2022 Fiscal Year Final Research Report
Analysis and modeling of the wing-body boundary layer interaction in aircraft stall phenomenon
Project/Area Number |
20K22379
|
Research Category |
Grant-in-Aid for Research Activity Start-up
|
Allocation Type | Multi-year Fund |
Review Section |
0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
|
Research Institution | Tohoku University |
Principal Investigator |
|
Project Period (FY) |
2020-09-11 – 2023-03-31
|
Keywords | 航空機 / 乱流 / 剥離 / 高レイノルズ数 |
Outline of Final Research Achievements |
Boundary layer interference at the wing-body junction is crucial for predicting the aircraft stall phenomena. Therefore, this study tackled the large-eddy simulation (LES) of a turbulent boundary layer with a side wall to clarify the effects of the interference between the boundary layers. The LES results quantitively show that the secondary vortex caused by the boundary layer interference delays the flow separation at the corner. Also, an improved turbulence model was constructed based on the knowledge from the analysis of the constitutive relation between the Reynolds stress and velocity gradient using the LES results. The improved turbulence model better predicts the secondary vortex and the flow separation at the corner compared to the existing model.
|
Free Research Field |
流体力学
|
Academic Significance and Societal Importance of the Research Achievements |
航空機の失速現象の予測は安全設計上重要であるが、従来の乱流モデルを用いた数値計算では十分な予測が困難であった。本研究は、失速現象に対して大きな役割を持つ翼胴結合部における境界層の剥離に焦点を当て、高忠実乱流シミュレーションにより現象の理解と乱流モデルの改良を目指した。この高忠実乱流シミュレーションにより、翼胴結合部の流れ場で重要となる流体現象を特定することができた。また、本研究で提案された乱流モデルは既存の流体ソルバに容易に実装可能であり、失速現象の予測精度向上に貢献するものであると考えられる。
|