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titleインデューサに発生する旋回キャビテーションの熱力学的効果
Other TitleThermodynamic effect on rotating cavitation in an inducer
Author(jpn)吉田 義樹; 笹尾 好史; 渡邉 光男; 橋本 知之; 伊賀 由佳; 井小萩 利明
Author(eng)Yoshida, Yoshiki; Sasao, Yoshifumi; Watanabe, Mitsuo; Hashimoto, Tomoyuki; Iga, Yuka; Ikohagi, Toshiaki
Author Affiliation(jpn)宇宙航空研究開発機構 宇宙輸送ミッション本部 宇宙輸送系推進技術研究開発センター; 東北大学流体科学研究所; 宇宙航空研究開発機構 宇宙輸送ミッション本部 宇宙輸送系推進技術研究開発センター; 宇宙航空研究開発機構 宇宙輸送ミッション本部 宇宙輸送系推進技術研究開発センター; 東北大学流体科学研究所; 東北大学流体科学研究所
Author Affiliation(eng)Japan Aerospace Exploration Agency (JAXA) Space Transportation Propulsion Research and Development Center, Space Transportation Mission Directorate; Institute of Fluid Science, Tohoku University; Japan Aerospace Exploration Agency (JAXA) Space Transportation Propulsion Research and Development Center, Space Transportation Mission Directorate; Japan Aerospace Exploration Agency (JAXA) Space Transportation Propulsion Research and Development Center, Space Transportation Mission Directorate; Institute of Fluid Science, Tohoku University; Institute of Fluid Science, Tohoku University
Issue Date2008-11-14
PublisherJapan Aerospace Exploration Agency (JAXA)
宇宙航空研究開発機構
Publication date2008-11-14
Languagejpn
AbstractRotating cavitation in inducers is known as one type of cavitation instability, in which an uneven cavity pattern propagates in the same direction as the rotor with a propagating speed ratio of 1.0-1.2. On the other hand, cavitation in cryogenic fluids has a thermodynamic effect because of the thermal imbalance around the cavity. To investigate the influence of the thermodynamic effect on rotating cavitation, we conducted experiments in which liquid nitrogen was set at different temperatures (74 K, 78 K and 83 K) with a focus on the cavity length. At higher cavitation numbers, super-synchronous rotating cavitation occurred at the critical cavity length of Lc/h approximately equal to 0.5 with a weak thermodynamic effect in terms of the fluctuation of cavity length. In contrast, synchronous rotating cavitation occurred at the critical cavity length of Lc/h approximately equal to 0.9-1.0 with a strong thermodynamic effect in terms of the unevenness of cavity length. Furthermore, we confirmed that the amplitude of the shaft vibration depended on the degree of the unevenness of the cavity length through the thermodynamic effect.
DescriptionJAXA Research and Development Memorandum
宇宙航空研究開発機構研究開発資料
Keywordscavitation; liquid propellant rocket engine; helical inducer; cavity length; thermodynamic property; liquid rocket propellant; cryogenic fluid; vapor pressure; flow stability; キャビテーション; 液体燃料ロケットエンジン; ヘリカルインデューサ; キャビティ長さ; 熱力学的性質; 液体ロケット推進薬; 極低温流体; 蒸気圧; 流れの安定性
Document TypeTechnical Report
JAXA Category研究開発資料
ISSN1349-1121
SHI-NOAA0064094000
Report NoJAXA-RM-08-004
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/54960


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