타이틀 |
Suppression of Super-synchronous Vibration of the LE-7 LOX Pump Inducer |
저자 |
Mitsuo WATANABE, Satoshi HASEGAWA, Yoshiaki WATANABE, Tomoyuki HASHIMOTO, Makoto YOSHIDA, Hitoshi YAMADA |
Keyword |
Rocket; H-II; LE-7 Turbopump; Inducer; Non-Synchronous Vibration; Rotating Cavitation |
URL |
http://send.nal.go.jp/send/jpn/dlpdf.php3/naltr0001359.pdf?id=NALTR0001359 |
보고서번호 |
NAL TR-1359 |
발행년도 |
1998.7 |
출처 |
NAL (National Aerospace Laboratory of Japan) |
ABSTRACT |
During development of the liquid oxygen turbopump of the LE-7 engine, super-synchronousshaft vibrations with a frequency of about 1.0~1.2 times that of the turbopump shaft rotational speed were often observed as the pump inletpressure decreased. From the investigations of the cavitating inducer, it was shown thatthose super-synchronous vibrations were caused by rotating cavitation and it deeply related with tip cavitation in the inducer. Cavitation tests of tCenter. Results of these tests showed that an inducer inlet suction ring with moderately ncreased diameter of the inducer inlet was most effective to suppress rotating cavitation and it was also shown that the inducer delivery pressure did not change even when the cavitation number decreased. |