{"created":"2023-06-20T15:10:19.392617+00:00","id":39906,"links":{},"metadata":{"_buckets":{"deposit":"9448bda2-4b97-4501-80a1-fff16305914d"},"_deposit":{"created_by":1,"id":"39906","owners":[1],"pid":{"revision_id":0,"type":"depid","value":"39906"},"status":"published"},"_oai":{"id":"oai:jaxa.repo.nii.ac.jp:00039906","sets":["1887:1893","1896:1898:1913:1917"]},"author_link":["445591","445590","445589","445588"],"item_3_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"従来型スワーラと新規なダブルスワーラを備えたバーナの旋回乱流流れの数値計算:非燃焼時の流れと燃料濃度分布"}]},"item_3_biblio_info_10":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"1997-01","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"33","bibliographicPageStart":"1","bibliographicVolumeNumber":"1318T","bibliographic_titles":[{"bibliographic_title":"航空宇宙技術研究所報告"},{"bibliographic_title":"Technical Report of National Aerospace Laboratory","bibliographic_titleLang":"en"}]}]},"item_3_description_16":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"バーナ内の乱流と燃料-空気の混合過程に及ぼすスワーラの形態の影響を数値計算により調べた。対象とした形態は、開口面積、羽根角は同じで、ハブ径が異なる2個の従来型スワーラと1個の新規なダブルスワーラ(DS)とである。このダブルスワーラは、同方向旋回の一対のスワーラと縮小ダクトで構成される。1個のスワーラはこのダクトの入り口に、また、他の1個はダクト出口部において、それと同軸に外側から取り付けられていて、燃焼空気はダクトと外側スワーラとから燃焼筒に流入する。これに対して、従来型のスワーラでは、ハブと同軸の環状通路だけから空気が流入する。数値計算には有限体積法を用いた。空気通路が曲面で形成されたダブルスワーラの流れの予測には物体適合非直交格子を生成させた。流れの乱流特性を計算するために3種類の乱流モデル、標準κ-εモデル、RNG(繰り込み群)κ-εモデル、およびReynolds応力モデルを用い、それらの予測性能を比較・評価した。バーナ内の流れ特性と、入り口条件の変化に対するその変化を数値的に分析した。3種類の乱流モデルは、どれもこの研究で対象とした旋回流れの一般的な特性を予測できたが、中心のトロイダル循環流領域(CTRZ)の大きさには、特に下流において、差が生じた。DSバーナの流れについては、実験との比較から、標準κ-εモデルによるCTRZの大きさは実験データと比較的よく合うこと、RNGモデルは強い旋回流れ中の剛体渦運動の予測を改善することができることが分かった。RSM(Reynolds応力モデル)は、従来型スワーラによる剛体渦運動の予測を改善することができることも分かった。流れパターンに与える入り口条件の影響についての研究から、このダブルスワーラは従来型スワーラに比べて特徴的な利点、すなわち、バーナ内の流れパターンと燃料濃度分布が、内・外スワーラへの空気流量比あるいは燃料ノズルの燃料流量を変えることによって制御できることが分かった。ダブルスワーラの出口近傍に高速の噴流が形成され、この噴流と燃焼器内の逆流との対向によって空気と燃料の混合が促進される。従来型スワーラの流れパターンは類似で、スワーラの旋回角が一定なら入口条件によって著しく変化することはなかった。CTRZの大きさはスワーラのハブ径によって変化し、ハブ径が小さいとCTRZも小さかった。","subitem_description_type":"Abstract"}]},"item_3_description_17":{"attribute_name":"抄録（英）","attribute_value_mlt":[{"subitem_description":"In this paper, the effect of swirler configurations on the turbulent flows and fuel-air mixing process in a swirl burner are investigated by numerical simulations. The configurations studied are a unique Double Swirler (DS) which is designed for low-NOx emissions, and two conventional single swirlers with different hub diameters and the same opening area. The double-swirler has a pair of corotational swirls and a convergent duct. One of them is attached to the inlet of the duct and the other is externally and concentrically attached to the duct at the exit. Combustion air flows into a flame tube through both duct and the annular passage of the outer swirler. In the conventional swirlers, combustion air flows through the annular passage with swirl vanes. The study is performed using a finite volume formulation. A body-fitted nonorthogonal grid system is specially generated for predicting flows in the double swirler. In the study, three different turbulent models, e.g., the standard kappa-epsilon model, RNG (Renormalization Group) kappa-epsilon model, and Reynolds Stress Model (RSM), are used to calculate turbulent properties in the flow, and their predictive abilities are assessed and compared to each other. The flow characteristics in the burners and their variations with the inlet flow conditions are then analyzed numerically. The results in this study indicate that these three different turbulent models all give general flow characteristics of the swirling flows considered in this work, but show different predictions of the size of Central Toroidal Recirculation Zone (CTRZ), mainly in the downstream of the flow. The experimental evaluation conducted for the flow in the DS burner indicates that the predicted CTRZ sizes given by the standard kappa-epsilon model show comparatively good agreement with the experiment data, while the RNG kappa-epsilon model predicts the rigid vortex motion in the strongly swirling flow more accurately. It is found from the predictions conducted for the conventional burners that the RSM model is also able to improve the prediction of the rigid vortex motion. The study of the effects of inlet conditions on flow patterns reveals that the double swirler possesses unique advantages over conventional swirlers, e.g., the flow pattern as well as the fuel concentration distribution in the burner could actually be controlled by changing the ratio of the air flow rate in the inner and outer swirlers or the fuel flow rate through the fuel nozzle. A high-velocity jet is produced near the exit of the double swirler, and it may enhance the mixing process of the air and fuel due to opposing effect of the jet and the reverse flow in the burner.","subitem_description_type":"Other"}]},"item_3_description_32":{"attribute_name":"資料番号","attribute_value_mlt":[{"subitem_description":"資料番号: AA0000925000","subitem_description_type":"Other"}]},"item_3_description_33":{"attribute_name":"レポート番号","attribute_value_mlt":[{"subitem_description":"レポート番号: NAL TR-1318T","subitem_description_type":"Other"}]},"item_3_publisher_8":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"航空宇宙技術研究所"}]},"item_3_publisher_9":{"attribute_name":"出版者（英）","attribute_value_mlt":[{"subitem_publisher":"National Aerospace Laboratory (NAL)"}]},"item_3_source_id_21":{"attribute_name":"ISSN","attribute_value_mlt":[{"subitem_source_identifier":"0389-4010","subitem_source_identifier_type":"ISSN"}]},"item_3_text_6":{"attribute_name":"著者所属","attribute_value_mlt":[{"subitem_text_value":"航空宇宙技術研究所"},{"subitem_text_value":"航空宇宙技術研究所 熱流体力学部　反応流体研究室"}]},"item_3_text_7":{"attribute_name":"著者所属（英）","attribute_value_mlt":[{"subitem_text_language":"en","subitem_text_value":"National Aerospace Laboratory"},{"subitem_text_language":"en","subitem_text_value":"National Aerospace Laboratory Reacting Flow Research Laboratory, Thermofluid Dynamics Division"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Liu, Yan"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"林, 茂"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Liu, Yan","creatorNameLang":"en"}],"nameIdentifiers":[{}]},{"creatorNames":[{"creatorName":"Hayashi, Shigeru","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":"2020-01-27"}],"displaytype":"detail","filename":"naltr1318t.pdf","filesize":[{"value":"3.0 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"naltr1318t.pdf","url":"https://jaxa.repo.nii.ac.jp/record/39906/files/naltr1318t.pdf"},"version_id":"f3672d85-7ebd-4d23-a63d-0b695b25f192"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"燃料空気混合","subitem_subject_scheme":"Other"},{"subitem_subject":"従来形スワーラバーナ","subitem_subject_scheme":"Other"},{"subitem_subject":"旋回乱流流れ","subitem_subject_scheme":"Other"},{"subitem_subject":"数値計算","subitem_subject_scheme":"Other"},{"subitem_subject":"乱流モデル","subitem_subject_scheme":"Other"},{"subitem_subject":"有限体積法","subitem_subject_scheme":"Other"},{"subitem_subject":"非直交格子","subitem_subject_scheme":"Other"},{"subitem_subject":"燃料濃度分布","subitem_subject_scheme":"Other"},{"subitem_subject":"流れパターン","subitem_subject_scheme":"Other"},{"subitem_subject":"ダブルスワーラバーナ","subitem_subject_scheme":"Other"},{"subitem_subject":"ハブ付スワーラ","subitem_subject_scheme":"Other"},{"subitem_subject":"乱流混合","subitem_subject_scheme":"Other"},{"subitem_subject":"低NOxバーナ","subitem_subject_scheme":"Other"},{"subitem_subject":"Reynolds応力モデル","subitem_subject_scheme":"Other"},{"subitem_subject":"トロイダル循環流","subitem_subject_scheme":"Other"},{"subitem_subject":"fuel air mixing","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"conventional swirl burner","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"swirling turbulent flow","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"numerical calculation","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"turbulent model","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"finite volume method","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"nonorthogonal grid","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"fuel concentration distribution","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"flow pattern","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"double swirler burner","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"hubed swirler","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"turbulent mixing","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"low NOx burner","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"Reynolds stress model","subitem_subject_language":"en","subitem_subject_scheme":"Other"},{"subitem_subject":"troidal recirculation","subitem_subject_language":"en","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"technical report","resourceuri":"http://purl.org/coar/resource_type/c_18gh"}]},"item_title":"Numerical studies of swirling turbulent flows in conventional and DS burners","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Numerical studies of swirling turbulent flows in conventional and DS burners","subitem_title_language":"en"}]},"item_type_id":"3","owner":"1","path":["1893","1917"],"pubdate":{"attribute_name":"公開日","attribute_value":"2015-03-26"},"publish_date":"2015-03-26","publish_status":"0","recid":"39906","relation_version_is_last":true,"title":["Numerical studies of swirling turbulent flows in conventional and DS burners"],"weko_creator_id":"1","weko_shared_id":1},"updated":"2023-06-20T19:18:16.620973+00:00"}