@techreport{oai:jaxa.repo.nii.ac.jp:00002564,
 author = {南里, 秀明 and 谷, 直樹 and 河南, 広紀 and 吉田, 義樹 and Nanri, Hideaki and Tani, Naoki and Kannan, Hiroki and Yoshida, Yoshiki},
 month = {Jan},
 note = {In 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., 形態: カラー図版あり, Physical characteristics: Original contains color illustrations, 資料番号: AA0064837000, レポート番号: JAXA-RM-10-014},
 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},
 year = {2011}
}