Measurement of Flow Fields and Aerodynamics of Transonic Three-Dimensional Biplane Using Light Field Optics

2023 Fiscal Year Final Research Report

• Project/Area Number: 21K04495
• Research Category: Grant-in-Aid for Scientific Research (C)
• Allocation Type: Multi-year Fund
• Section: 一般
• Review Section: Basic Section 24010:Aerospace engineering-related
• Research Institution: 防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群)
• Principal Investigator: Kashitani Masashi 防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群), システム工学群, 教授 (80535279)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: 可視化 / 遷音速 / 空力特性 / 風洞試験 / 超音速複葉翼

Outline of Final Research Achievements

In this study, a new flow field visualization technique using a light field camera was investigated as a flow field visualization method, and the possibility of its application to compressible flow was examined. In addition, the effectiveness of flap and stagger was clarified by optical measurement technique as a method of avoiding increased drag due to flow choking between airfoil elements, which is a problem in the acceleration from transonic to supersonic speeds of a Busemann biplane, which is expected to be one of the next generation supersonic aircraft. The experiments were conducted using a shock tube as an intermittent transonic wind tunnel. The results show that the proposed measurement technique is effective in measuring compressible flow, and that the flap and stagger of the Busemann biplane are effective in mitigating flow choking between airfoil elements.

Free Research Field

空気力学

Academic Significance and Societal Importance of the Research Achievements

本研究で提案するライトフィールドカメラを用いたフォーカシングシュリーレン光学系は，これまでの流れ場診断技術では困難であった任意断面の流れ場の奥行方向の可視化画像を定量的に得ることが可能であり，今後の風洞計測技術への適用が期待できる．また，ブーゼマン複葉翼へのスタッガーとフラップの適用は，同翼が遷音速から超音速に加速するときに生じる翼間閉塞による急激な抵抗増大を低減するために有効であることが実験的に明らかになり，同翼を用いた機体設計の基礎的データベースへの貢献が期待できる．