국내 최대 기계 및 로봇 연구정보

기술보고서

기술보고서 게시판 내용
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.