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titleターボポンプ単体試験で発生した共鳴キャビテーションサージの一次元安定解析による検討
Other TitleStudy of Acoustic Cavitation Surge in a Turbopump using One-dimensional Instability Analyses
Author(jpn)南里, 秀明; 谷, 直樹; 河南, 広紀; 吉田, 義樹
Author(eng)Nanri, Hideaki; Tani, Naoki; Kannan, Hiroki; Yoshida, Yoshiki
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; 宇宙航空研究開発機構情報・計算工学センター; 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; 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
Author Affiliation(eng)Space Transportation Propulsion Research and Development Center, Space Transportation Mission Directorate, Japan Aerospace Exploration Agency (JAXA); JAXA's Engineering Degital Innovation Center, Japan Aerospace Exploration Agency (JAXA)(JEDI); 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)
Issue Date2011-01-31
PublisherJapan Aerospace Exploration Agency (JAXA)
宇宙航空研究開発機構
Publication titleJAXA research and development memorandum
宇宙航空研究開発機構研究開発資料
VolumeJAXA-RM-10-014
Publication date2011-01-31
Languagejpn
eng
AbstractIn a liquid rocket engine, cavitation in an inducer of a turbopump sometimes causes instability phenomena when the inducer is operated at low inlet pressure. Cavitation surge (auto-oscillation), one such instability phenomenon, has been discussed mainly based on an inertia model assuming incompressible flow. When the inertia model is used, the frequency of the cavitation surge decreases continuously as the inlet pressure of the turbopump decreases. However, we obtained interesting experimental result in which the frequency of cavitation surge varied discontinuously. Therefore, we employed one-dimensional instability analysis based on an acoustic model in which the fluid is assumed to be compressible. Then, the analytical result qualitatively corresponded with the experimental result. Using the analytical model, we investigated the effect of a phase lag/lead of unsteady cavitation characteristics on cavitation surge. The phase lag/lead of cavitation compliance was found to strongly affect the instability of cavitation surge, even though the phase of the mass flow gain factor does not so. An actual liquid rocket propulsion system is usually equipping a POGO suppression device (PSD), then, we installed the PSD in the test facility and acquired data. Furthermore, we modified the analytical model to evaluate the effect of the PSD. The frequency of cavitation surge was found to basically become the Helmholtz frequency, calculated with the cavitation compliance and the length of pipeline between the PSD and the turbopump. When the frequency of cavitation surge matches one of the acoustic resonance frequency of inlet pipeline, the cavitation surge is strongly excited. The agreement between the experimental result and the analytical result is fairly good.
DescriptionOriginal contains color illustrations
形態: カラー図版あり
KeywordsCavitation; Surging; Inducer; Stability; Acoustic Resonance; Accumurator
Document TypeTechnical Report
JAXA Category研究開発資料
ISSN1349-1121
NCIDAA11983593
SHI-NOAA0064837000
Report NoJAXA-RM-10-014
URIhttps://repository.exst.jaxa.jp/dspace/handle/a-is/21236


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