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63533000.pdf2.24 MB
title熱力学的効果が同期旋回キャビテーションに与える影響
Other TitleInfluence of thermodynamic effect on synchronous rotating cavitation
Author(jpn)吉田 義樹; 笹尾 好史; 沖田 耕一; 長谷川 敏; 橋本 知之; 井小萩 利明
Author(eng)Yoshida, Yoshiki; Sasao, Yoshifumi; Okita, Koichi; Hasegawa, Satoshi; Hashimoto, Tomoyuki; Ikohagi, Toshiaki
Author Affiliation(jpn)宇宙航空研究開発機構 総合技術研究本部 角田宇宙センター; 宇宙航空研究開発機構; 宇宙航空研究開発機構 宇宙基幹システム本部; 宇宙航空研究開発機構 総合技術研究本部 角田宇宙センター; 宇宙航空研究開発機構 総合技術研究本部 角田宇宙センター; 東北大学流体科学研究所
Author Affiliation(eng)Japan Aerospace Exploration Agency Kakuda Space Center, Institute of Aerospace Technology; Japan Aerospace Exploration Agency; Japan Aerospace Exploration Agency Office of Space Flight and Operations; Japan Aerospace Exploration Agency Kakuda Space Center, Institute of Aerospace Technology; Japan Aerospace Exploration Agency Kakuda Space Center, Institute of Aerospace Technology; Institute of Fluid Science, Tohoku University
Issue Date2007-09-28
PublisherJapan Aerospace Exploration Agency (JAXA)
宇宙航空研究開発機構
Publication date2007-09-28
Languagejpn
AbstractSynchronous rotating cavitation is one type of cavitation instability, causing synchronous shaft vibration or head loss. On the other hand, cavitation in cryogenic fluids has a thermodynamic effect on cavitating inducers because of thermal imbalance around the cavity. To investigate the influence of the thermodynamic effect on synchronous rotating cavitation, we conducted experiments in which liquid nitrogen was set at different temperatures (74 K, 78 K and 83 K). We clarified the thermodynamic effect on synchronous rotating cavitation in terms of cavity length, fluid force, and liquid temperature. Synchronous rotating cavitation occurs at the critical cavity length of L(sub c)/h = 0.8, and the onset cavitation number shifts to a lower level due to the suppression of cavity growth by the thermodynamic effect, the influence of which becomes more significant with rising liquid temperature. Furthermore, we confirmed that the fluid force acting on the inducer increases markedly under conditions of synchronous rotating cavitation.
DescriptionJAXA Research and Development Report
宇宙航空研究開発機構研究開発報告
Keywordsthermodynamics; rotating cavitation; cavitation instability; helical inducer; cryogenic temperature; cryogenic fluid; temperature dependence; liquid nitrogen; structural vibration; shaft vibration; 熱力学; 旋回キャビテーション; キャビテーション不安定性; ヘリカルインデューサ; 極低温; 極低温流体; 温度依存性; 液体窒素; 構造振動; 軸振動
Document TypeTechnical Report
JAXA Category研究開発報告
ISSN1349-1113
SHI-NOAA0063533000
Report NoJAXA-RR-07-003
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/52214


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