{"created":"2023-06-20T15:07:43.985177+00:00","id":37101,"links":{},"metadata":{"_buckets":{"deposit":"91fba187-be2c-45e5-998b-5d7c64d4ccc5"},"_deposit":{"created_by":1,"id":"37101","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"37101"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00037101","sets":["1887:1891","1896:1898:1913:1915"]},"author_link":["478925","478924"],"item_5_alternative_title_2":{"attribute_name":"その他のタイトル（英）","attribute_value_mlt":[{"subitem_alternative_title":"Enhancement of supersonic mixing"}]},"item_5_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1997-12","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"44","bibliographicPageStart":"41","bibliographicVolumeNumber":"36","bibliographic_titles":[{"bibliographic_title":"航空宇宙技術研究所特別資料"},{"bibliographic_title":"Special Publication of National Aerospace Laboratory","bibliographic_titleLang":"en"}]}]},"item_5_description_14":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）","attribute_value_mlt":[{"subitem_description":"航空宇宙技術研究所 26-28 Mar. 1997 東京 日本","subitem_description_type":"Other"}]},"item_5_description_15":{"attribute_name":"会議概要（会議名, 開催地, 会期, 主催者等）（英）","attribute_value_mlt":[{"subitem_description":"National Aerospace Laboratory 26-28 Mar. 1997 Tokyo Japan","subitem_description_type":"Other"}]},"item_5_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"将来の超音速燃焼ラムジェットエンジンの成功は燃料-気流混合効率に強く依存している。対流マッハ数の増加に従い、圧縮性が混合層の成長を抑制するので、超音速混合を促進するための手法を開発することは重要である。本論文では、圧縮性が乱流渦運動を阻害する仕組やその影響を軽減する方法を調べるため、超音速混合層の成長に関するこれまでの主要な研究結果を分析した。次いで、超音速混合を促進するために流れ方向の渦を用いることを提案し、さらにマッハ数2.4、2.5および4.0の超音速後流の中に縦渦列を導入する実験を実施した。実験結果は大きな総圧損失を伴わずに容易に縦渦を生成させることが可能であることを実証した。実験結果はまた、導入した縦渦が下流においてかなり安定しているが、縦渦形成の段階でも流体を強い連行作用で縦渦内に取り込むことができ、超音速混合の促進に効果的であることを示した。さらに、縦渦(強度、スケール、回転およびスパン方向横配列などの種々の組合せを持つ)の破壊による小スケール渦の生成について考察した。スパン方向横配列における縦渦同士の相互作用、入射した弱い衝撃波と縦渦との相互作用、および縦渦自身の不安定性により縦渦の初期形成の際に縦渦に埋め込まれた小スケール渦列(および/または、より小スケールな縦渦)により縦渦を崩壊に導くことを提案した。殊に、超音速混合ならびに低速混合に対する混合促進の強力な手段として、不安定縦渦を提案した。縦渦性は軸対称性であるが、環状領域上だけに存在する。その渦には低速混合層の様に急激に変曲点不安定性が起る。2次元圧縮性ナビエ・ストークス方程式に基づいて数値シミュレーションを行い、線形および非線形段階における激しい変曲点不安定性を実証した。","subitem_description_type":"Abstract"}]},"item_5_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"The success of future supersonic combustion ramjet engine highly depends on the efficiency of fuel-air mixing. As the compressibility suppresses the growth of mixing layers with increasing the convective Mach number, it is crucial to develop techniques for enhancing supersonic mixing. The present paper first analyzes important previous results for the growth of supersonic mixing layers to see how the compressibility hampers the turbulent vortical motions and how to alleviate the effects. Using streamwise vortices to enhance the supersonic mixing is proposed, and further experiments of introducing the longitudinal vortices into supersonic wakes were conducted at Mach numbers 2.4, 2.5 and 4.0. The experiments verify that streamwise vortices can be easily generated without large total pressure losses. The results also show that although the streamwise vortices introduced are rather stable downstream, a high rate of fluid entrainment into the vortices can be obtained even during their formation stage, indicating the capability of enhancing the supersonic mixing. Further, the generation of small-scale eddies through the breakdown of the streamwise vortices (with various combinations of intensities, scales, rotations and in spanwise row configurations) was considered. It is proposed to cause their breakdown by small scale eddies (and/or smaller scale streamwise vortices) embedded in them at their initial formation by their mutual interaction in spanwise row configuration, by their interaction with incident weak shock waves, and by their own instabilities. In particular, as a powerful means of mixing enhancement for the supersonic mixing as well as for low speed cases, unstable streamwise vortices are proposed. Although their streamwise vorticity is axisymmetric, it exists over an annular region only. Thus the vortex may undergo inflectional instability like low-speed mixing layers. The violent inflectional instabilities at the linear and nonlinear stages have been demonstrated through conducting numerical simulations on the basis of two dimensional compressible Navier-Stokes equations.","subitem_description_type":"Other"}]},"item_5_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: AA0001320011","subitem_description_type":"Other"}]},"item_5_description_33":{"attribute_name":"レポート番号","attribute_value_mlt":[{"subitem_description":"レポート番号: NAL SP-36","subitem_description_type":"Other"}]},"item_5_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"航空宇宙技術研究所"}]},"item_5_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"National Aerospace Laboratory (NAL)"}]},"item_5_source_id_21":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0289-260X","subitem_source_identifier_type":"ISSN"}]},"item_5_source_id_24":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN10097345","subitem_source_identifier_type":"NCID"}]},"item_5_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"大阪府立大学"}]},"item_5_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"Osaka Prefecture University"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"西岡, 通男"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Nishioka, Michio","creatorNameLang":"en"}],"nameIdentifiers":[{}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2020-02-10"}],"displaytype":"detail","filename":"nalsp0036011.pdf","filesize":[{"value":"610.4 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"nalsp0036011.pdf","url":"https://jaxa.repo.nii.ac.jp/record/37101/files/nalsp0036011.pdf"},"version_id":"f45d2d4f-3672-44fb-afc4-b13af78a5a71"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"超音速混合促進","subitem_subject_scheme":"Other"},{"subitem_subject":"縦渦","subitem_subject_scheme":"Other"},{"subitem_subject":"スクラムジェットエンジン","subitem_subject_scheme":"Other"},{"subitem_subject":"燃料気流混合","subitem_subject_scheme":"Other"},{"subitem_subject":"混合層","subitem_subject_scheme":"Other"},{"subitem_subject":"乱流渦運動","subitem_subject_scheme":"Other"},{"subitem_subject":"超音速後流","subitem_subject_scheme":"Other"},{"subitem_subject":"流体連行作用","subitem_subject_scheme":"Other"},{"subitem_subject":"小スケール渦","subitem_subject_scheme":"Other"},{"subitem_subject":"変曲点不安定性","subitem_subject_scheme":"Other"},{"subitem_subject":"ナビエ・ストークス方程式","subitem_subject_scheme":"Other"},{"subitem_subject":"supersonic mixing enhancement","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"streamwise vortex","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"scramjet engine","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"fuel air mixing","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"mixing layer","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"turbulent vortical motion","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"supersonic wake","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"fluid entrainment effect","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"small scale eddy","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"inflectional instability","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Navier Stokes equation","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"jpn"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"conference paper","resourceuri":"http://purl.org/coar/resource_type/c_5794"}]},"item_title":"超音速混合の促進制御","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"超音速混合の促進制御"}]},"item_type_id":"5","owner":"1","path":["1891","1915"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"37101","relation_version_is_last":true,"title":["超音速混合の促進制御"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-20T21:25:58.880982+00:00"}