@techreport{oai:jaxa.repo.nii.ac.jp:00044982,
 author = {志村, 隆 and 上條, 謙二郎 and SHIMURA, Takashi and KAMIJO, Kenjiro},
 month = {Aug},
 note = {It is common for turbopumps of rockets to be operated in low NPSH conditions. Therefore, oscillation of propellant feed systems associated with cavitation is often encountered. In the present study, one aspect of the unsteady and dynamic characteristics of liquid oxygen pumps was examined by using power spectral methods and calculation of the feed systems. Three similar types of pumps, that is, single stage centrifugal pumps with inducers, were examined. One of them was made for the developmental study of a LOX/LH2 engine(LE-5). The major results of the present study were as follows: 1.The flow compliance was an important factor in causing the systems to be unstable. And the cavitation compliance was an important factor influencing the frequency of the unsteady low cycle oscillation, though in contrast to the flow compliance, it contributed to system stability. 2.The flow measurement confirmed that the low cycle oscillation was equivalent to the system oscillation accompanied by flow oscillation. 3.Besides the cavitation parameter and the flow rate, the pump inlet pressure level seemed to have affected the frequency of the low cycle oscillation. 4.With the reduction of the cavitation parameter, the frequency of 100 HZ level oscillation decreased. Also, smaller tip clearance of the inducer caused greater oscillation. 5.The pump outlet pressure oscillation, the frequency of which corresponded to the product of the pump rotating speed and the number of the main impeller blades, almost disappeared when the clearance between the main impeller outlet and the volute cut water was increased. 6.The results mentioned above were used to design the liquid oxygen pump of the LE-5 engine, and the pump showed a good dynamic performance., 資料番号: NALTR0725000, レポート番号: NAL TR-725},
 title = {ロケット用液酸ポンプの動特性の研究(その1)},
 year = {1982}
}