PREFECTURE UNIVERSITY,COLLEGE OF ENGINEERING,PROFESSOR, 工学部, 教授 (60081444)

Co-Investigator(Kenkyū-buntansha) SAKAUE Shoji  OSAKA PREFECTURE UNIVERSITY,COLLEGE OF ENGINEERING,RESEARCH ASSOCIATE, 工学部, 助手 (70244655)
ITOH Nobutake  NATIONAL AEROSPACE LABORATORY, 空力性能部, 室長
Project Period (FY) 1996 – 1998
Keywords3D boundary layer / Supersonic wing boundary layer / Attachment-line boundary layer / Laminar flow control / Boundary layer instability / Boundary layer receptivity / Crossflow instability / Subcritical transition
Research Abstract

It is a technological challenge posed by the next generation supersonic transport to reduce the skin friction drag and to realize a high L/D ratio above 10 at supersonic cruising. For this purpose it has been proposed to apply laminar flow control (LFC) for the wing boundary layer. To achieve such LFC we have to develop much fundamental knowledge on the receptivity and instability of supersonic boundary layer growing in the leading edge region. This is exactly the motivation of our numerical and experimental studies. Through investigating the supersonic receptivity and instability problems we obtained the following results. Numerically the receptivity of the supersonic boundary layer (at a free-stream Mach number 2.2) is found to be very week, with the excited amplitude of TS wave being as low as 1/10 compared with the corresponding incompressible case. By disturbing the boundary layer near the attachment-line of a swept wing (with swept angle 60 to 70 degrees) in Mach 2.5 free-stream it is numerically shown that streamwise vortices of cross-flow instability type appear with the highest growth. For the case of a Mach 2.5 flat-plate boundary layer disturbed by strong periodic jets from wall orifice we learned numerically that hairpin vortices develop like in low-speed boundary layers, suggesting the occurrence of the non-linear subcritical transition. We made careful experiments to clarify how the acceleration can suppress the subcritical transition and found that the critical Reynolds number (based on momentum thickness) for the subcritical transition increases from 120 for the flatplate flow to 300 for a low-speed boundary layer with a non-dimensional favorable pressure gradient, -4.5x10^<-3>, which being scaled with the dynamic pressure and momentum thickness. It is also stressed that we found the instability due to streamline curvature to exist in the leading edge region of a swept wing in addition to the cross flow instability.

  • Research Products

    (50 results)

All Other

All Publications (50 results)

  • [Publications] 坂上・西岡: "超音速境界層におけるT-S波動の挙動." 日本流体力学会誌,ながれ. 15・2. 116-123 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂上・西岡: "圧縮斜面周りの超音速境界層におけるT-S波動の挙動." 日本流体力学会誌,ながれ. 15・2. 124-132 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂上・西岡: "前向きステップを過ぎる超音速境界層におけるT-S波動の挙動." 日本流体力学会誌,ながれ. 15・別冊. 41-42 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Asai,M.,Aiba,K & Nishioka,M: "A Nonlinearity-coupled receptivity process generating a T-S wave behind a backward-facing step." Fluid Dynamics Research. 17. 225-236 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Asai,M.,Sawada,K & Nishioka,M: "Development of turbulent patch in a subcritical boundary layer transition." Fluid Dynamics Research. 18. 151-164 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itho,N.: "Streamline-curvature instability of three-dimensional boundary layers,I. A theoretical model for multiple instability." Trans,Japan Soc.Aero.Sci.39. 43-〓 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itho,N.: "Streamline-curvature instability of three-dimensional boundary layers, II. Stability estimation of the flow on a yawed elliptic cylinder." Trans,Japan Soc.Aero.Sci.39. 60-73 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itho,N.: "Simple cases of the streamline-curvature instability in three-dimensional boundary layers." Journal of Fluid Mechanics. 317. 129-154 (1996)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Asai M.& Nishioka M.: "Development of wall turbulence structure in transitional flows." Proceedings of the XIXth ICTAM,1996. 121-138 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sakaue S.& Nishioka M.: "On the Receptivity Process Generating Tollmien-Schlichting Waves in Supersonic Laminar Boundary Layer." Proceedings of the Seventh Asian Congress of Fluid Mechanics. 271-274 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂上・西岡: "超音速境界層の受容性に関する数値実験." 日本流体力学会誌,ながれ. 16・別冊. 241-242 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂上・西岡: "後向きステップを過ぎる超音速境界層におけるT-S波動の挙動." 日本流体力学会誌,ながれ. 16・別冊. 243-244 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西岡・坂上・遠藤: "加速層流境界層におけるヘアピン渦の挙動." 日本流体力学会誌,ながれ. 16・別冊. 283-284 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂上・西岡: "超音速圧縮・膨張斜面境界層におけるT-S波動の挙動." 航空宇宙技術研究所特別資料. SP-34. 239-244 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itho,N.: "Development of an axisymmetric wavepacket in rotating-disk flow." Fluid Dynamics Research. 21. 87-100 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takagi S & Itoh N.: "Characteristics of unsteady disturbances due to streamline-cuvature instability in a rotating-disk flow." Proceedings of the Seventh Asian Congress of Fluid Mechanics. 187-190 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tokugawa N.,Takagi S.& Itoh N.: "Disturbance growth due to streamline-curvature instability from a point source in a yawed-cylinder boundary layer." Proceedings of the Seventh Asian Congress of Fluid Mechanics. 191-194 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂上・西岡: "超音速境界層におけるT-S波動の受容性について." 航空宇宙技術研究所特別資料. SP-35. 17-20 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 坂上・西岡: "超音速境界層のマッハ波に対する受容性の数値実験." 日本流体力学会誌,ながれ. 17・別冊. 173-174 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 西岡・井野・坂上: "加速境界層における亜臨界遷移." 日本流体力学会誌,ながれ. 17・別冊. 171-172 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Takagi.S.& Itoh N.: "Dispersive evolution of crossflow disturbances excited by an airjet column in a three-dimensional boundary layer" Fluid Dynamics Research. 22. 25-42 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itoh N.: "Theoretical description of instability waves in the flow on a rotating disk,I.False-expansion method appiied to linear stability equations." Trans.Japan Soc.Aero.Space Sci.40. 267-279 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Itoh N.: "Theoretical description of instability waves in the flow on a rotating disk, II. Development of wedge-shaped disturbances." Trans.Japan Soc.Aero.Space Sci.40. 280-292 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Asai M.& Nishioka M.: "Three-dimensional growth of Tollmien-Schlichting waves excited at two frequencies." Fluid Dynamics Research. 22. 215-〓 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Sakaue S.& Nishioka M.: "Numerical study on the receptivity of supersonic laminar boundary layer." International CFD Workshop for Super-Sonic Transport Design 1998. 56-61 (1998)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] S.Sakaue and M.Nishioka: "A Numerical Study of Tollmien-Schlichting Waves in Supersonic Laminar Boundary Layer." J.Japan Soc.Fluid Mech.Vol.15. 116-123 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Sakaue and M.Nishioka: "A Numerical Study of Tollmien-Schlichting Waves in Supersonic Laminar Boundary Layer past Compression Ramp." J.Japan Soc.Fluid Mech.Vol.15. 124-132 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Sakaue and M.Nishioka: "Behavior of T-S Wave in Supersonic Laminar Boundary Layer past Forward-facing Step." J.Japan Soc.Fluid Mech.Vol.15 Suppl.41-42 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Asai, K.Aiba and M.Nishioka: "A Nonlinearity-coupled Receptivity Process Generating a T-S Wave behind a Backward-facing Step." Fluid Dynamics Research. Vol.17. 225-236 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Asai, K.Aiba and M.Nishioka: "Developmento of Turbulent Patch in a Subcritical Boundary Layer Transition." Fluid Dynamics Research. Vol.18. 151-164 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Itoh: "Streamline-curvature instability of Three-dimensional Boundary Layer, II.A Theoretical Model for Multiple Instability." Trans.Japan Soc.Aero.Space Sci.Vol.39. 43-59 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Itoh: "Streamline-curvature instability of Three-dimensional Boundary Layer, II.Stability Estimation of the Flow on a Yawed Elliptic Cylinder." Trans.Japan Soc.Aero.Space Sci.Vol.39. 60-73 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Itoh: "Simple Cases of Streamline-curvature Instability in Three-dimensional Bounday Layer." J.Fluid Mech.Vol.317. 129-154 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Asai and M.Nishioka: "Development of Wall Turbulence Structure in Transitional Flows." Proc.of the XIXth ICTAM. 1996. 121-138 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Sakaue and M.Nishioka: "On the Receptivity Process Generating Tollmien-Schlichting Waves in supersonic Laminar Boundary Layer" Proc.7th Asian Congress of Fluid Mech.271-274 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Sakaue and M.Nishioka: "A Numerical Study on the Receptivity Process in Supersonic Laminar Boundary Layer." J.Japan Soc.Fluid Mech.Vol.16 Supl.241-242 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Sakaue and M.Nishioka: "Behavior of T-S Wave in Supersonic Laminar Boundary Layer past Backward-facing Step." J.Japan Soc.Fluid Mech.Vol.16 Supl.243-244 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Nishioka, S.Sakaue and A.Edo: "Behavior of Hairpin Vortices in Accelerated Laminar Boundary Layer" J.Japan Soc.Fluid Mech.Vol.16 Supl.283-284 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Sakaue and M.Nishioka: "Tollmien-Schlichting Waves in Supersonic Laminar Boundary Layer under the Effects of Compression and Expansion." National Aerospace Laboratory. SP-34. 239-244 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Itoh: "Development of an Axisymmetric Wavepacket in Rotating-disk Flow." Fluid Dynamics Research. Vol.21. 87-100 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Takagi and N.Itoh: "Characteristics of Unsteady Disturbances due to Streamline-curvature Instability in a Rotating-disk Flow." Proc.7th Asian Congress of Fluid Mech.187-190 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Tokugawa, S.Takagi and N.Itoh: "Disturbance Growth due to Streamline-curvature Instability from a Point Source in a Yawed-cylinder Boundary Layer." Proc.7th Asian Congress of Fluid Mech.191-194 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Sakaue and M.Nishioka: "A Numerical Study on the Receptivity Process Generating Tollmien-Schlichting Waves in Supersonic Laminar Boundary Layer." National Aerospace Laboratory. SP-35. 17-20 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Sakaue and M.Nishioka: "A Numerical Study on the Supersonic Boundary Layer Receptivity to Mach Wave." J.Japan Soc.Fluid Mech.Vol.17 Supl.173-174 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Nishioka, S.Ino and S.Sakaue: "Subcritical Transition in Accelerating Boundary Layer." J.Japan Soc.Fluid Mech.Vol.17 Supl.173-174 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Takagi and N.Itoh: "Dispersive Evolution of Crossflow Disturbances Excited by an Airjet Column in a Three-dimentional Boundary Layer." Fluid Dynamics Research. Vol.22. 25-42 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Itoh: "Theoretical Description of Instability Waves in the Flow on a Rotating Disk, I.False-expansion Method Applied to Linear Stability Euqations." Tran.Japan Soc.Aero.Space Sci.Vol.40. 267-279 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] N.Itoh: "Theoretical Description of Instability Waves in the Flow on a Rotating disk, II.Development of Wedge-shaped Disturbances." Tran.Japan Soc.Aero.Space Sci.Vol.40. 280-292 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] M.Asai and M.Nishioka: "Three-dimensional Growth of Tollmien-Schlichting Waves Excited at Two Frequencies" Fluid Dynamics Research. Vol.22. 215-230 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] S.Sakaue and M.Nishioka: "Numerical Study on the Receptivity of Supersonic Laminar Boundary Layer" Int.CFD Workshop for Super-Sonic Transport Design. 1998. 56-61 (1998)

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

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Published: 1999-12-08  

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