{"created":"2023-06-20T15:03:28.426001+00:00","id":32686,"links":{},"metadata":{"_buckets":{"deposit":"816c53d9-3292-44e4-92bd-3f0cf5cea3c1"},"_deposit":{"created_by":1,"id":"32686","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"32686"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00032686","sets":["1887:1890","1896:1898:1899:1911"]},"author_link":["410865","410866"],"item_9_alternative_title_2":{"attribute_name":"その他のタイトル（英）","attribute_value_mlt":[{"subitem_alternative_title":"Formation and development of the vortex street behind an oscillating airfoil"}]},"item_9_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1982-03","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"77","bibliographicPageStart":"1","bibliographicVolumeNumber":"4","bibliographic_titles":[{"bibliographic_title":"宇宙科学研究所報告"}]}]},"item_9_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"振動翼後流中に発生, 成長する渦列を流速測定, 流れの可視化及び渦糸近似法による数値シミュレーションによって総合的に研究した。流速測定実験では, 回流水路中の振動翼直後の流れ場の流速変動をLDVで測定し, ミニコンシステムを用いて測定データを統計的に処理して, 流速の各成分の変動と渦度変動を求めた。可視化実験では, 電解沈澱法とアルミ粉法によって曳航水槽中の振動翼のまわりの流れ場を可視化した。電解沈澱法によって可視化された渦層模様は無次元振動数と無次元振幅によって4つの型に分けられる。翼後縁からの渦層放出の機構を連続写真と16mm映画で観察し, X-t線図上に示した。振動翼では後縁からの粘性境界層の流出速度が上下面で異なるために, 後縁における停滞や剥離が起こり, 渦層塊が作られる。この渦層塊の放出時刻のずれが塊を中心とする渦列の形成に影響を与え, 渦列の4つの型を作ることがわかった。渦糸近似法でも, このような振動の強さによる渦層模様の変化のあるものが再現された。","subitem_description_type":"Abstract"}]},"item_9_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"The vortex streets observed in the wake of an oscillating airfoil were investigated experimentally using velocity measurements and flow visualization technique as well as numerically using discrete vortex approximation. The periodical velocity variation behind the airfoil oscillating in the water tunnel was measured by Laser Doppler Velocimetry. The contour maps of the velocity components and of the vorticity were obtained after conditional sampling and ensenble averaging of the measured data using a mini-computer system. The vortex sheet patterns in the wake were visualized by electrolysis method and the flow fields around the model in the towing tank were also visualized by aluminum dust method. The vortex sheet patterns behind the heaving model observed by electrolysis method were calssified into 4 groups depending upon the nondimensional frequency and the nondimensional amplitude. The time difference when the boundary layers on the upper and the lower surface were shed into the wake was observed by means of serial still photos and 16 mm movies and the X-t diagrams were composed. Because of the velocity difference between the upper and the lower sheets, one of them tends to be stagnant at the trailing edge and even the trailing edge separation occurs, and the blob of the vortex sheet forms. The viscosity effect on the blob shedding influences on the formation of the vortex street which rolls up around the blob in the wake. Using discrete vortex approximation the formation of the vortex street was numerically simulated, and some of the patterns corresponding to those experimentally observed were obtained.","subitem_description_type":"Other"}]},"item_9_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: SA0166145000","subitem_description_type":"Other"}]},"item_9_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"宇宙科学研究所"}]},"item_9_source_id_21":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0285-2853","subitem_source_identifier_type":"ISSN"}]},"item_9_source_id_24":{"attribute_name":"書誌レコードID","attribute_value_mlt":[{"subitem_source_identifier":"AN00354474","subitem_source_identifier_type":"NCID"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"夏目, 明子"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"NATSUME, Akiko","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":"2020-01-24"}],"displaytype":"detail","filename":"SA0166145.pdf","filesize":[{"value":"6.2 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"SA0166145.pdf","url":"https://jaxa.repo.nii.ac.jp/record/32686/files/SA0166145.pdf"},"version_id":"ac804c02-fe30-42ce-b263-b437cb59763c"}]},"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":"departmental bulletin paper","resourceuri":"http://purl.org/coar/resource_type/c_6501"}]},"item_title":"振動翼による渦列の発生と成長の研究","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"振動翼による渦列の発生と成長の研究"}]},"item_type_id":"9","owner":"1","path":["1890","1911"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"32686","relation_version_is_last":true,"title":["振動翼による渦列の発生と成長の研究"],"weko_creator_id":"1","weko_shared_id":-1},"updated":"2023-06-21T00:26:29.185288+00:00"}