@inproceedings{oai:jaxa.repo.nii.ac.jp:00036952,
 author = {蒔田, 秀治 and 大庭, 勝久 and Makita, Hideharu and Oba, Katsuhisa},
 book = {航空宇宙技術研究所特別資料, Special Publication of National Aerospace Laboratory},
 month = {Sep},
 note = {28-29 Sep. 1995 (17th). 28-29 Mar. 1996 (18th), 28-29 Sep. 1995 (17th). 28-29 Mar. 1996 (18th), 測定胴中に熱成層発生機を持つ風洞の中で実現した、階段状温度分布を有する強安定成層混合層における内部重力波の構造について実験的研究を行った。混合層で発達する速度および温度の変動を熱線温度流速計で測定した。これらの変動のスペクトル成分は3波共鳴条件を満たし、速度および温度変動の垂直成分間の位相差は下流領域で-π/2に近づいた。この結果、内部重力波は混合層の中で自然発生することが分かった。また、熱成層発生機の直後に直径10μmの加熱線を設けて小さな熱的擾乱を与え、内部重力波の遷移過程を制御することも試みた。スペクトル成分のエネルギー密度レベルは混合層で下流方向に急激に増加し、内部重力波の遷移過程の制御が本法により可能であることを確認した。, Structure of internal gravity wave was experimentally studied in a strongly stably-stratified mixing layer with stepwise temperature distribution realized in a wind tunnel with a thermal stratification generator in its settling chamber. Velocity and temperature fluctuations developed in the mixing layer were measured by a hotwire thermo-anemometer. Spectral components of these fluctuations satisfied the requirement for three-wave resonant interaction and the phase difference between the vertical component of the velocity fluctuation and the temperature fluctuation approached -pi/2 in the downstream region. These facts show that internal gravity waves are spontaneously generated in the mixing layer. It was also attempted to control the transition process of the internal gravity wave by giving a small thermal disturbance by installing a heated wire of 10 micrometer in diameter just behind the thermal stratification generator. The energy density levels of the spectral components increased downstream more rapidly in the mixing layer, which confirms the possibility of controlling the transition process of the internal gravity wave by the present method., 資料番号: AA0000867021, レポート番号: NAL SP-33},
 pages = {93--98},
 publisher = {航空宇宙技術研究所, National Aerospace Laboratory (NAL)},
 title = {強安定成層流中の内部重力波の制御},
 volume = {33},
 year = {1996}
}