超音速後流からの音波発生機構について

• 滝口, 貴

• 前川, 博

• 渡辺, 大輔

• 松尾, 裕一

• Takiguchi, Takashi

• Maekawa, Hiroshi

• Watanabe, Daisuke

• Matsuo, Yuichi

書誌事項

タイトル別名

• Acoustic wave radiation in a supersonic wake

抄録

A direct numerical simulation of a supersonic wake undergoing transition to turbulence has been performed. The compressible Navier-Stokes are solved to study the acoustic generation mechanism for a Mach 2 wake. High-order upwind-biased compact schemes are used for spatial derivatives and a fourth-order Runge-Kutta scheme for time advancement. Navier-Stokes characteristic boundary conditions are employed in the vertical direction and periodic boundary conditions in the streamwise and spanwise directions for a time-developing DNS. The laminar wake was forced with a combination of the 2-D most unstable mode and a pair of oblique subharmonic unstable modes, which were obtained from linear stability theory for the viscous compressible equations. Forcing with a pair of oblique subharmonic modes yields streamwise/vertical counter rotating vortices in the saddle region of the plane wake. As streamwise/vertical counter rotating vortices evolve outside, their self-induction causes inclined braidlike structures to form in the wake, which are similar to the observations in the experimental supersonic flat plate wake transition. Acoustic waves of the plane wake are generated when two-dimensional rollup structures appear and rotate in a coherent fashion in the wake. 3-D elliptical structures play an important role for sound generation in the plane wake.

資料番号: AA0063154018

レポート番号: JAXA-SP-06-010

収録刊行物

• 宇宙航空研究開発機構特別資料: 航空宇宙数値シミュレーション技術シンポジウム2006論文集 = JAXA Special Publication: Proceedings of Aerospace Numerical Simulation Symposium 2006

  宇宙航空研究開発機構特別資料: 航空宇宙数値シミュレーション技術シンポジウム2006論文集 = JAXA Special Publication: Proceedings of Aerospace Numerical Simulation Symposium 2006 JAXA-SP-06-010 95-100, 2006-12-01

  宇宙航空研究開発機構

キーワード

• 音波
• 超音速後流
• 計算流体力学
• ナビエ・ストークス方程式
• 時間発展
• モーダルエネルギー
• 圧力分布
• 速度分布
• ケルビン-ヘルムホルツ不安定
• 音場
• カルマン渦列
• 渦構造
• 縦渦
• sound wave
• supersonic wake
• computational fluid dynamics
• Navier-Stokes equation
• time development
• modal energy
• pressure distribution
• velocity distribution
• Kelvin-Helmholtz instability
• sound field
• Karman vortex street
• vortex structure
• streamwise vortex

詳細情報

• CRID: 1050011086241894144
• NII論文ID: 120006829365
• NII書誌ID: AA11984031
• ISSN: 1349113X
• Web Site: http://id.nii.ac.jp/1696/00005956/
• 本文言語コード: ja
• 資料種別: conference paper
• データソース種別:
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