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65513000.pdf5.27 MB
titleEffect of Thermodynamic Parameter on Cavitation in Rocket Inducer
Other Titleロケット用インデュ-サのキャビテ-ションに与える熱力学的パラメ-タの影響
Author(jpn)吉田, 義樹; 菊田, 研吾; 新井山, 一樹; 渡邉, 聡
Author(eng)Yoshida, Yoshiki; Kikuta, Kengo; Niiyama, Kazuki; Watanabe, Satoshi
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(JAXA); 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 (JAXA) : IHI航空宇宙事業本部; 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 (JAXA) : 金沢工業大学工学部; 九州大学大学院工学研究院
Author Affiliation(eng)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, Japan Aerospace Exploration Agency (JAXA) : Aero-Engine & Space Operations, IHI; Space Transportation Propulsion Research and Development Center, Space Transportation Mission Directorate, Japan Aerospace Exploration Agency (JAXA) : Department of Mechanical Engineering, Kanazawa Institute of Technology; Department of Mechanical Engineering, Kyushu University
Issue Date2013-01-31
Publisher宇宙航空研究開発機構(JAXA)
Japan Aerospace Exploration Agency (JAXA)
Publication title宇宙航空研究開発機構研究開発資料
JAXA Rresearch and Development Memorandum
VolumeJAXA-RM-12-006E
Start page1
End page35
Publication date2013-01-31
Languageeng
AbstractCavitation is physically "a vaporization of liquid" which needs latent heat for phase change. A cavity grows in the liquid, so the latent heat of vaporization can only be supplied by the liquid surrounding the cavity. Thus, the liquid close to the interface region of the cavity is cooled down. || In general, cryogenic liquids are very thermosensitive. For liquid hydrogen and oxygen used in rocket propulsion, the temperature in the cavity, i.e., the vapor pressure in the cavity, is lower than those of the liquid bulk. Thanks to this thermal effect, cavitation in cryogenic liquids is less developed than that in water at room temperature. This thermal effect on cavitation is beneficial in that it improves cavitation performance and alleviates cavitation instabilities in space inducers. || In previous works, we investigated the relationship between the thermodynamic effect and the cavitation instabilities, e.g., rotating cavitation and cavitation surge, with a focus on the cavity length as an indication of cavitation. In the present work, first, aspects of cavitation in an inducer were observed by direct optical visualization in liquid nitrogen. Second, joint experiments in liquid nitrogen and cold water were conducted on a cavitaing inducer. In nitrogen experiments, operating conditions, i.e., rotational speed and liquid temperature, were varied to determine the cavitation scaling law. Through these experimental results, characteristic times, namely, the transit time for bubble growth and the characteristic thermal time introduced from the thermal property, were investigated as a cavitation thermodynamic parameter. It was found out that the adjustment of cavitation number has a good correlation with the ratio of the transit time and the characteristic thermal time.
Description形態: カラー図版あり
Physical characteristics: Original contains color illustrations
Document TypeTechnical Report
JAXA Category研究開発資料
ISSN1349-1121
NCIDAA11983593
SHI-NOAA0065513000
Report NoJAXA-RM-12-006E
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/19721


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