Development of 3D-BOS using Mirror for three-dimensional flow field measurement near a wall

2022 Fiscal Year Final Research Report

• Project/Area Number: 20K14645
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 19010:Fluid engineering-related
• Research Institution: The University of Tokyo
• Principal Investigator: Masahito Akamine 東京大学, 大学院工学系研究科(工学部), 助教 (00835465)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 流体計測 / 三次元密度計測 / 3D-BOS

Outline of Final Research Achievements

This study proposed a new measurement method, 3D-BOS using Mirror, that enables three-dimensional density field measurement near a wall, which has been difficult in the past. By using a wall surface as a mirror, the light path from multiple directions, which is necessary for density field reconstruction, can be unobstructed by the wall. The proposed method was formulated as an extension of the conventional 3D-BOS, validated using a virtual model data, and demonstrated using a candle plume near a wall.

Free Research Field

流体力学

Academic Significance and Societal Importance of the Research Achievements

本研究により，3D-BOS法による三次元密度場計測がこれまで困難であった壁面近くの計測が可能となり，適用範囲が拡大した．これにより，例えば遷音速バフェット，衝撃波-境界層干渉，そして衝突ジェットといった様々な壁面近くの流れ場において，衝撃波や剪断層に伴う密度場の計測が期待される．なかでも衝突ジェットの計測は，ロケット打上げ時の騒音発生メカニズムの理解とモデル化につながる．