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A criterion that the transmittance of light be more than 50% for a reliable measurement restricted water injection flow rates to less than 10g/s. Bi-modal distribution of diffracted light energy also impeded measurements at high ingection mass ratios of liquid to gas((imjection)ml/(imjection)mg). The drop sizes increased with the distance from the injectors and spray axis. The drop sizes on the spray axis had their local maximum with a high injection gas velocity and their minimum with a low injection gas velocity. The minimum dorp size of Dp,min =5.8μm used in the drop size distribution gave ratios of the Sauter mean diameter to the mass median diameter consistent with other studies. The writer tentatively proposes three regimes of atomisation : (1) (imjection)ml/(imjection)mg \u003c 0.2 where the relative velocity between liquid and gas determines drops sizes, (2) 0.2 \u003c (imjection)ml/(imjection)mg \u003c 1 where the relative velocity and (imjection)ml/(imjection)mg determine drops sizes, (3) 1 \u003c (imjection)ml/(imjection)mg where many parameters affect drop sizes, and assumes that the regimes fo atomisation depend on the length of the atomising region relative to the “potential core” length of the annular gas jet.", "subitem_description_type": "Other"}]}, "item_3_description_32": {"attribute_name": "資料番号", "attribute_value_mlt": [{"subitem_description": "資料番号: NALTR0888000", "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-888T", "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_34": {"attribute_name": "メタデータ提供者", "attribute_value_mlt": [{"subitem_text_value": "メタデータ提供者: NAL-MATCH"}]}, "item_3_text_35": {"attribute_name": "JAXAカテゴリ", "attribute_value_mlt": [{"subitem_text_value": "JAXAカテゴリ: 航空宇宙技術研究所"}]}, "item_3_text_36": {"attribute_name": "JAXAカテゴリ2", "attribute_value_mlt": [{"subitem_text_value": "JAXAカテゴリ2: AP"}]}, "item_3_text_43": {"attribute_name": "DSpaceコレクション番号", "attribute_value_mlt": [{"subitem_text_value": "DSpaceコレクション番号: 9"}]}, "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"}]}, "item_3_text_7": {"attribute_name": "著者所属(英)", "attribute_value_mlt": [{"subitem_text_language": "en", "subitem_text_value": "National Aerospace Laboratory(NAL)"}]}, "item_creator": {"attribute_name": "著者", "attribute_type": "creator", "attribute_value_mlt": [{"creatorNames": [{"creatorName": "五味, 広美"}], "nameIdentifiers": [{"nameIdentifier": "473130", "nameIdentifierScheme": "WEKO"}]}, {"creatorNames": [{"creatorName": "GOMI, Hiromi", "creatorNameLang": "en"}], "nameIdentifiers": [{"nameIdentifier": "473131", "nameIdentifierScheme": "WEKO"}]}]}, "item_files": {"attribute_name": "ファイル情報", "attribute_type": "file", "attribute_value_mlt": [{"accessrole": "open_date", "date": [{"dateType": "Available", "dateValue": "2020-01-29"}], "displaytype": "detail", "download_preview_message": "", "file_order": 0, "filename": "naltr0888t.pdf", "filesize": [{"value": "3.7 MB"}], "format": "application/pdf", "future_date_message": "", "is_thumbnail": false, "licensetype": "license_free", "mimetype": "application/pdf", "size": 3700000.0, "url": {"label": "naltr0888t.pdf", "url": "https://jaxa.repo.nii.ac.jp/record/45146/files/naltr0888t.pdf"}, "version_id": "e5b98ae7-b554-4b93-b6d3-0ba50dbdf870"}]}, "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": "PNEUMATIC ATOMISATION WITH COAXIAL INJECTORS : Measurements of Drop Sizes by the Diffraction Method and Liquid Phase Fraction by the Attenuation Method of Light", "item_titles": {"attribute_name": "タイトル", "attribute_value_mlt": [{"subitem_title": "PNEUMATIC ATOMISATION WITH COAXIAL INJECTORS : Measurements of Drop Sizes by the Diffraction Method and Liquid Phase Fraction by the Attenuation Method of Light", "subitem_title_language": "en"}]}, "item_type_id": "3", "owner": "1", "path": ["1893", "1917"], "permalink_uri": "https://jaxa.repo.nii.ac.jp/records/45146", "pubdate": {"attribute_name": "公開日", "attribute_value": "2015-03-26"}, "publish_date": "2015-03-26", "publish_status": "0", "recid": "45146", "relation": {}, "relation_version_is_last": true, "title": ["PNEUMATIC ATOMISATION WITH COAXIAL INJECTORS : Measurements of Drop Sizes by the Diffraction Method and Liquid Phase Fraction by the Attenuation Method of Light"], "weko_shared_id": -1}
PNEUMATIC ATOMISATION WITH COAXIAL INJECTORS : Measurements of Drop Sizes by the Diffraction Method and Liquid Phase Fraction by the Attenuation Method of Light
https://jaxa.repo.nii.ac.jp/records/45146
https://jaxa.repo.nii.ac.jp/records/451464d3cacda-5f57-46d1-b02d-f83338f31e5f
名前 / ファイル | ライセンス | アクション |
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naltr0888t.pdf (3.7 MB)
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Item type | テクニカルレポート / Technical Report(1) | |||||
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公開日 | 2015-03-26 | |||||
タイトル | ||||||
言語 | en | |||||
タイトル | PNEUMATIC ATOMISATION WITH COAXIAL INJECTORS : Measurements of Drop Sizes by the Diffraction Method and Liquid Phase Fraction by the Attenuation Method of Light | |||||
言語 | ||||||
言語 | eng | |||||
資源タイプ | ||||||
資源タイプ識別子 | http://purl.org/coar/resource_type/c_18gh | |||||
資源タイプ | technical report | |||||
著者 |
五味, 広美
× 五味, 広美× GOMI, Hiromi |
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著者所属 | ||||||
航空宇宙技術研究所 | ||||||
著者所属(英) | ||||||
en | ||||||
National Aerospace Laboratory(NAL) | ||||||
出版者 | ||||||
出版者 | 航空宇宙技術研究所 | |||||
出版者(英) | ||||||
出版者 | National Aerospace Laboratory(NAL) | |||||
書誌情報 |
en : Technical Report of National Aerospace Laboratory TR-888T 巻 888T, p. 51, 発行日 1985-11 |
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抄録 | ||||||
内容記述タイプ | Abstract | |||||
内容記述 | ロケットエンジン内の液体酸素/水素の微粒化を模擬する為に,同軸型噴射器(同芯型平行流れ二流体噴霧器)により水/空気と水/ヘリウムの噴霧を作り実験を行なった。液滴径はMalvern InstrumentsのST-2200を使い回折法により測定し,噴射器の寸法効果,気体密度の影響を調べた。また,液相の空間分布を光減衰法によって測定した。信頼性の高い測定結果を得る基準“光の透過率は50%以上”を受けた為,水の噴射流量は10g/s以下に制限され,実用的な大きさの噴射器を使った混合比(imjection)ml/(imjection)mg=5付近(液体酸素/水素ロケット・エンジンの一般的な設計点)の測定は不可能になった。実験は主として液噴口径1mmの噴射器を使い混合比3以下で行なった。液滴径は噴射器及び噴霧中心軸からの距離と伴に増加した。噴霧中心軸上の粒子径は気体噴射速度が大きい時極大になり,小さい時最小になった。粒子径分布の最小径を5.8μmとして計算したSDMとMMDの比は0.8±0.1となった。微粒化の理論から予測される様に,液滴径は液噴射速度が一定の場合気体噴射速度の2乗にほぼ逆比例し,主として気体噴流動圧によって決まった。筆者は微粒化の領域を混合比によって次の3つに分けることを提案し,(1) (imjection)ml/(imjection)mg < 0.2 気液相対速度によって液滴径が決定する領域,(2) 0.2 < (imjection)ml/(imjection)mg < 1 気液相対速度と混合比によって液滴径が決定する領域,(3) 1 < (imjection)ml/(imjection)mg 多くのパラメータが粒子径に影響を与える領域,この区分は微粒化距離と円環気体噴流の”ポテンシャル・コア”の長さの比によるものと考えています。 | |||||
抄録(英) | ||||||
内容記述タイプ | Other | |||||
内容記述 | Sprays, formed by coaxial injectors with water/air and water/helium to model liquid oxygen/hydrogen atomisation in a rocket engine, were measured by a Malvern Instruments ST-2200 Particle Size Meter. A criterion that the transmittance of light be more than 50% for a reliable measurement restricted water injection flow rates to less than 10g/s. Bi-modal distribution of diffracted light energy also impeded measurements at high ingection mass ratios of liquid to gas((imjection)ml/(imjection)mg). The drop sizes increased with the distance from the injectors and spray axis. The drop sizes on the spray axis had their local maximum with a high injection gas velocity and their minimum with a low injection gas velocity. The minimum dorp size of Dp,min =5.8μm used in the drop size distribution gave ratios of the Sauter mean diameter to the mass median diameter consistent with other studies. The writer tentatively proposes three regimes of atomisation : (1) (imjection)ml/(imjection)mg < 0.2 where the relative velocity between liquid and gas determines drops sizes, (2) 0.2 < (imjection)ml/(imjection)mg < 1 where the relative velocity and (imjection)ml/(imjection)mg determine drops sizes, (3) 1 < (imjection)ml/(imjection)mg where many parameters affect drop sizes, and assumes that the regimes fo atomisation depend on the length of the atomising region relative to the “potential core” length of the annular gas jet. | |||||
ISSN | ||||||
収録物識別子タイプ | ISSN | |||||
収録物識別子 | 0389-4010 | |||||
資料番号 | ||||||
内容記述タイプ | Other | |||||
内容記述 | 資料番号: NALTR0888000 | |||||
レポート番号 | ||||||
内容記述タイプ | Other | |||||
内容記述 | レポート番号: NAL TR-888T |