Gunma University
Gunma University
Institute of Aeronautical Technology, Japan Aerospace Exploration Agency (JAXA)
Institute of Aeronautical Technology, Japan Aerospace Exploration Agency (JAXA)
Gunma University
Gunma University
出版者
日本航空宇宙学会
出版者（英）
The Japan Society for Aeronautical and Space Sciences
雑誌名
日本航空宇宙学会論文集
雑誌名(英)
Journal of the Japan Society for Aeronautical and Space Sciences
巻
63
号
2
ページ
53(17) - 59(23)
発行年
2015-04-05
抄録（英）
In a previous study, the authors proposed slit injection as a jet noise suppressor for the Pre-cooled Turbojet Engine, and the noise reduction performance was examined experimentally. Using the slit injection, the noise radiation decreased. It was implied that, by using the slit injection, the instability of the jet was suppressed due to the deformation of the velocity profile of the jet. In this study, the effect of the deformation of the velocity profile of the jet by using the slit injection on the instability of the jet was investigated numerically. The velocity profiles were given by the results of a Pitot tube measurement. The stability of the jet was investigated using the linear stability analysis. The numerical results were compared with the jet noise spectra obtained experimentally. It was found that, by using the slit injection, the instability of the main jet oscillation mode, which may contribute to the noise radiation, was suppressed due to the mitigation of the steep velocity gradient of the main jet shear layer.
内容記述
形態: 図版あり
内容記述（英）
Physical characteristics: Original contains illustrations
スリット噴射が極超音速ノズルから噴出する超音速噴流の不安定性に及ぼす影響
