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Study o Computational fluid dynamics for Micro Air Vehicle

Research Project

Project/Area Number 16560695
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Aerospace engineering
Research InstitutionJapan Aerospace Exploration Agency

Principal Investigator

TAKAKI Ryoji  Institute of Space and Astronautical Science, Center for Planning and Information Systems, Associate Professor, 宇宙科学研究本部・宇宙科学情報解析センター, 助教授 (90358466)

Project Period (FY) 2004 – 2005
Project Status Completed (Fiscal Year 2005)
Budget Amount *help
¥3,000,000 (Direct Cost: ¥3,000,000)
Fiscal Year 2005: ¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 2004: ¥800,000 (Direct Cost: ¥800,000)
KeywordsComputational Fluid Dynamics / Low Reynolds number flow / Micro Air Vehicle (MAV) / Aerodynamic characteristics / Micro Air Vehicle (MAV)
Research Abstract

The numerical study was conducted on the fluid phenomenon of the low Reynolds number and high Mach number flow, which are typical flows around a small flight vehicle planned to be used in the planetary exploration in the near future. The aerodynamic characteristic in the low Reynolds number flow was analyzed for a typical airfoil (NACA4402). The effect of the Reynolds number and the Mach number, and unsteadiness of the fluid dynamics were analyzed. Moreover, the numerical analysis technique for unsteady flow around moving body was developed in order to investigate flow around flapping wings which are considered to be a highly effective propulsion system in the low Reynolds number flow.
1.Analysis of aerodynamic characteristic of a typical airfoil in the low Reynolds number flow.
(1)Aerodynamic characteristics in the low Reynolds number flow were investigated for a typical airfoil (NACA4402) around Reynolds number 1000. Comparing with usual high Reynolds number flows (for instance, Re=10^ … More 6), the low Reynolds number flow shows following features. The drag of the airfoil becomes larger. The lift-to-drag ratio (L/D) becomes smaller. The stall angle becomes smaller and flow becomes easier to separate Moreover, the dependence of aerodynamic characteristics on the Reynolds number is greater than that on the Mach number, and the great degradation of aerodynamic characteristics and the change of flow separation behavior are occurred on the boundary of a certain Reynolds number.
(2)The flow is easy to separate and unsteadiness is essential in the low Reynolds number flow. However, steady is good in the aerodynamic performance, especially for the value of L/D.
2.Development of numerical analysis technique for the flow around flapping wing
The numerical analysis technique, which can analyze unsteady flow around moving body accurately, was developed in order to analyze flow around flapping wings. The effect of the moving body was considered as the movement of the computational grid according to the movement of the body. A simple test calculation shows that unsteady flow around moving body is correctly calculated. Moreover, the developed program being applied to the flow around the forced oscillating airfoil was validated. Less

Report

(3 results)
  • 2005 Annual Research Report   Final Research Report Summary
  • 2004 Annual Research Report
  • Research Products

    (6 results)

All 2006 Other

All Journal Article (6 results)

  • [Journal Article] 低レイノルズ数流れにおけるNACA4402翼の空力特性解析2006

    • Author(s)
      高木亮治
    • Journal Title

      日本航空宇宙学会論文集 (印刷準備中)

    • NAID

      10019370495

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 低レイノルズ数流れにおける二次元翼型の空力特性解析2006

    • Author(s)
      高木亮治
    • Journal Title

      宇宙航空研究開発機構特別資料(JAXA-SP) 05-017

      Pages: 138-143

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Aerodynamic Characteristics of NACA44O2 in Low Reynolds Number Flows2006

    • Author(s)
      Ryoji Takaki
    • Journal Title

      Journal of the Japan Society for Aeronautical and Space Sciences (to be published)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] Aerodynamic Characteristics of 2D Airfoil in Low Reynolds Number Flows2006

    • Author(s)
      Ryoji Takaki
    • Journal Title

      JAXA Special Publication 05-017

      Pages: 138-143

    • NAID

      120006829424

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2005 Final Research Report Summary
  • [Journal Article] 低レイノルズ数流れにおけるNACA4402翼の空力特性解析

    • Author(s)
      高木亮治
    • Journal Title

      日本航空宇宙学会論文集 (出版準備中)

    • NAID

      10019370495

    • Related Report
      2005 Annual Research Report
  • [Journal Article] 低レイノルズ数流れにおける二次元翼型の空力特性解析

    • Author(s)
      高木亮治
    • Journal Title

      宇宙航空研究開発機構特別資料 (出版準備中)

    • Related Report
      2005 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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